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ELECTRIC FURNACES BULLETIN

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ELECTRIC FURNACES BULLETIN Powered By Docstoc
					                                                                         E LECTRIC F URNACES

                                                                                       ELECTRIC OVENS




                                                                                   KETTLES & MELTERS




         Designing and Manufacturing Electrically Heated Process
                                                                          F&F ® HEATING ELEMENTS & RACKS
                        Equipment SINCE 1927




                ELECTRIC FURNACES                                                        PLUG HEATERS

                     BULLETIN
                                                                                    ELECTRIC JACKETS




                                                                                   IMMERSION HEATERS
                          HL SERIES
                          FURNACE

                                                                                      FINTUBE HEATERS




                                                                                        STRIP HEATERS




                                                                          CONVEYOR OVENS & FURNACES




                                                                                   CARTRIDGE HEATERS
                                        H Series Box Furnace




                                                                                     TUBULAR HEATERS




                                                                                            HOT PLATES
            201 Leverington Avenue, Philadelphia, PA 19127

 Toll Free: 800.544.TRENT                           Fax: 215.482.9389
 Website: www.trentheat.com                  E-mail: trentheat@aol.com
                                                                                CERAMIC RING HEATERS


7-2005                                                                                      Bulletin - 20
                                                                        201 Leverington Avenue
                                                                         Philadelphia, PA 19127
                     TABLE OF CONTENTS                                  Phone: 215.482.5000
                                                                        Fax:      215.482.9389
                                                                      Website: www.trentheat.com
                                                                      E-mail:   trentheat@ aol.com



                                                                 PAGE
         TRENT ELECTRIC FURNACES -
               A History of Outstanding Quality                   2
               Basic Electric Furnace Design                      2
               Heating Element Selection                          2
               Advantages of TRENT Folded and Formed®
                  Heating Elements                                2
               Furnace Control                                    3

         LABORATORY FURNACES -
              Horizontal Tubular Furnaces
                  LFH Series - 2000°F (1093°C)                    4
              Pit or Crucible Furnaces
                  LFV Series - 2000°F (1093°C)                    5
              Bench Type Box Furnaces
                  M2-DKR Series - 2500°F (1371°C)                 6
                  HL Series - 2000°F (1093°C)                     7

         POT FURNACES -
                 PF Series - 1400°F (760°C)                       8
                 Trough Furnace TFL/TF Series - 1700°F (927°C)    9

         PIT FURNACES -
                Radiant Heat
                   PT Series - 1850°F (1010°C)                    10
                   VR Series - 2000°F (1093°C)                    11
                Vertical Air Recirculation - Top to Bottom
                   M2-CAH Series - 1400°F (760°C)                 12

         BELL FURNACES -
                 BA Series - 1850°F (1010°C)                      13

         BOX FURNACES -
               Radiant Heat
                  H Series - 1850°F (1010°C)                      14
                  HM Series (Muffle Design) - 1900°F (1038°C)     15
               Horizontal Air Recirculation - Front to Back
                  GF Series - 1400°F (760°C)                      16
                  GFH Series (Muffle design) - 1750°F (954°C)     17
               High Temperature Box Furnaces
                  SCR Series - 2500°F (1371°C)                    18

         FURNACE QUOTATION QUESTIONNAIRE




7-2005                                    - i -                                        Bulletin - 20
                                                                                                                 201 Leverington Avenue
                                                  TRENT ELECTRIC                                                  Philadelphia, PA 19127
                                                                                                                 Phone: 215.482.5000
                                                    FURNACES                                                     Fax:      215.482.9389
                                                                                                               Website: www.trentheat.com
                                                                                                               E-mail:   trentheat@ aol.com


            A HISTORY OF OUTSTANDING QUALITY                              There are three basic types: round rod; flat ribbon; and formed
                                                                          or curved ribbon types, all shown in Fig.1.
Since 1927, TRENT, Incorporated has been one of the pioneers
in electrically heated industrial equipment. All TRENT furnaces           The Rod type has excellent rigidity due to the physical construc-
and ovens have been carefully engineered, and tested to meet the          tion, but requires refractory backing plates to dissipate the heat
stringent requirements of industrial and governmental customers.          from the element so its effective radiating surface can be
The company’s expertise has been focused exclusively on electri-          increased.
cally heated equipment and at no time has combustion equipment
been built. The value of nearly eight decades of such experience          The standard Flat Ribbon has a good radiating surface, but needs
cannot be underestimated.                                                 considerable thickness for support. Both the rod and the standard
                                                                          flat ribbon type elements require auxiliary spacers between turns
The heat treatment of metals and other materials is a precise             to prevent creep and springing. These spacers limit the unit cov-
process, and requires the proper heat treating equipment to               erage per square foot of area. It is usually necessary to have a rel-
achieve uniform results consistently.                                     atively heavy cross section in the above units to give the required
                                                                          rigidity. Electrical resistance is naturally lower in the above types
             BASIC ELECTRIC FURNACE DESIGN                                of elements requiring costly voltage reducing transformers for both

There are three basic types of electric furnaces: Box type for
hardening; Air Circulation Type, for annealing or drawing; and
Salt Bath for carburizing, hardening and tempering.                                                                 1"                     .0159"
                                                                                                              FLAT RIBBON
                                                                              One linear inch of ribbon
The some of the advantages electrically heated furnaces have                   A or B has 2 sq, inches             A
over combustion type furnaces are as follows:                                    of radiating surface

                                                                                                                                  .25"
1.   Temperature uniformity in the furnace results in greater uni-
        formity of products.
                                                                                                                .637"
                                                                                                           FORMED RIBBON
2.   Closer control makes possible very accurate duplication of
                                                                                                                   B
         results.

3.   Absence of combustion products results in superior quality in             One linear inch of rod C
                                                                                                                              .142" DIA.
                                                                               has 0.446 sq, inches of
        many processes.                                                           radiating surface
                                                                                                          ROD OF SAME CROSS
4.   Maintenance costs are lower with shorter production shut-                                              SECTIONAL AREA
         down periods.                                                                                            C

5.   Greater flexibility of the electric furnace permits more efficient
         use of various operations.
                                                                                                                 FIG.
                                                                                                               FIG.12
                                                                          small and medium size furnaces.
                                   Since electric furnaces are clean
                                   and well insulated, many heat          The FOLDED and FORMED® heating element, developed and
                                   treating operations can be car-        created by TRENT, Inc., are made from flat ribbon, folded into
                                   ried out in the machine shop,          return bends and then formed or curved to give physical rigidity.
                                   tool room, or in the production        They are supported in position inside the furnace by refractory
TRENT Folded and Formed®           line, where combustion furnaces        porcelains which are keyed and mounted to the brick chamber
    Heating Elements               might not be satisfactory.             liner as shown in Fig. 2.

The fundamental engineering principles of TRENT furnaces and              The multiple row design of TRENT FOLDED and Formed® heat-
ovens are the same today as they were in the early units. This            ing elements permits selective replacements for lower mainte-
includes the compact design, and TRENT’s innovative Folded                nance costs and shorter production down time.
and Formed® (F&F®) metallic resistor heating element design,
which are incorporated in most of the TRENT furnaces.                               ADVANTAGES OF TRENT FOLDED & FORMED®
                                                                                              HEATING ELEMENTS
                HEATING ELEMENT SELECTION
                                                                          The advantage of rod type elements is strength. The advantage
The heart of an electric furnace is the heating elements, and in          of flat ribbon is its greater surface area for use in dissipating heat
selecting the type and form of heating elements, careful consider-        generated without backing plates.
ation must be given to construction and shape.
                                                                          Through the process of forming flat ribbon, the FOLDED and


7-2005                                                                - 2 -                                                                Bulletin - 20
                                                                                                              201 Leverington Avenue
                                                  TRENT ELECTRIC                                               Philadelphia, PA 19127
                                                                                                               Phone: 215.482.5000
                                                    FURNACES                                                  Fax:      215.482.9389
                                                                                                            Website: www.trentheat.com
                                                                                                            E-mail:   trentheat@ aol.com


FORMED® element develops a strength found greater than rod by
test, because of greater cross sectional inertia.

Since F&F® heating elements is made from flat ribbon, it has the
greater radiating area of flat ribbon, hence this element offers both
major advantages of its counterparts.

As mentioned before, a ribbon type element has a greater surface
area for a given cross section than a rod type, and the TRENT
FOLDED and FORMED® element has this advantage combined
with the added support feature.

The conventional ribbon type element is generally mounted edge-
wise against the furnace wall with the strands close together
resulting in inner radiation which raises the temperature of the ele-
ment. The TRENT F&F® element, on the other hand, is folded so
that the concave side of the ribbon is facing the furnace charge.
This allows the heat to get away from the unit, lowers the unit tem-
perature, and thus increases unit life.                                                                   FIG.3
As shown in Figure 1, the FOLDED AND FORMED® element is                 given wattage and more rigid than the rod type due to a special
only a fraction of the thickness of rod type furnace elements, but      forming operation shown in Fig. 1[B]. It can be readily seen that
is formed to give even greater strength. This thinner cross section     this unit has advantages over both the rod element and the stan-
of the element raises the resistance of the circuit and permits the     dard flat ribbon element. Auxiliary backing refractory porcelain
operation of most furnaces directly on line voltage, thus eliminat-     plates are not necessary, and the resulting heat lag is eliminated.
ing costly transformer.                                                 When a heating element of the ribbon type or rod type is over
                                                                        .0625“ in thickness or diameter, the temperature gradient between
The TRENT F&F® element is fabricated from wrought alloy having          the surface of the element and the inside becomes appreciable.
a composition of 80% nickel and 20% chrome with less than 1%            This condition will accelerate burn-outs should the element be
iron as an impurity. This has long been recognized by furnace           operated at too high a temperature for a long period of time. In
manufacturers as the best alloy used in electric furnaces for sus-      comparing a standard ribbon 1” wide x .0159” thick as shown in
tained temperatures of 1850°F or for short periods up to 2000°F.        Fig. 1[A] to a rod of the same cross sectional area (Fig. 1[C])
                                                                        results in a rod diameter of .142”; the rod is nine times thicker than
                                                                        the ribbon and has less than one-fourth of the radiating area.

                                                                        When FOLDED and FORMED® ribbon is made by the TRENT
                                                                        method, it has greater strength than either the rod or the flat rib-
                                                                        bon unit, and is strong enough to be self-supporting. The greater
                                                                        surface area obtained with a formed ribbon element will give bet-
                                                                        ter heat transfer from the unit to the surrounding air by convection,
                                                                        conduction, and radiation, without the aid of special refractory plat-
                                                                        ed or backing plates.

                                                                        FIG 3 shows typical sections of F&F® heating elements support-
                                                                        ed against the lining of the furnace chamber by H shaped refrac-
                                                                        tory porcelains. This example also shows that, when the heat is
                                                                        not radiated directly to the work in the furnace, the element heats
                                                                        the surface of the firebrick insulation, which, in turn, radiates the
                                                                        heat onto the workload, creating a uniform blanket of heat on all
                                                                        walls.
         Fig. 2
                                                                        FURNACE CONTROL

This unit is manufactured from standard ribbons using thickness-        A control system must be selected based on the requirements of
es between fifteen and thirty thousands of an inch, permitting the      the process. Anything from a basic cost effective on/off control to
unit to be light in weight, and resulting in reduced furnace heat-up    a SCR package, which has been proven to be efficient and effec-
time.                                                                   tive, can be provided to meet your needs.

The FOLDED AND FORMED® units are lighter in weight for any


7-2005                                                              - 3 -                                                       Bulletin - 20
                                                                                                                    201 Leverington Avenue
                                                      LABORATORY                                                     Philadelphia, PA 19127
                                                                                                                    Phone: 215.482.5000
                                                       FURNACES                                                     Fax:      215.482.9389
                                                                                                                  Website: www.trentheat.com
                                                                                                                  E-mail:   trentheat@ aol.com

                                                                                                              Brick
                                                                                                            Insulation
HORIZONTAL TUBULAR FURNACES                                                                                           Powder Type
                                                                                                                                    Coiled Heating
                                                                                                                                       Element
                                                                                              Heating
LFH Series --- 2000°F (1093)°C Max.                                          Ceramic Core     Element                  Insulation



TRENT Horizontal Tubular Furnaces are used for carbon determi-
nation in steel and other combustion analysis. The furnace has a
refractory tube with a helical heating element coil and is well insulat-
ed. The ends of the furnace are made of insulating brick, firmly held
in position by a steel casing. The outer casing is carbon steel and so
arranged that the distance from the center of the furnace to the base
is 10”.

Temperature is controlled by a manually set rheostat so the temper-                     Work                             Terminal Block
                                                                                       Chamber
                                                                                                        Ceramic Core
ature can be held at the desired level.. Automatic controls are avail-
able.                                                                                       Schematic View --- Cutaway Section
                                                                                                    LFH Oven Series


STANDARD FEATURES:
§    Standard parts requiring little or no maintenance.
§    Insulated with fire brick and powder type.
§    Rugged construction for industrial applications.
§    Openings at one or both ends if desired.
§    Carbon steel outer casing.
§    Long life helical coil heating elements wound around                                                        LFH-236 Series
        and cemented to a horizontal alundum core chamber.                                                       Tubular Furnace

OPTIONS:

§   Fused safety disconnect switch and          LFH Series --- Standard Sizes --- 2000°F (1093°C) Maximum
        control instruments as required.                                                       Chamber Size                     Outside
§   Standard NEMA and UL listed
                                                    Type          Watts         Volts*       Diameter Length             W        H           D†
        switchgear and control panel for
                                                 LFH-112             550        120/240        1-¼"         12"      9-¼"      14-9/16"     15-1/8"
        remote mounting by user.                 LFH-118             825        120/240        1-¼"         18"      9-¼"      14-9/16"     21-1/8"
§   Control instruments as required.             LFH-124            1100        120/240        1-¼"         24"      9-¼"      14-9/16"     27-1/8"
§   Thermocouple mounted to the furnace          LFH-136            1650        120/240        1-¼"         36"      9-¼"      14-9/16"     39-1/8"
        exterior with sensing probe              LFH-212            1200        120/240          2"         12"      9-¼"      14-9/16"     15-1/8"
        entering the chamber trough the          LFH-218            1800        120/240          2"         18"      9-¼"      14-9/16"     21-1/8"
        insulation and ceramic core.             LFH-224            2400        120/240          2"         24"      9-¼"      14-9/16"     27-1/8"
                                                 LFH-236            3600        120/240          2"         36"      9-¼"      14-9/16"     39-1/8"
                                                 LFH-312            1500        120/240          3"         12"      9-¼"      14-9/16"     15-1/8"
                                                 LFH-318            2250        120/240          3"         18"      9-¼"      14-9/16"     21-1/8"
                                                 LFH-324            3000        120/240          3"         24"      9-¼"      14-9/16"     27-1/8"
                                                 LFH-336            3750        120/240          3"         36"      9-¼"      14-9/16"     39-1/8"
                                                 LFH-424            3600        120/240          4"         24"     11-¼"      16-9/16"     27-1/8"
                                                 LFH-436            5400        120/240          4"         36"     11-¼"      16-9/16"     39-1/8"
                                                 LFH-524            4500        120/240          5"         24"     12-¼"      17-9/16"     27-1/8"
                                                 LFH-536            6700        120/240          5"         36"     12-¼"      17-9/16"     39-1/8"
                                                 LFH-624            5400        120/240          6"         24"     13-¼"      18-9/16"     27-1/8"
                                                 LFH-636            8100        120/240          6"         36"     13-¼"      18-9/16"     39-1/8"
                                                 LFH-648           10800        120/240          6"         48"     13-¼"      18-9/16"     51-1/8"
                                                * Voltages listed are not dual voltages. All furnaces are single-phase service



7-2005                                                               - 4 -                                                            Bulletin - 20
                                                                                                                    201 Leverington Avenue
                                                      LABORATORY                                                     Philadelphia, PA 19127
                                                                                                                    Phone: 215.482.5000
                                                       FURNACES                                                     Fax:      215.482.9389
                                                                                                                  Website: www.trentheat.com
                                                                                                                  E-mail:   trentheat@ aol.com


TRENT laboratory furnaces are small bench or stand type intermittent duty furnaces. Small quantities of materials may be processed
in these furnaces, but they are primarily used for pilot or test operations. The furnaces are designed to operate under natural atmos-
phere and laboratory conditions, unless specifically modified.                                                                Coiled
                                                                                                                            Brick
                                                                                                                            Cover        Heating
                                                                                                                                         Element
PIT or CRUCIBLE FURNACES ---                                                                                Ceramic
  LFV Series --- 2000°F (1093°C) Max.                                                                        Core



Crucible Furnaces are ideal for heat treating small quantities of mate-
rial, ash determination, melting white metal, and thermocouple calibra-
tion. The outer casing is made of carbon steel. The helically coiled
heating element is wound on a spiral form and cemented in place with
a powder type insulation. The brick cover can be drilled for insertion of
a thermometer or thermocouple.                                                                            Powder
                                                                                                            Type
                                                                                                         Insulation
Temperature is controlled by a manually set rheostat so the temperature
can be held at the desired level.. Automatic controls are available.                Graphite                          Terminal Block        Brick
                                                                                    Crucible                                              Insulation


                                                                                                     LFV Series Furnace


STANDARD FEATURES:                                                       OPTIONS:
§   Standard parts requiring little or no maintenance.                   § Fused safety disconnect switch and control instruments
                                                                               as required.
§   Vertically set alundum core.
                                                                         § Standard NEMA and UL listed switchgear and control
§   Insulated with fire brick and powder type.                                 panel for remote mounting by user.
§   Rugged construction for industrial applications.                     § Control instruments as required.
§   Brick type cover.                                                    §   Thermocouple mounted to the furnace exterior with
§   Carbon steel outer casing. painted with a heat                               sensing probe entering the chamber trough the
        resistant paint.                                                         insulation and ceramic core.
§   Long life helical coil heating elements wound around
        and cemented to a vertically set alundum core
        chamber.
§   Graphite crucible


              LFV Series --- Standard Sizes --- 2000°F (1093°C) Maximum
                                                          Chamber Size               Outside                 Crucible Size
                   Type         Watts        Volts*     Diameter Depth           Diameter Depth            Diameter Depth
                 LFV-3             750          120          3-½"         5"       10-¼"       12-3/8"        2-½"          3"
                 LFV-4             750          240          3-½"         5"       10-¼"       12-3/8"        2-½"          3"
                 LFV-5            1250          120            5"         5"       11-¾"       12-3/8"        3-¼"          4"
                 LFV-6            1250          240            5"         5"       11-¾"       12-3/8"        3-¼"          4"
              * Voltages listed are not dual voltages. All furnaces are single-phase service




7-2005                                                              - 5 -                                                              Bulletin - 20
                                                                                                               201 Leverington Avenue
                                                      LABORATORY                                                Philadelphia, PA 19127
                                                                                                               Phone: 215.482.5000
                                                       FURNACES                                                Fax:      215.482.9389
                                                                                                             Website: www.trentheat.com
                                                                                                             E-mail:   trentheat@ aol.com


BENCH STYLE BOX FURNACES -
Type M2-DKR --- 2500°F (1371)°C Max.                                                                     High Temperature
                                                                                                        Brick and Laminated
                                                                                                             Insulation
The TRENT M2-DKR High Temperature Furnace is designed to operate at                Counterweighted Door
temperatures up to 2500°F. The outer casing is reinforced welded carbon
steel, lined with two grades of laminated, high temperature insulation. The
heating elements are silicon Carbide type resistors located beneath a ceram-
ic hearth plate. These elements are connected in series for 240 volt opera-
tion or used in parallel for 120 volt operation.

The brick-lined furnace chamber reflects heat, radiating it into the charge.
This also aids in maintaining fine temperature distribution throughout the fur-
nace. With the heating elements located beneath the hearth, they are pro-
                                                                                       Terminal Box                      Silicon Carbide Rod
tected against scale and accidental breakage.
                                                                                                                        Type Heating Elements

The door is a counter-weighted, vertical lift type to provide a tight seal with                             Silicon Carbide
the brick lined furnace front.                                                                               Hearth Plate

                                                                                              M2-DKR Type Furnace
The general design is compact and lends well to bench mounting in labora-
tories. An automatic, indicating, controlling type temperature instrument is usually supplied with a magnetic contactor, and platinum
rhodium type thermocouple. The temperature control instrument is usually for remote mounting by the user.

STANDARD FEATURES:                                                       OPTIONS:
§   Standard parts with little or no maintenance required.               §   Fused safety disconnect switch.
§   4-½" of brick backed by 2” of slab type secondary insulation.        §   Standard NEMA and UL listed switchgear and
§   Rugged steel construction for most industrial uses.                         control panel.
§   Silicon carbide type hearth plate.                                   §   Control instruments as required.
§   Vertical lift, counter-weighted door for quick access                §   Special purpose accessories.
         to work chamber.
§   Heating elements are silicon carbide type resistors located
         beneath the hearth plate for long life.
§   Built for bench mounting, without legs.




            M2-DKR Series --- Standard Sizes --- 2500°F (1371°C) Maximum
                                                                              Inside                        Outside
                 Type          kW         Volts*        PH.         W           H           D         W       H               D
              M2-DKR            4.5      120/240         1          8"          5"         14"        25"      31"        38"
             * Dual Voltage furnace.                                         One Size available.




7-2005                                                              - 6 -                                                         Bulletin - 37
                                                   LABORATORY or                                                  201 Leverington Avenue
                                                                                                                   Philadelphia, PA 19127
                                                     TOOL ROOM                                                     Phone: 215.482.5000
                                                                                                                  Fax:      215.482.9389
                                                      FURNACES                                                  Website: www.trentheat.com
                                                                                                                E-mail:   trentheat@ aol.com


BENCH STYLE BOX FURNACES -
Type HL --- 2000°F (1093)°C Max.
TRENT HL TYPE Furnaces is designed to operate at temperatures
up to 2000° and intermittently to 2200°F. The outer casing is rein-
forced welded carbon steel, lined with two laminated layers of high
grade brick and slab type insulation. The heating elements are
                                  ®
TRENT FOLDED and FORMED exposed ribbon type heating ele-
ments, supported by ceramic retainers that are keyed into the brick
lined furnace chamber. The F&F® heating elements are located on
both sides, top and bottom of the furnace chamber. The bottom ele-
ments are located beneath a ceramic hearth plate which protects
them against scale and accidental breakage. These elements are
connected in series for 240 volt operation or used in parallel for 120
                                                                                                 HL SERIES FURNACE
volt operation.

The brick-lined furnace chamber reflects heat, radiating it into the charge. This aids in maintaining fine temperature distribution through-
out the furnace. The door is a hinged, fast-action, over-lapping, plug type to provide a tight seal with the brick lined furnace front.

The general design is compact and lends well to bench mounting in laboratories. An automatic, indicating, controlling type temperature
instrument is usually supplied with a magnetic contactor, and platinum rhodium type thermocouple. The temperature control instrument
is usually for remote mounting by the user.forced through ducts along the sides of the work chamber; Heating elements are located
inside the ducts. After passing over the heating elements, the heated air moves into the work chamber at the front of the oven and again
passes through and over the work load.

STANDARD FEATURES:                                                         OPTIONS:
§   Standard parts with little or no maintenance required.                 §   Silicon carbide muffle with openings at both ends in lieu of
§   Fire brick chamber liner backed by slab type secondary                         the hearth plate.
        insulation.                                                        §   Control thermocouple mounted to the furnace.
§   Rugged steel construction for most industrial uses.                    §   Fused safety disconnect switch.
§   Silicon carbide type hearth plate with side rails.                     §   Standard NEMA and UL listed switchgear and
§   Fast-action, drop down, over-lapping plug type door with                       control panel.
        counterweight.for quick access to work chamber.                    §   Control instruments as required.
§   TRENT Folded and Formed® heating elements supported                    §   Special purpose accessories.
        by ceramic retainers that are keyed into the brick lined
        furnace chamber.
§   Built for bench mounting, without legs.




           HL Series --- Standard Sizes --- 2000°F (1093°C) Maximum †
                                                                               Inside                        Outside
               Type           kW         Volts         PH.          W            H          D         W        H           D
               HL-4           4            240             1        8-¼"       5-¼"       16-¼"      20"      25-½"        29"
               HL-6           16           240             1       11-¼"       8-¼"        24"       28"       37"         39"
            † Furnace can be operated intermittently to 2200°F (1204°C).                Larger Custom Sizes are available.




7-2005                                                               -7-                                                          Bulletin - 20
                                                                                                                    201 Leverington Avenue
                                                                                                                     Philadelphia, PA 19127
                                                           POT TYPE                                                 Phone: 215.482.5000
                                                                                                                    Fax:      215.482.9389
                                                           FURNACES                                               Website: www.trentheat.com
                                                                                                                  E-mail:   trentheat@ aol.com


PF Series --- 1400°F (760°C) Max.
TRENT Pot Furnaces are used in the metal working industry for lead hardening,
case hardening, drawing, tempering, annealing, brazing, pre-heating and car-
bonizing through the use of a wide choice of salts available.

Pot furnaces eliminate the atmosphere problem by excluding it; therefore, scal-
ing, oxidation and de-carbonization are avoided without the necessity of costly
atmosphere equipment. The furnace is designed so that radiant heat is uniform-
ly applied to the outside of the pot. This increases pot life as compared to local-
ized hot spot heating in combustion type furnaces.

The molten bath furnace is considered superior to radiant heat methods by many
experts because it usually gives a faster, more uniform heat application by con-
duction than is possible using radiant heat.                                                 Folded and Formed®               Split Swing Cover on
                                                                                              Heating Elements                    Larger Models

STANDARD FEATURES:
§   Standard parts with little or no maintenance required.
§   Laminated fire brick chamber liner and throat backed by slab        One Piece Lift-off
                                                                        Cover on Smaller
        type secondary insulation.                                          Models
§   All Pots to have flange and skirt with gasket seal to prevent        (NOT SHOWN)
        seepage of the salt into the furnace chamber and are
        constructed of pressed steel, inconel or stainless steel
        with dished or flat bottom depending on furnace size and
        temperature. NOTE: Inconel pots used with neutral salts
        are not guaranteed.
§   TRENT Folded and Formed® heating elements supported
        by ceramic retainers that are keyed into the brick-lined
        furnace chamber sidewalls. No heating elements are
        located on the bottom of the chamber
§   One-piece lift-off type cover on Model PF-500 and smaller.
        Split swinging covers on Model PF-1000 and larger.
§   One sheathless type thermocouple for heat chamber
        control and one alloy sheathed thermocouple in the pot
        proper.
§   One sheathless thermocouple for furnace overtemperature                            High Temperature
                                                                                          Insulation                      Vessel
        control or one gold fuse which melts at
        1940°F (1060°C) for furnace over temperature protection                                       Schematic View --- Cutaway Section
        in stainless steel and inconel vessels.                                                              PF Furnace Series

PF Series --- Standard Sizes --- 900°F (482°C) or 1700°F (927)°C
                                                             Pot Size                Outside
                                                                                                              OPTIONS:
      Type            Kw          Volts*         PH.     Diameter Depth          Diameter Height
                                                                                                              §   Fused safety disconnect
   PF-50              1.9           120            1          5"           6"         15"         18"
                                                                                                                      switch.
   PF-100             6.5           120            1          6"          12"         24"         26"
   PF-200             7.3           120            1          8"          14"         27"         26"         §   Standard NEMA and UL listed
   PF-500             13         120/240         3/1 †       10"          18"         29"         32"                 switchgear and control
   PF-1000            17         120/240         3/1 †       12"          24"         32"         33"                 panel.
   PF-1500            21         240/480         3/1 ¤       16"          24"         42"         38"         §   Electronic Control instrument
   PF-1600            24         240/480           3         18"          20"         42"         38"                 and product over tempera-
   PF-1900            27         240/480           3         16"          30"         36"         47"                 ture protection as required.
   PF-2500            27         240/480           3         20"          24"         44"         45"         §   Special purpose accessories.
   PF-3500            36         240/480           3         24"          24"         48"         45"
   PF-5000            42         240/480           3         24"          30"         48"         52"
• 1600°F (871)°C for neutral salts applications.         * Voltages listed are not dual voltages.
 † 12O Volt, 3-Phase or 240 Volt, Single-Phase           ¤ 240 Volt, 3-Phase or 480 Volt, Single-Phase


7-2005                                                                 -8-                                                           Bulletin - 20
                                                                                                                201 Leverington Avenue
                                                                                                                 Philadelphia, PA 19127
                                                             TROUGH                                             Phone: 215.482.5000
                                                                                                                Fax:      215.482.9389
                                                            FURNACES                                          Website: www.trentheat.com
                                                                                                              E-mail:   trentheat@ aol.com

                                                                                   Insulated Roller
                                                                                     Type Cover
TF/TFL Series --- 1700°F (927°C) Max.
TRENT Trough Furnaces are similar to the pot type PF series. With
a 1700°F (927°C) maximum temperature, the TF/TFL series is offered
with the standard features listed below with optional extras available.

STANDARD FEATURES:
§   Standard parts with little or no maintenance required.
§   Laminated fire brick chamber liner and throat backed by slab
        type secondary insulation.
§   All Pots to have flange and skirt with gasket seal to prevent
        seepage of the salt into the furnace chamber and are
        constructed of pressed steel, inconel or stainless steel
        depending on the operating temperature.
§   TRENT Folded and Formed® heating elements supported
        by ceramic retainers that are keyed into the brick-lined
                                                                                                                              High Temperature
        furnace chamber sidewalls. No heating elements are                                                                   Brick and Laminated
        located on the bottom of the chamber                                                                                      Insulation
§   One-piece insulated manually operated cover mounted on
                                                                                                                 Vessel
        rollers for easy opening and closing.                               Folded and Formed®
                                                                             Heating Elements
§   One sheathless type thermocouple for heat chamber                         on All Sidewalls
        control and one angle type alloy sheathed thermocouple
        in the pot
        proper.
§   One sheathless thermocouple for steel vessel furnace over
        temperature control or one gold fuse which melts at
        1940°F(1060°C) for furnace over temperature protection in
        stainless steel and inconel vessels.

OPTIONS:
§   Fused safety disconnect switch.
§   Standard NEMA and UL listed switchgear and control
       panel.
§   Electronic Control instrument and product over tempera-
       ture protection as required.
§   Special purpose accessories.


                                                                                              TF Series Trough Furnace


        TFL TF Series --- Standard Sizes --- 1700°F (927°C) Maximum
                                 kW                                                    Inside                        Outside
            Type         900°F        1700°F     Volts*       PH.             W          H            D      W         H           D
        TFL-13              10            7.5       240         1            13"         13"       10"        32"      32"        30"
        TFL-18              36            24      240/480       3            30"         18"       18"        48"      36"        42"
        TFL-34              40            33      240/480       3            30"         21"       34"        53"      44"        52"
        TFL-48              40            30      24/0480       3            48"         20"       20"        70"      43"        42"
        TF-20                      20               240         1            20"         12"       18"        44"      36"        40"
        TF-30                      27               240         3            30"         12"       18"        54"      36"        44"
        TF-40                      33             240/480     3/1 †          40"         12"       18"        64"      36"        44"
        TF-50                      40             240/480       3            50"         12"       18"        74"      36"        44"
        TF-60                      46             240/480       3            60"         12"       18"        84"      36"        44"
        TF-88                      70             240/480       3            88"         12"       18"       107"      36"        44"
        * Voltages listed not dual --- specify.                                       Larger custom sizes can be quoted.
        † 12O Volt, 3-Phase or 240 Volt, Single-Phase


7-2005                                                              - 9 -                                                         Bulletin - 20
                                                                                                                    201 Leverington Avenue
                                                                                                                     Philadelphia, PA 19127
                                                     PIT FURNACES                                                    Phone: 215.482.5000
                                                                                                                    Fax:      215.482.9389
                                                                                                                  Website: www.trentheat.com
                                                                                                                  E-mail:   trentheat@ aol.com


PT Series --- 1850°F (1010°C) Max.                                                           Alloy Heating
                                                                                                                              Split Swing
                                                                                                                                Cover
                                                                                                Element
The TRENT Pit Type Furnace is used for heat treating of ferrous and non-ferrous                 Guards
metals, firing of ceramics, annealing of glassware, processing of chemicals and
general research purposes. It has the same design features as the Pot Type
Furnace with the exception that no pot is included. High alloy metallic guards are
placed over the heating elements to prevent damage while loading.

Standard furnace is available for operating temperatures of 1850°F. Furnaces with
operating temperatures of 2150°F. are available as an option.                                    High
                                                                                             Temperature
                                                                                              Insulation


STANDARD FEATURES:                                                                                           Folded and Formed® Heating Elements

§   Standard parts with little or no maintenance required.                             Schematic Views --- Cutaway Section
§   Fire brick chamber liner and throat backed by slab type secondary insulation.                 PT Furnace Series
§   PT Series Furnaces have no retort or pot and are complete with high alloy metal
        guards in the furnace chamber to prevent heating element damage when loading.
§   TRENT Folded and Formed® heating elements supported by ceramic retainers that are keyed into the brick-lined
        furnace chamber.
§   PF-Series Furnaces have one-piece lift-off type cover on Model PF-500 and smaller. Split swinging covers on
        Model PF-1000 and larger.
§   One thermocouple for heat chamber control.


OPTIONS:
§   Fused safety disconnect switch.
§   Standard NEMA and UL listed switchgear and control panel.
§   Electronic Control instrument and product over temperature protection as required.
§   Special purpose accessories.


                         PT Series -- Standard Sizes -- 1850°F (1010°C) Continuous Rating
                            or 2150° (1177°C) Intermittent Rating on Request
                                                                     Work Chamber      Outside
                            Type        Kw      Volts*      PH.     Diameter Depth Diameter Height
                            PT-50       1.9      120          1         6"        8½"       27½"         18"
                            PT-100      6.5      120          1         7"        16"       28½"         26"
                            PT-200      7.3      120          1        12"        16"        34"         26"
                            PT-500       13    120/240      3/1 †      12"        22"        34"         32"
                            PT-1000      17    120/240      3/1 †      14"        24"        36"         33"
                            PT-1600      24    240/480        3        21"        25"        42"         38"
                            PT-1900      27    240/480        3        18"        29"        40"         47"
                            PT-2500      27    240/480        3        23"        25"        44"         45"
                            PT-3500      36    240/480        3        27"        25"       49½"         45"
                            PT-5000      42    240/480        3        27"        32"       49½"         52"
                         * Voltages listed are not dual voltages --- specify.   Larger Sizes are available.
                          † 12O Volt, 3-Phase or 240 Volt, Single-Phase
                         ¤ 240 Volt, 3-Phase or 480 Volt, Single-Phase




7-2005                                                                - 10 -                                                         Bulletin - 20
                                                                                                                  201 Leverington Avenue
                                                                                                                   Philadelphia, PA 19127
                                                VERTICAL RETORT                                                   Phone: 215.482.5000
                                                                                                                  Fax:      215.482.9389
                                                   FURNACES                                                     Website: www.trentheat.com
                                                                                                                E-mail:   trentheat@ aol.com


VR Series --- 2000°F (1093°C) Max.                                                                        Insulated
                                                                                                         Retort Cover
                                                                                                                        Thermowell
The TRENT Vertical Retort Furnace employs the same basic design features as the                   Atmosphere                           Atmosphere
TRENT Pot Type Furnace with the exception that a high alloy gas tight retort is substi-              Inlet                               Outlet
tuted for the salt pot. This retort is complete with insulated cover containing thermowell,
gas inlet and outlet. The furnace is used primarily in metal working industry for such
operations as sintering, brazing, annealing, etc., under controlled atmospheres. It is also
used in research facilities for numerous purposes.

RETORT OPERATION CONTROL
A controlling pyrometer thermocouple is placed in the furnace heating chamber. Another
thermocouple is placed in the retort thermowell. Each thermocouple is wired to a sepa-
rate control instrument. Both controller contacts are wired in series so that if heat cham-
ber temperature approaches set temperature before the material in the retort comes to               High
                                                                                                Temperature                      Alloy Retort
temperature. The heat chamber temperature is controlled until the material in the retort
                                                                                                 Insulation    Folded and Formed® Heating Elements
comes to temperature. At that point, the retort control takes over. This system prevents
damage to heating elements from over-temperature in heating chamber and insures a
                                                                                                    Schematic Views --- Cutaway Section
maximum safe heating rate.
                                                                                                           VR Furnace Series

STANDARD FEATURES:
§   Standard parts with little or no maintenance required.
§   Fire brick chamber liner and throat backed by slab type secondary insulation.
§   VR Series Furnaces have a full weld gas tight retort with a black heat absorbent coating, mounting flange and flat bottom.
§   TRENT Folded and Formed® heating elements supported by ceramic retainers that are keyed into the brick-lined
          furnace chamber.
§   VR-Series Furnaces have a fully insulated cover complete with atmosphere inlet, atmosphere outlet and thermowell.
§   One thermocouple for heat chamber control.
§   One thermocouple mounted in the retort thermowell.


OPTIONS:
§   Fused safety disconnect switch.
§   Standard NEMA and UL listed switchgear and control panel.
§   Electronic Control instrument and product over temperature protection as required.
§   Special purpose accessories.



                     VR Series --- Standard Sizes --- 2000°F (1093°C)
                                                                                  Retort Size              Outside
                          Type             Kw         Volts*         PH.       Diameter Depth          Diameter Height
                        VR-50               1.9          120             1             5"        6"         15"          18"
                        VR-100              6.5          120             1             6"       12"         24"          26"
                        VR-200              7.3          120             1             8"        9"         27"          26"
                        VR-500              13         120/240        3/1 †           10"       13"         29"          32"
                        VR-1000             17         120/240        3/1 †           12"       21"         32"          33"
                        VR-1500             21         240/480        3/1 ¤           16"       21"         42"          38"
                        VR-1600             24         240/480           3            18"       15"         42"          38"
                        VR-1900             27         240/480           3            16"       25"         36"          47"
                        VR-2500             27         240/480           3            20"       19"         44"          45"
                        VR-3500             36         240/480           3            24"       19"         48"          45"
                        VR-5000             42         240/480           3            24"       25"         48"          52"
                     * Voltages listed are not dual voltages --- specify w ith order.
                      † 12O Volt, 3-Phase or 240 Volt, Single-Phase              ¤ 240 Volt, 3-Phase or 480 Volt, Single-Phase




7-2005                                                                - 11 -                                                         Bulletin - 20
                                                                                                                          201 Leverington Avenue
                                                           AIR DRAW or                                                     Philadelphia, PA 19127

                                                           PIT FURNACES
                                                                                                                          Phone: 215.482.5000
                                                                                                                          Fax:      215.482.9389
                                               VERTICAL AIR RECIRCULATION                                               Website: www.trentheat.com
                                                                                                                        E-mail:   trentheat@ aol.com


                                                                                                                              Insulated Cover with
M2-CAH Series --- 1400°F (760°C) Max.                                                                                           Lift-Swing Handle

The TRENT M2-CAH Series Air Draw or Vertical Pit Furnace is designed to
meet the demands of the Heat Treating Industry for a precise and efficient furnace                           High
for drawing, tempering and annealing at temperatures up to 1400’F. The M2-CAH                            Temperature
Design satisfies the industry requirements of space economy, acquisition economy,                         Insulation
rugged construction and precise duplication of results in each processed batch.
                                                                                                   Folded & Formed®
The M2 design embodies an upper work chamber and lower fan chamber beneath Heating Elements
this work chamber. The exterior furnace shell is of heavy gauge carbon steel and
painted with a heat resistant paint. The entire furnace is insulated with high grade    Alloy Steel Work
brick for the chamber liner, backed by courses of medium temperature insulating         Basket with Solid
slabs for minimum heat loss and lower outer casing temperature. The heating ele-              Sides
ments are TRENT FOLDED & FORMED® alloy ribbon type located only on the
                                                                                            Heavy Screen
side walls of the upper or work chamber and mounted to ceramic element retain-             Basket Bottom
ers that are keyed to the brick chamber liner. In the lower chamber a plug type high
temperature alloy blade fan is mounted, powered by a heavy duty indirect drive
                                                                                              Alloy Steel
motor mounted to furnace legs. A fixture support jig of alloy construction which             Recirculating
supports the load basket is located above the fan. The load basket is also alloy                  Fan
construction and has solid metal sides and a heavy duty screen bottom. The solid
metal load basket sides serve a dual purpose; to diffuse the direct radiant heat and               Fan Motor
prevent it from coming into direct contact with the work load proper and also to act
as the air recirculation channel wall. The air recirculation pattern is such that air
enters the work basket at the top, passes downward through the load, through the
basket screen and sucked into the fan, which then expels the air sideways into the                        Air Draw Furnace
entire annular space surrounding the fan in the lower chamber. The pressure forces the air upwards along the side walls of the fan
chamber and then into the space between the load basket and upper chamber sidewalls where the FOLDED & FORMED® heating ele-
ments are located. As the air passes thru this space it is continuously reheated prior to its re-entrance into the work basket at the top.
Alloy baffles are employed where required to afford uniformity of air flow. The furnace is delivered with control thermocouple installed.
Add your own control package or let TRENT configure one for you

STANDARD FEATURES:
§   Standard parts with little or no maintenance required.                      §     Door switch to shut off the fan and heaters when the cover
§   Laminated fire brick chamber liner and throat backed by                             is raised.
       slab type secondary insulation.                                          §     Control thermocouple installed.
§   Rugged steel construction for industrial use.
§   Forced vertical air circulation, top to bottom.                             OPTIONS:
§   Two chamber construction with upper work chamber and                        §     Fused safety disconnect switch.
       lower fan section.                                                       §     Standard NEMA and UL listed switchgear and floor mounted
§   Stainless steel interior, air flow baffles and work chamber                           control panel for mounting beside the furnace.
       base to support the stainless steel load basket.                         §     Control instrument as required.
§   Insulated, arm mounted, manual-lift swing cover.
                                                                                §     Air cylinder operation of cover lift with manual swing away of
§   Indirect drive fan motor and removable plug type stainless
                                                                                          cover.
       steel fan.
§   TRENT Folded and Formed® heater racks for long life and                     §     Non-explosive atmosphere operating feature.
       closer temperature control.                                              §     Special purpose accessories.

             M2-CAH Series --- Standard Sizes --- 1400°F (760°C) Maximum
                                                                            Chamber Size                  Outside                Fan
                  Type            Watts         Volts*         PH.        Diameter Depth              Diameter Depth            Motor
              M2-CAH-1818           20         240/480           3              18"          18"          47"           92"      1 HP
              M2-CAH-2226           40         240/480           3              22"          26"          53"          102"      2 HP
              M2-CAH-2230           40         240/480           3              22"          30"          53"          106"      2 HP
              M2-CAH-2236           45         240/480           3              22"          36"          53"          115"      3 HP
              M2-CAH-2248           55         240/480           3              22"          48"          53"          128"      3 HP
              M2-CAH-3336           60         240/480           3              33"          36"          65"          119"      5 HP
              M2-CAH-3348           75         240/480           3              33"          48"          65"          131"      5 HP
             * Voltages listed are not dual voltages --- specify w ith order.

7-2005                                                                   - 12 -                                                             Bulletin - 20
                                                                                                                 201 Leverington Avenue
                                                                                                                  Philadelphia, PA 19127
                                                            BELL TYPE                                            Phone: 215.482.5000
                                                                                                                 Fax:      215.482.9389
                                                            FURNACES                                           Website: www.trentheat.com
                                                                                                               E-mail:   trentheat@ aol.com


BA Series --- 1850°F (1010°C) Max. Continuous
          --- 2100°F (1149°C) Max. Intermittent                                            High Temperature
                                                                                                               Lifting Lug    Folded and Formed®
                                                                                                                               Heating Elements
                                                                                              Insulation
TRENT Bell Furnaces are designed as a general purpose furnace used for heat
treating large motors and transformers, annealing large glass masses and other heat
treating applications in various industries.

Bell furnaces use direct radiant heat and are engineered to deliver a uniform blan-
ket of heat to the work load over which it is placed. Built with heavy gauge carbon
steel outer casings, the furnaces are insulated with high grade brick as the chamber
liner, backed by courses of medium temperature insulating slabs for minimum heat
loss and low outer casing temperature. The heating elements are TRENT Folded
and Formed® alloy ribbon type located on side walls only and mounted to ceramic
element retainers that are keyed to the brick chamber liner and are protected by high
temperature alloy metallic guards from damage when the furnace is raised and low-
ered.

TRENT offers an optional insulated base designed to the customers requirements.
Handling equipment is generally provided by the customer since the methods of rais-
ing and lowering the Bell furnace will vary from application to application.                   Alloy Heating                 Optional Insulated Base
                                                                                              Element Guards                    to Mount Furnace
Control is obtained through the use of pyrometer or potentiometer supplied by a rep-            Schematic View --- Cutaway Section
utable manufacturer. Straight off/on control is usually satisfactory, but more sophisti-               BA Furnace Series
cated systems may be dictated by the process.


STANDARD FEATURES:                                                         OPTIONS:
§   Standard parts with little or no maintenance required.                 §   Insulated furnace base.
§   Laminated fire brick chamber liner and throat backed by slab           §   Furnace lifting mechanism.
        type secondary insulation.                                         §   Fused safety disconnect switch.
§   TRENT Folded and Formed® heating elements supported                    §   Standard NEMA and UL listed switchgear and
        by ceramic retainers that are keyed into the brick-lined                  control panel.
        furnace chamber sidewalls. No heating elements are                 §   Electronic control instrument and product over tempera-
        located on the top of the chamber                                         ture protection as required.
§   Lifting Lugs as required.                                              §   Special purpose accessories.
§   One sheathless type thermocouple for heat chamber
        control.
§   One gold fuse which melts at 1940°F(1060°C) for furnace
         over temperature protection.


                       BA Series --- Standard Sizes --- 1850°F (1010°C) Continuous Rating or
                                   2100° (1149°C) Intermittent Rating on Request
                                                                                  Chamber Size            Outside
                          Type             Kw          Volts*      PH.          Diameter Height       Diameter Height
                     BA-50                  1.9           120        1             6"        8-1/2"     27-1/2"       18"
                     BA-100                 6.5           120        1             7"         16"       28-1/2"       26"
                     BA-200                 7.3           120        1            12"         16"         34"         26"
                     BA-500                 13          120/240    3/1 †          12"         22"         34"         32"
                     BA-1000                17          120/240    3/1 †          14"         24"         36"         33"
                     BA-1600                24          240/480      3            21"         25"         42"         38"
                     BA-1900                27          240/480      3            18"         29"         40"         47"
                     BA-2500                27          240/480      3            23"         25"         44"         45"
                     BA-3500                36          240/480      3            27"         25"       49-1/2"       45"
                     BA-5000                42          240/480      3            27"         32"       49-1/2"       52"
                     * Voltages listed are not dual voltages.                  † 12O Volt, 3-Phase or 240 Volt, Single-Phase.


7-2005                                                              - 13 -                                                            Bulletin - 20
                                                                                                             201 Leverington Avenue
                                                                                                              Philadelphia, PA 19127
                                                   BOX FURNACES                                               Phone: 215.482.5000
                                                                                                             Fax:      215.482.9389
                                                                                                           Website: www.trentheat.com
                                                                                                           E-mail:   trentheat@ aol.com


H Series --- 1850°F (1010°C) Max.
TRENT H Series Box Furnaces are used for heat treating ferrous and non-ferrous metals, firing of
ceramics, annealing of glassware, processing of chemicals and for general research purposes requir-
ing accurate, uniform heating.

Construction: The furnaces are built with heavy gauge steel outer casings reinforced for rigidity and
rugged service. The basic furnace is designed for use with an oxidizing atmosphere. Optional con-
trolled atmosphere construction is available with gas-tight welding, atmosphere inlet and outlet and
other features. They are insulated with high grade brick as the chamber liner backed by courses of
medium temperature insulating slabs for minimum heat loss and low outer casing temperature. The
heating elements are TRENT Folded and Formed® alloy ribbon type located on the sidewalls, top
and bottom of the chamber and mounted to ceramic element retainers that are keyed to the brick
chamber wall. The heating element spacing assures a uniform temperature throughout the work
chamber area. A silicon carbide hearth plate protects the heating elements on the floor and also sup-
ports the work load. The counter-weighted vertical-lift door is standard for manual operation. All fur-
naces are leg mounted to bring hearth 36” above floor level. Standard H Type Furnace carries a max-       H Series Furnace
imum chamber continuous operating temperature of 1850°F (1010°C). All furnaces are delivered with with air operated vertical-lift door
chamber control thermocouple installed. Control packages are optional as required by the customer.

STANDARD FEATURES:
§   Standard parts with little or no maintenance required.             §     Legs to bring the hearth 36” above floor level
§   Laminated fire brick chamber liner and throat backed by slab       §     Chamber thermocouple and either a gold fuse (1940°F melt-
        type secondary insulation.                                              ing point), or a second thermocouple for furnace
§   Rugged steel construction for most industrial uses.                         over-temperature protection.
§   Silicon carbide type hearth plate.
§   Vertical lift, counter-weighted door for quick access to work      OPTIONS:
        chamber; door gasket and toggle claps for tight seal.          §
                                                            Fused safety disconnect switch, standard NEMA and UL listed
§   TRENT Folded and Formed® heating elements supported        switchgear and control panel for remote mounting.
                                                          § Control instrument as required.
        by ceramic retainers that are keyed into the brick lined
        furnace chamber sidewalls, top and bottom.        § High temperature operation for intermittent use to 2150°F max.
                                                                                                 § Fabricated 330 stain-
H Series ---    Standard Sizes --- 1850°F (1010°C) Continuous Rating or                               less steel hearth
                            2150° (1177°C) Intermittent Rating on Request                             (1850°F max. only)
                                                   Inside                   Outside              § Air Cylinder door lift-
    Type          kW      Volts*    PH.      W        H      D         W        H         D           ing mechanism.
  H-12918          8       240        1      12"     9"     18"       44"      68"       48"     § Non-explosive type
  H-12921          14      240        1      12"     9"     24"       44"      68"       54"          atmosphere opera-
  H-12936          18      240        1      12"     9"     36"       44"      68"       66"          tion capabilities with
  H-151224         18    120/240    3/1 †    15"     12"    24"       47"      78"       54"          fully welded gas-tight
  H-151230         18    120/240    3/1 †    15"     12"    30"       47"      78"       60"          construction, atmos-
  H-151236         24      240        3      15"     12"    36"       47"      78"       66"          phere inlet and out-
  H-181536         30      240        3      18"     15"    36"       50"      74"        6"          let and other features
  H-181548         36      240        3      18"     15"    48"       50"      74"       78"
                                                                                                 § Special purpose
  H-181818       16.5      240        1      18"     18"    18"       50"      77"       48"
                                                                                                      accessories.
  H-181836           33        240/480 ¤       3     18"       18"        36"      57"          77"       66"
  H-241836           38        240/480 ¤       3     24"       18"        36"      56"          77"       66"
  H-241848           50         240/480        3     24"       18"        48"      56"          77"       78"
  H-241860           60         240/480        3     24"       18"        60"      56"          77"       90"
  H-242460           70         240/480        3     24"       24"        60"      56"          83"       90"
  H-242424           30            240         3     24"       24"        24"      56"          83"       54"
  H-242448           45         240/480        3     24"       24"        48"      56"          83"       78"
  H-303054           85         240/480        3     30"       30"        54"      62"          89"       84"
  H-362448           70         240/480        3     36"       24"        48"      68"          83"       78"
* Voltages listed are not dual voltages.                    ¤ 480 Volt, 3-Phase available only for 1850°F
 † 12O Volt, 3-Phase or 240 Volt, Single-Phase              Larger Custom Sizes are available.

7-2005                                                              - 14 -                                                  Bulletin - 20
                                                                                                              201 Leverington Avenue
                                                                                                               Philadelphia, PA 19127
                                                  MUFFLE DESIGN                                                Phone: 215.482.5000
                                                                                                              Fax:      215.482.9389
                                                  BOX FURNACES                                              Website: www.trentheat.com
                                                                                                            E-mail:   trentheat@ aol.com


HM Series Muffle Design --- 1900°F (1083°C) Max.
The demand for small atmosphere furnaces, where atmosphere control must be positive
yet can effectively operate without atmosphere generating equipment has been met by
TRENT through the HM Muffle design box furnace.

This furnace can be used for tool hardening, low temperature brazing, bright annealing,
general metal heat treating and other processes requiring a controlled atmosphere up to
1900”F (1083°C). Like the H Series Box Furnaces the HM muffle Design Series fur-
naces utilize TRENT Folded and Formed® alloy ribbon type heating elements which
are located on both side walls, top and bottom of the chamber and mounted to ceramic
element retainers keyed to the brick chamber wall. These elements are replaced by sim-
ply sliding them in and out of the ceramic retainers. Heating elements are spaced to
assure a uniform temperature throughout The furnace is equipped with a gas tight muf-
fle made of high alloy metal complete with atmosphere inlet, outlet and thermowell. The
muffle feature permits the use of bottled gases. For purposes of quick cooling, a pres-          HM Series Muffle Design Box Furnace
sure blower system may be added to this furnace at slight additional cost. If desired, the         with dolly and remote control panel
muffle may be mounted to an optional wheeled dolly to permit quick and easy removal
of muffle for cooling purposes.

Furnace has operating temperature limitation of 1900’F (1083°C).

RETORT OPERATION CONTROL:                    A controlling pyrometer thermocouple is placed in the furnace heating chamber. Another
thermocouple is placed in the retort thermowell. Each thermocouple is wired to a separate control instrument. Both controller contacts
are wired in series so that if the heat chamber temperature approaches set temperature before material in retort comes to temperature,
the heat chamber temperature is controlled. Then as material in the retort comes to temperature the retort control takes over.

This system prevents damage to heating elements through over-temperature in the heating chamber and insures a maximum safe heat-
ing rate.

STANDARD FEATURES:                                                    OPTIONS:
§   Standard parts with little or no maintenance required.            §     Fused safety disconnect switch.
§   4-½" of LW-23 brick backed by 4-½” of slab type secondary         §     Standard NEMA and UL listed switchgear and control panel
       insulation.                                                             for remote mounting.
§   Rugged steel construction for most industrial uses.               §     Control instrument as required.
§   Fully welded gas-tight 330 stainless steel muffle complete        §     Forced cooling pressure blower mounted and rated 874 CFM
       with mounting flange, insulated cover with atmosphere                   at ½” static pressure.
       inlet, outlet and gas-tight thermowell.                        §     Dolly mounted muffle for easy removal of muffle from the fur-
§   TRENT Folded and Formed® heating elements supported                        nace chamber for cooling purposes.
       by ceramic retainers that are keyed into the brick lined       §     Special purpose accessories.
       furnace chamber sidewalls, top and bottom.
§   Legs to bring the hearth 36” above floor level
§   Chamber and retort thermocouples.

              HM Series --- Standard Sizes --- 1900°F (1038°C) Maximum
                                                                               Inside                        Outside
                   Type          kW          Volts*        PH.        W          H           D        W        H         D
                HM-12918            8            240         1       12"          9"       18"       44"           68"   48"
                HM-12924           14            240         1       12"          9"       24"       44"           68"   54"
                HM-12936           18            240         1       12"          9"       36"       44"           68"   66"
                HM-151224          18         120/240      3/1 †     15"         12"       24"       47"           78"   54"
                HM-151230          18         120/240      3/1 †     15"         12"       30"       47"           78"   60"
                HM-151236          24         120/240        3       15"         12"       36"       47"           78"   66"
              * Voltages listed are not dual voltages.                        Larger Custom Sizes are available.
               † 12O Volt, 3-Phase or 240 Volt, Single-Phase


7-2005                                                             - 15 -                                                      Bulletin - 20
                                                                                                                        201 Leverington Avenue
                                                          HORIZONTAL                                                     Philadelphia, PA 19127

                                                         RECIRCULATING
                                                                                                                        Phone: 215.482.5000
                                                                                                                        Fax:      215.482.9389
                                                           FURNACES                                                   Website: www.trentheat.com
                                                                                                                      E-mail:   trentheat@ aol.com


GF Series --- 1400°F (790°C) Max.                                                                     Vertical Lift
                                                                                                         Door             High                Recirculating
TRENT GF Series Horizontal Air Recirculating Furnace                                                                  Temperature   Alloy
                                                                                                                                    Muffle        Fan
                                                                                                                       Insulation
is used in the metal working and glass industry for                                                                                                 Drive
annealing glassware, annealing and cleaning of distilla-                                                                                            Motor
tion columns and drying. The metal trades use this fur-
nace extensively for tempering, aging, drawing and other
heating operations.

Mounted in the furnace chamber is a 310 type stainless
steel four-sided muffle of heavy gauge stock. The rear
wall of the muffle has a guarded opening behind which is
an alloy steel centrifugal flow type fan. The fan draws air
across and around the work load in the muffle, with air
passing horizontally from front to back, then returns air to                                                                      Folded and Formed®
the front of the furnace through the annular space                                                                                  Heating Element
                                                                                                                                on sides, top and bottom
between the muffle outer wall and the furnace inner liner,
where the heating elements are located. The air passes                                                   Schematic View --- Cutaway Section
through this space on all four sides of the muffle for con-                                                     GF Series Furnace
tinuous and even reheating.
STANDARD FEATURES:
§    Standard parts with little or no maintenance required.                   §   One control thermocouple for heat chamber
§    Laminated fire brick chamber liner and throat backed by                         control installed.
        slab type secondary insulation.                                       §   Legs to bring the hearth to a workable height.
§    Rugged steel construction for most industrial uses.
§    Horizontal air circulation, front to back.                               OPTIONS:
§    Stainless steel reinforced muffle which acts as an air recir-            §   Fused safety disconnect switch.
        culation channel and hearth with two (2) removable                    §   Standard NEMA and UL listed switchgear & control panel.
        shelves                                                               §   Electronic Control instruments as required.
§    TRENT Folded and Formed® heating elements supported
                                                                              §   Swing-hinged, manually operated vertical-lift or air-operated
        by ceramic retainers that are keyed into the brick-lined
                                                                                     vertical lift door
        furnace chamber sidewalls, top and bottom.
                                                                              §   Special purpose accessories.
§    One-piece insulated side-hinged plug type door.

    GF Series --- Standard Sizes --- 1400°F (760°C) Maximum
                       kW                                    Inside                       Outside                 Fan         Motor          Hearth
       Type       Glass Metal          Volts*        W         H          D         W       H          D         Motor        Drive          Height
      GF-1318        11       24        240          13"       18"        24"      40"       71"        65"       1 HP      Direct           39½"
      GF-1824        12       24        240          18"       18"        24"      45"       71"        65"       1 HP      Direct           39½"
      GF-2678        12       24        240          18"       18"        36"      45"       71"        78"       1 HP      Direct           39½"
      GF-3454        15       30        240          18"       18"        48"      45"       71"        90"       1 HP      Direct           39½"
      GF-2424        18       30        240          24"       24"        24"      51"       73"        66"       1 HP      Direct            36"
      GF-2436        21       30      240/480        24"       24"        36"      51"       73"        78"       1 HP      Direct            36"
      GF-2448        23       35      240/480        24"       24"        48"      51"       73"        90"       1 HP      Direct            36"
      GF-2460        30      45 †     240/480        24"       24"        60"      51"       73"       102"      1 HP †    Direct †           36"
      GF-2472        36      40 †     240/480        24"       24"        72"      51"       73"       114"      1 HP †    Direct †           36"
      GF-3036        24       30      240/480        30"       30"        36"      57"       73"        78"       1 HP      Direct            30"
      GF-3048        30      40 †     240/480        30"       30"        48"      57"       73"        90"      1 HP †    Direct †           30"
      GF-3060        36       40      240/480        30"       30"        60"      57"       73"       102"       2 HP     Indirect           30"
      GF-3072        36       40      240/480        30"       30"        72"      57"       73"       114"       2 HP     Indirect           30"
      GF-3636             39          240/480        36"       36"        36"      64"       75"        78"       2 HP     Indirect           30"
      GF-3648             50          240/480        36"       36"        48"      64"       75"        90"       2 HP     Indirect           24"
      GF-3660             60          240/480        36"       36"        60"      64"       75"       102"       2 HP     Indirect           24"
      GF-3672             75          240/480        36"       36"        72"      64"       75"       114"       2 HP     Indirect           24"
                                                                                                     Larger Custom Sizes are available.
    * All Voltages are 3-Phase. Voltages listed are not dual voltages --- please specify w hen ordering.
    † These furnaces have 2 HP Indirect Drive Motors.


 7-2005                                                                  - 16 -                                                           Bulletin - 20
                                                                                                                   201 Leverington Avenue
                                                        HORIZONTAL                                                  Philadelphia, PA 19127

                                                       RECIRCULATING
                                                                                                                    Phone: 215.482.5000
                                                                                                                   Fax:      215.482.9389
                                                         FURNACES                                                Website: www.trentheat.com
                                                                                                                 E-mail:   trentheat@ aol.com


GFH Series --- 1750°F (954°C) Max.
TRENT GFH Series Horizontal Air Recirculating Furnace is used in the metal
working and glass industry for annealing, heat treating,etc at temperatures
greater than 1400°F.

Similar in design to the GF Series Furnaces, the furnace chamber is a high
alloy four-sided muffle. The rear wall of the muffle has a guarded opening
behind which is a high alloy steel centrifugal flow type fan. The fan draws air
across and around the work load in the muffle, with air passing horizontally
from front to back, then returns air to the front of the furnace through the annu-
lar space between the muffle outer wall and the furnace inner liner, where the
heating elements are located. The air passes through this space on all four
sides of the muffle for continuous and even reheating.


                                                                                                                    GFH Series
 STANDARD FEATURES:                                                                                          Air Recirculating Furnace
 §   Standard parts with little or no maintenance required.
                                                                            OPTIONS:
 §   Laminated fire brick chamber liner and throat backed by
                                                                            §   Fused safety disconnect switch.
        slab type secondary insulation.
 §   Rugged steel construction for most industrial uses.                    §   Standard NEMA and UL listed switchgear and control
 §   Horizontal air circulation, front to back.                                     panel.
 §   High alloy muffle to withstand elevated temperatures and               §   Electronic Control instrument and product over tempera-
        acts as an air recirculation channel and hearth with two                    ture protection as required.
        (2) removable shelves                                               §   Air cylinder door lifting mechanism
 §   TRENT Folded and Formed® heating elements supported                    §   Special purpose accessories.
        by ceramic retainers that are keyed into the brick-lined
        furnace chamber sidewalls, top and bottom.
 §   Vertical lift, counter-weighted door for quick access to work
        chamber; door gasket and toggle clamps for tight seal.
 §   One control thermocouple for heat chamber
        control installed.
 §   Legs to bring the hearth to a workable height.

        GFH Series --- Standard Sizes --- 1750°F (954°C) Maximum
                                                              Inside                         Outside                 Fan †         Hearth
            Type           kW          Volts*         W         H          D          W        H            D         Motor        Height
          GFH-1318           17           240        13"        18"        24"         49"       77"        72"       1 HP          36"
          GFH-1824           20           240        18"        18"        24"         54"       77"        72"       1 HP          36"
          GFH-2678           30           240        18"        18"        36"         54"       77"        84"       1 HP          36"
          GFH-3454           40        240/480       18"        18"        48"         54"       77"        96"       2 HP          36"
          GFH-2424           30           240        24"        24"        24"         60"       85"        72"       1 HP          36"
          GFH-2436           45        240/480       24"        24"        36"         60"       85"        84"       2 HP          36"
          GFH-2448           60        240/480       24"        24"        48"         60"       85"        96"       2 HP          36"
          GFH-2460           75        240/480       24"        24"        60"         60"       85"       108"       2 HP          36"
          GFH-2472           90        240/480       24"        24"        72"         60"       85"       120"       2 HP          36"
          GFH-3036           52        240/480       30"        30"        36"         66"       86"        84"       2 HP          30"
          GFH-3048           70        240/480       30"        30"        48"         66"       86"        96"       2 HP          30"
          GFH-3060           85        240/480       30"        30"        60"         6"        86"       108"       2 HP          30"
          GFH-3072          120        240/480       30"        30"        72"         66"       86"       120"       2 HP          30"
          GFH-3636           63        240/480       36"        36"        36"         72"       88"        84"       2 HP          30"
          GFH-3648           84        240/480       36"        36"        48"         72"       88"        96"       2 HP          24"
          GFH-3660          105        240/480       36"        36"        60"         72"       88"       108"       2 HP          24"
          GFH-3672          125        240/480       36"        36"        72"         72"       88"       120"       2 HP          24"
         * All Voltages are 3-Phase. Voltages listed are not dual voltages --- please specify w hen ordering.
         † All furnaces have Indirect Drive Motors.                                           Larger Custom Sizes are available.


 7-2005                                                                - 17 -                                                        Bulletin - 20
                                                                                                                       201 Leverington Avenue
                                                 HIGH TEMPERATURE                                                       Philadelphia, PA 19127
                                                                                                                        Phone: 215.482.5000
                                                   BOX FURNACES                                                        Fax:      215.482.9389
                                                                                                                     Website: www.trentheat.com
                                                                                                                     E-mail:   trentheat@ aol.com


SCR Series --- 2500°F (1371°C) to
               2750°F (1510°C) Max.                                                                                               High Temperature
                                                                                                             Atmosphere               Brick and
                                                                                                                Inlet                Laminated
The TRENT SCR Series High Temperature Box Furnaces is designed to oper-                      Counterweighted                          Insulation
                                                                                                  Door
ate at temperatures up to 2500°F (1371°C) in a reducing atmosphere and 2750°F
(1510°C) in an air atmosphere. The outer casing is reinforced welded carbon
steel, lined with two grades of laminated, high temperature insulation. The heat-
ing elements are silicon carbide type resistors located on the ceiling and beneath
a silicon carbide hearth plate. These elements are connected in series for 240 or
480 volt operation.
                                                                                                                                           Silicon
The brick-lined furnace chamber reflects heat, radiating it into the charge. This                                                       Carbide Rod
                                                                                                                                        Type Heating
also aids in maintaining fine temperature distribution throughout the furnace.               Flame Curtain
                                                                                                                                         Elements
                                                                                                Burner
With the heating elements located beneath the hearth are protected against scale
and accidental breakage.                                                                                                        Silicon Carbide
                                                                                                                  Gas Tight      Hearth Plate
                                                                                                                 Terminal Box
The standard door is a manually operated, counterweighted, vertical lift type to
provide a tight seal with the brick lined furnace front. An air cylinder or electric            SCR Type Furnace
motor door operation is optional. The standard furnace is built for operation with           for reducing atmosphere
an air atmosphere. The furnace can be delivered with a gas tight outer casing,
gas tight terminal boxes, atmosphere inlet, flame burner curtain and slant mounted counterweighted manually operated door for use in
a reducing atmosphere. An automatic, indicating, controlling type temperature instrument can be supplied with a magnetic contactor,
and platinum rhodium type thermocouple. The temperature control instrument is usually for remote mounting by the user.




STANDARD FEATURES:                                                         OPTIONS:
§   Standard parts with little or no maintenance required.                 §      Fused safety disconnect switch.
§   4-½" of brick backed by 2” of slab type secondary insulation.          §      Standard NEMA and UL listed switchgear and
§   Heavy duty welded steel construction for most industrial                         control panel.
        uses.                                                              §      Control instruments as required.
§   High grade silicon carbide type hearth plate.                          §      Gas tight construction for reducing atmosphere require-
§   Vertical lift, counter-weighted door for quick access                            ments.
        to work chamber.                                                   §      Special purpose accessories.
§   Heating elements are silicon carbide type resistors located
        beneath the hearth plate for long life.
§   Mounted on legs to bring the hearth 36” above floor level.
§   Platinum rhodium type thermocouple is standard.



             SCR Series --- Standard Sizes --- 2500-2750°F (1371-1510°C) Maximum
                                                                                    Inside                          Outside
                 Type           kW          Volts*         PH.          W             H          D           W        H           D
              SCR-10818        15         240/480           3            10"         8"         18"       40"       66"           45"
              SCR-121024       36         240/480           3            12"         10"        24"       42"       73"           57"
              SCR-151230       48         240/480           3            15"         12"        30"       44"       80"           61"
              SCR-181836       68         240/480           3            18"         18"        36"       48"       80"           67"
              SCR-241836       72         240/480           3            24"         18"        36"       54"       85"           67"
             * Transformer required for operation on either of listed voltages.              Larger Custom Sizes are available.




7-2005                                                                - 18 -                                                            Bulletin - 20
                                                                                                  201 Leverington Avenue
                                                                                                    Philadelphia, PA 19127
                                                  SINCE 1927                                   Phone:
                                                                                               Fax:
                                                                                                                 215.482.5000
                                                                                                                 215.482.9389
                                                                                               Website:      www.trentheat.com
                                                                                               E-mail:       trentheat@ aol.com

SOLVE YOUR HEATING PROBLEMS WITH


TRENT Electrically Heated Industrial Equipment &
   Folded and Formed® HEATING UNITS
TRENT exposed ribbon type heating elements have proven their advantages wherever
high-temperature, controlled, radiant heat is essential for efficient, low-cost processes.
The TRENT Folded and Formed® heating element is the heart of the CUSTOM-BUILT
EQUIPMENT AND HEATING UNITS......to assure a greater radiating surface per
square inch of cross-section than any other type of electrical heating element!


 DETAILS OF TRENT’S COMPLETE LINE OF ELECTRICALLY HEATED PROCESS EQUIPMENT AND HEATING
 ELEMENTS CAN BE FOUND ON OUR WEBSITE www.trentheat.com AND IN THE FOLLOWING LITERATURE:

        n       Capabilities Brochure                                                        Bulletin   -   CB
        n       Product Bulletin                                                             Bulletin   -   PB
        n       Folded and Formed® Heating Elements Pamphlet                                 Bulletin   -   FF
        n       Folded and Formed® Heating Units -                                           Bulletin   -   10
                        Folded and Formed® Heating Elements
                        Folded and Formed® Heater Racks
                        Plug Heaters
        n       Electric Furnaces                                                            Bulletin   -   20
        n       Electric Ovens                                                               Bulletin   -   30
        n       Electric Jackets                                                             Bulletin   -   40
        n       Electric Kettles and Melters                                                 Bulletin   -   50
        n       Conveyor Ovens and Furnaces                                                  Bulletin   -   60
        n       Immersion and Fintube Heaters -                                              Bulletin   -   70
                        Water Immersion Heaters
                        Oil Immersion and Fintube Heaters
        n       Other Heating Elements -                                                     Bulletin - 90
                        Strip Heaters
                        Cartridge Heaters
                        Tubular Heaters
                        Hot Plates
                        Ceramic Ring Heaters



                                                                                       WARRANTY:
   FOR MORE INFORMATION about our products,
   to request literature, or a quote use one of                       Most of our products carry a one-year war-
   the following methods:                                             ranty on material and workmanship.
                                                                      Exceptions are products used in extreme
       CALL                       1.800.544.TRENT                     heat applications or products determined to
       E-MAIL us at               trentheat@aol.com, or               be damaged through improper use or mis-
       VISIT our WEBSITE at       www.trentheat.com
                                                                      handling.




                                                                                                                      7-2005
                                      FURNACE QUESTIONNAIRE                                                           1 of 2



Thank you for your interest in TRENT Products. To assist us in designing and recommending
  a furnace system for you, please complete and return the following questionnaire to us:


  CONTACT NAME                                                                          TITLE
        COMPANY                                                                       PHONE
        ADDRESS                                                                          FAX
                                                                                      EMAIL
             CITY                                       STATE                      WEBSITE
        COUNTRY                                     ZIPCODE

YOUR PRODUCT:
 What TYPE OF MATERIAL will you be processing in this Furnace? (Steel, Brass, Glass, Chemicals,
       Liquid, or Solid, etc.)
  What are the unit QUANTITY. SIZE and WEIGHT, individually and in the aggregate, of the load to be processed,
        including fixtures, clamps, jigs, etc.?


 What is the Specific Heat of the material, if known?

YOUR PROCESS:
 What type of operation will you be performing in this furnace? (ex. Annealing, Drying, heat treating, etc.)


 In order for us to understand the temperature requirements of your process, please provide the following:
          (If not applicable, please indicate N/A)
    Normal Operating Temperature                        °F                          Maximum Temperature                   °F

    Temperature Uniformity                   ±°F                          In What Size Cube?

    Will the batch be at room temperature when loaded?              YES       NO        If NO, what temp.?                °F

    Will the batch be placed in a cold furnace?          YES       NO              If NO, what oven temp.?                °F

    What is your desired production rate? (Units / Hour or Shift , Lbs. / Hour, etc.)

    What is your desired HEAT-UP TIME to control point? (Minutes, Hours))
    Process Duration                                                          Desired Product End Temp.                   °F

    Does this process require a blower for purging, forced air exhaust or rapid cool-down?            YES       NO

    Are flammable, explosive, toxic or noxious vapors or fumes produced from your process?                YES        NO
         If YES, in what concentration?

    Is your product or process corrosive to metals?          YES     NO

    Does this process require a controlled atmosphere?             YES      NO     What type?

    How will the material be LOADED or STACKED? (ex. baskets, trays, etc.)




                    TRENT, Inc., 201 Leverington Avenue, Philadelphia, PA 19127
   Phone: 800-544-TRENT FAX: 215-482-9389 Website: www.trentheat.com      Email: trentheat@aol.com
                                        FURNACE QUESTIONNAIRE                                                      2 of 2



THE FURNACE:
  What ELECTRICAL SERVICE is available?                        Voltage            Phase               Amps               Hz

  How much FLOOR SPACE is available?                             Width                 Height                Depth

  What interior CHAMBER SIZE do you require?                     Width                  Height                   Depth

  TRENT furnaces are standard for bench or floor mounting with or without legs.

  Do you require a muffle?        YES     NO                What is the Maximum Load Weight?

  Most TRENT furnaces are without forced air recirculation, however certain models are available with this
        feature. Do you require recirculated airflow?         YES    NO

  Do you want the furnace controls mounted on the left side or right side when facing the furnace, or remotely
       mounted apart from the furnace?             Left Side      Right Side     Remote Mounting

  When do you require DELIVERY of this Furnace?

  What type of CONTROL INSTRUMENTATION is desired?:                                BRAND PREFERENCE
      ON/OFF PID Control
      Proportional PID Control with SCR Power Controller
      Programmable Controller for Ramp and Soak
      Chart Recorder
      Overtemperature Protection
      Indicating Lights, Alarm Bells, etc.
      Other (Indicate in space provided)



 ADDITIONAL COMMENTS:




USE THIS AREA TO SKETCH ANY PERTINENT DIMENSIONS:




                     TRENT, Inc., 201 Leverington Avenue, Philadelphia, PA 19127
    Phone: 800-544-TRENT FAX: 215-482-9389 Website: www.trentheat.com      Email: trentheat@aol.com

				
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