Non Contact Infrared Thermometers for the Glass Industry by kdq54459


									             Non Contact Infrared Thermometers
             for the Glass Industry

                                                   The Glass Industry

    Glass manufacturing was one of the first industries to use non-contact
    temperature measurement. Many of today’s non-contact infrared sensor
    designs evolved directly from the needs and demands of the diverse, and
    many times harsh processes entailed in the making of glass products in
    their various forms.

    Mikron Infrared Inc. has been closely engaged in the creation and design
    evolution of non-contact temperature sensors for the Glass Industry for        Melt tank/forehearth

    over 35 years. Mikron’s sensor specifications and protective housing
    designs are in direct response to the special needs of the Industry,
    and have progressively taken advantage of the dramatic strides in optics,
    electronics and detector technology.

    Today, Mikron infrared thermometers are to be found globally, in all
    segments of both primary and secondary glass manufacturing:
                                                                                   Non-contact IR fiber optic
    • Automotive and Architectural          • Decorative and Tableware             sensors located on top of

    • Container and Fiber                   • Optical Waveguide Production

    • Lamp and Lighting                     • Tempering, Laminating and Forming

    The company now offers the world’s most comprehensive, single-source
    array of fixed mounted and portable non-contact infrared thermometers,
    along with hand held and fixed thermal imaging systems. In support of its
    sensors, Mikron also has a range of calibration standards and services that
    provide traceability, referenced to national standards.                        IR Fiber Optic Sensor installed near
                                                                                   glass gob distribution (exit of forehearth)

    The following pages will provide you with an overview of Mikron products for
    the Glass industry, and of applications that have been successfully engi-
    neered. More detailed product information, or the location of your Mikron
    representative, can be found on our website at

                                                                                   Glass gob distributor

    IR Sensor measuring temperature of glass gob                                   Glass bottle forming line

                                Float Glass Process Applications

        Melting & Refining
        The melt tank (1) and refiner area temperature meas-           fiber optics are used in this area. Due to the extreme
        urement applications are common to many segments               environmental temperatures, water cooling is neces-
        of the Industry. The measurement locations are: The            sary for non-fiber optic models. Fiber optic models are
        furnace crown, the bridgewall, the burner port block,          used when water cooling is not desirable. Single wave-
        and the molten glass in the regenerator melt tank furnace.     length (1 color) pyrometers are used throughout the
        Sensors in the region of 1µ (micron) with and without          Float Glass Process.

        Float Glass
        After the melt tank (1), the first points of measurement       In the Annealing Lehr (4), again sensors in the 5µ
        on Float Glass lines are in the Canal Area (2) followed        region are installed to sense near the edge and the
        by the Tin Bath (3), which requires multiple measure-          center of the glass ribbon in each of the annealing
        ments to profile the glass. The Canal Area uses a              zones. In the Cooling Zones near the end of the Lehr,
        pyrometer with a 1µ spectral response. Generally a             and to determine the correct ribbon temperature in the
        fiber optic sensor is preferred. Sensors in the 5µ spec-       glass cutting location (5), more economical sensors
        tral response region are used here to sense the glass          with 8-14µ spectral response can be used.
        surface temperature.

                                        2   Canal Area

                                                 3                                4

Melt Tank
                             Tin Bath

                                                                 Annealing Lehr

                                                                                          Lehr Exit

                                                                                                              Glass Cutting Area

        Bending, Tempering and Sagging
        In the bending, tempering and sagging applications             Other spectral responses have been used to measure
        associated with the secondary processing of flat glass,        temperatures just below the glass surface as a means
        sensors in the region of 5µ are used to measure glass          of preventing “skin effect” stress patterns.
        surface temperature.

                       Container & Fiber Glass Process Applications

    Container Glass and Fiber Glass
    Container and fiber glass lines have common features in that                 response are used to sense each zone temperature, and meas-
    they both have a melt tank refiner area and a Distributor with               ure approximately 25mm (1”) into the glass. On some fore-
    several Forehearths. Normally, fiber glass forehearths are longer            hearths, zone temperature is combined with an additional IR
    and therefore have more zones than the container line                        thermometer, sighted into a molybdenum tube through the bot-
    equivalent. In the Distribution Area (2) IR sensors in the region of         tom of the forehearth, just before the orifice, to detect tempera-
    1µ wavelength are used to measure just below the surface of the              ture gradients in the glass.
    glass at one or more points. Due to extremely hot environmental              At the end of the glass conditioning phase in the forehearth, the
    conditions, fiber optic models are preferred.                                container and fiber glass processes differ.
    In the Forehearth (3), again fiber optic sensors with 1µ spectral

    Container Lines
    The end point of measurement on a container forehearth is the                In the Parison Forming area, Mold temperature (6) is measured
    Gob (4). Gob temperature measurement requires a sensor with                  with a fixed sensor system and/or a portable M90QFO
    1µ spectral response to sense beneath the gob surface in order               Thermometer. The M90QFO employs a stainless steel fiber optic
    to avoid surface cooling effects. For very small gobs, less than             “wand” terminating in a “cupped” tip. This allows an operator to
    25mm (1.0”) dia., it is necessary to sight up into the orifice to            momentarily touch the mold surface and record up to 40 read-
    avoid “seeing” partially through the glass. Generally, IR sensors            ings that can be downloaded and analyzed on a computer. A
    with fiber optic, or non-fiber optic versions with through-lens              short wavelength spectral response minimizes emissivity varia-
    sighting or video are used in this location.                                 tions due to mold age or doping, and in the case of the
    Single color with short wavelength or 2 Color sensors with                   M90QFO, the cupped tip eliminates reflected energy from hot
    through-lens sighting are used for the Plunger (5) measurement               glass or other molds in the vicinity. Additionally, fixed process
    to eliminate inaccuracies due to variable surface emissivity.                sensors with a spectral response of 3.9µ or fiber optic models
    Typically sensors with a speed of response of 10 milliseconds or             with1.8µ are used to see through clean flames impinging on the
    less are used for gob or plunger temperature measurements.                   molds.

                                                        2    Distribution
                                                             Area                                    Plunger
                                                                                             Gob       5
       1   Melt Tank                                                                           4                      6
                                                                                                                           Blank / Mold

                                            3   Forehearth
                                                                                             Forming Area
    Fiber Glass
    In fiber glass production, the last point of measurement of the              the molten glass to flow. For this measurement, portable or
    forehearth, is at the Platinum Bushing (4). A variety of techniques          fixed systems with narrow-band, short wavelength spectral
    have been used in this final production stage to ensure that                 response or two color thermometers are used. All non-contact
    correct temperature and temperature distribution across the                  infrared thermometers avoid the errors attributable to electrical or
    bushing is maintained. This insures that the holes in the bottom             electro-magnetic interference that complicate thermocouple
    of the Platinum Bushing remain open and unobstructed, allowing               measurements.

                          1   Melt Tank
                                                    2    Distribution

                                                                            3   Forehearth
                                                                                                                           UPWARD VIEW OF
                                                                                                                          PLATINUM BUSHING
                                                                                        4      Platinum Bushing

                           Lamp & Lighting Process Applications

                                                                                   3 measuring points
    1                                            Vello/Danner Process Area                                                                        2
                                                                                   1) Glass Temp
Melt Tank                                                                             coming out of the orifice                                   3
(Not Shown)                                 3                                      2) Glass on Sleeve
                                                                                   3) Glass on nose

                                                                                                                                           5   Sealing Area


                                                               Cutting/Coating Line

                                                                                                                        Tube Carousel

Like Container and Fiber Glass production, Lamp and Lighting only differs in the forming and
secondary manufacturing stages. Depending on the glass materials under process such as soda
lime, lead glass or borosilicate (quartz) temperatures vary, ranging from approximately 500°C to
2200°C respectively. Mikron’s Line of IR Sensors at 5 micron spectral response are used to
measure glass/quartz surface temperature, whether it is viewed directly or through clean flames.
In the case where the glass is luminous, (molten glass), an IR Sensor with a 1 micron spectral
response should be used.                                                                                             Fluorescent tube Glass to Lead
                                                                                                                     Glass Sealing Process – Tube

                           Glass to Glass, Glass to Metal, Sealing Applications

               Accurate automotive lamp                      Temperature measurement is                     Mikron Infrared Sensors are
               glass temperature measurement                 used to control and prevent a                  used to measure glass to lead
               prevents seal failure and Pinch               cold seal, rod voids, cracking,                glass seal on fluorescent tubes.
               Die breakage due to low glass                 and shrinkage.

Mikron’s non-contact infrared temperature sensors are ideal for monitoring and control of critical processes in the manufacture of
incandescent bulbs, fluorescent tubes (mercury/sodium vapor) metal halide and high intensity discharge lamps. Mikron has a
variety of products available for lamp/bulb flame sealing, bending, annealing and forming applications including the models M67S
with through lens sighting, MI-N5/5+, with laser sighting and the M67SV which has video monitoring capability. For checking filament
temperature choose from the M770S a fast, highly accurate Digital 2-color sensor with variable focussing optics or M770SV which
incorporates video capability. The fiber optic model M780 is used in harsh and confined areas. In addition single color fiber optic
sensors can be used to measure pinch die temperature, to reduce breakage in automotive lamp glass applications.In addition, the
IR Sensor’s speed of response should be considered due to the very high speed nature of the Lamp/Lighting Glass Process.

           Mikron IR Products for Glass Industry Applications

           Materials             Measurement Points                  Mikron Models

                                        Melt Temp.           M67S(H)        MI-S200          Fiber Optic Models
                                        Canal Area           M190H          MI-S300
                                                         1                                   M668
    Molten Glass or Refractory       Distribution Area       MI-S5          Portable
                                                         µ                                   M680(H)
                                        Forehearth           MI-S5-TV       M90H
                                            GOB              MI-S10                          MI-S50-LO-GL

                                                             M67S(E)              MI-N200/5
                                         Tin Bath            MI-N5/5              MI-N300/5
                                           Lehr          5
    Non-Molten Glass Surface              Lamps
                                                             MI-N5/5+             Portable
                                                         µ                        M90(E)
                                          Bulbs              MI-N5/5-M+

                                                             M67S(H),(Q),(D)      MI-GA10             M90QFO
                                                                                                      Fiber Optic Models
                                                             M190(H),(Q)          MI-GA140
                                         Blanks                                                       M68
                                          Molds              MI-S5                MI-S140
          Metal Surface                 Plungers         1   MI-S5-TV             MI-P140             M680(H) (IN)
                                        Pinch Die        µ   MI-GA5               MI-S200             MI-S5-LO
                                                             MI-GA5-TV            MI-GA200            MI-S50-LO-GL
                                                             MI-S10               MI-S300             MI-SQ10-LO
                                                             MI-GA10              MI-GA300            MI-GAQ10-LO

                                                             M770SV (Video Output)
        Tungsten Surface                 Filament            M9103 (High Resolution Thermal Imaging System)

               Mikron Products for Glass Industry Applications

MI-N300/5                             MI-N200/5                            MI-N5/5 MI-N5/5+                   MI-N5/5-M+ MI-N5/5-H+
Glass surface measurement,            Glass surface measurement,           Glass surface measurement,         Glass surface measurement, high
2-wire design, 5.14µm spec-           (2-wire loop powered design)         digital pyrometers with analog     speed version of MI-N5/5+ with
tral response and 100ms               with service interface.              and digital outputs, 5.14µm        30ms and 10ms response times,
speed of response.                    Programmable measuring               spectral response, 80ms            laser aiming, spectral range 5.14µm.
                                      range, 5.14µm spectral               response time, laser aiming.
                                      response and 120ms speed
                                      of response.

MI-S300 MI-GA300                      MI-S200 MI-GA200                     MI-S5 MI-GA5                       MI-GA140 MI-S140
Good value, small, fast               Fast (20ms), medium/high             Very fast (2ms) digital pyrome-    Highly accurate, fully digital fast
(10ms), medium/high tem-              temperature, digital pyrome-         ters with analog output and        pyrometer for temperatures
perature, 2-wire pyrometers           ters with analog output,             digital interface. Maximum         between 300 and 3300°C.
with fixed focus, adjustable          2-wire design, maximum               value storage, adjustable          Response times <1ms optional
emissivity and LED aiming,            value storage, programmable          measuring range, laser aiming      500µs, thru-lens viewfinder or laser
easy installation.                    measuring range, LED aiming.         or through-the-lens sighting       targeting. Built-in digital display with
                                                                           or integrated TV camera.           temperature indication.

MI-S50 LO/GL MI-S5 LO/GL              M67S E, D, H                         M68, M668                          M680 H
Fiber optic pyrometers for            Diversified industrially hardened    Fiber optic models for non-con-    Multi-channel ultra precision fiber
measurement of molten glass           pyrometer with precision upright     tact temperature measurement       optic system. Wide range digital
for forehearth, feeder and gobs.      through lens sighting, focusable     of inaccessible locations where    pyrometer with precision optics.
Adjustable measuring ranges,          optics, adjustable emissivity and    direct sighting is impossible or   Digital output, optional 4-20 mA
2-wire design, analog output          easy 2-wire installation with 4-20   where exceptionally high ambi-     analog output, long stainless steel
(service interface).                  mA analog output. Speed of           ent temperatures exist or EMI or   sheathed fiber optic cable lengths
Digital with adjustable meas-         response 100ms/100ms/10ms.           RF interference is a problem.      and 50ms response speed.
uring ranges with 250ms and                                                Speed of response 10ms and
2ms respectively                                                           50ms respectively.

M190 H, Q                             M90 H                                M90QFO                             M770S
Digital pyrometer with precision      High accuracy hand-held for          Portable, specifically designed    Digital 2/color pyrometer with
focusable optics, 0.1°C resolution,   spot checks or tripod mounted        for rapid, easy and convenient     precision focusable optics,
analog outputs, and adjustable        for rapid and dependable data        measurement of mold surface        adjustable slope, alarm relay and
emissivity. Designed for precision    gathering. Variable focus optical    temperatures between 300° and      temperature display for temperature
process applications. 50ms speed      system allows for precision          1500°C. This instrument avoids     range 1112°F to 6332°F. Powerful
of response.                          pinpointing of small targets.        errors caused by mold surface      software for process diagnostics.
                                      200ms speed of response.             emissivity and reflected energy.   4-20mA and RS485 outputs.
                                                                           100ms speed of response.

                                             Protective Hardware

Mikron infrared sensors are inherently rugged and reliable, but for long term accuracy and reliability, the
optics must remain clean and the electronics must not be subjected to conditions exceeding ambient temper-
ature specification limits. Mikron's
extensive range of protection
and mounting accessories make
installation simple, keep mainte-
nance to a minimum and ensure
optimum performance in the harsh
process environment of glass
                                             Protective Cooling Jacket                 Air Purge & Water Cooling Jacket
                                             with air purge and aiming flange assembly for MI-200 or MI-N200/5 Sensors
                                             for models M67S and M770S Series

Stainless Steel Protective cooling          Air Purge & Water Cooling Jacket Air Purge for MI-300/5
jacket with integrated air purge for        for MI-300/5
MI-N5/5+ Sensors

Air Purge Mini Assembly                      Air Purge Assembly                          Air Purge with mounting bracket and
for fiber optic models M68 and M668          for fiber optic models M68 and M668         ceramic/ inconel sight tube for MI-S50-
                                                                                         LO-GL and MI-S5-LO-GL

Programming Module                          Scanning Mirror Assembly                          M300
Model MI-HT6000 for setting MI-Series       MI-SCX Series                                     For calibration of all infrared glass
sensor parameters                                                                             industry sensors ranging from
                                                                                                                                             0603 Glass Print Rev 1.0 020904

                                                                                              200º C to 1150ºC.
                           Mikron Infrared, Inc., Headquarters        West Coast Office:                    Visit our websites:
                           16 Thornton Road                           Mikron                      
                           Oakland, NJ 07436 USA                      4475 Dupont Court #9        
                           Tel:            201-405-0900               Ventura, CA 93003
                           Tel: (USA only) 800-631-0176               Tel:     805-644-9544
                           Fax:            201-405-0090               Fax:     805-644-9584                 0603 Glass Rev. 0
                           E-mail:   E-mail:                 Printed in USA        ISO 9001

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