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Parallel Trace Heating

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					                                                      Parallel Trace Heating
                                                      self-regulating electrical trace heating




                                                      Electrical trace heating is applied to maintain
                                                      temperatures of vessels, pipes, valves,
                                                      gutters and instrument panels. It is widely
                                                      used in various industries for freeze
                                                      protection, preventing chemicals from
                                                      crystallizing or solidifying, maintaining low
                                                      viscosity for easy pumping and to maintain
                                                      liquids at optimum process temperatures.
                                                      It is used in cabinets and instrument panels
                                                      to prevent condensation and to prevent
                                                      drain pipes and doors in refrigeration plants
                                                      from freezing up.

                                                      Trace heating cable is normally applied to
                                                      the outside surface of the container/pipe
                                                      which is then covered with insulating
                                                      material. Certain types can also be
                                                      immersed into liquid.




Parallel trace heating cable


 Parallel trace heating cable consists of two
 parallel conductors (phase, neutral) with a
 conducting material in between. The
 conducting material produces even heating
 power (Watts/m) over the entire length of
 the cable. On modern cables the resistance
 of the material increases as the operating
 temperature rises, resulting in a reduction
 of heating power. It is thus termed “self
 regulating trace heating cable”. For safety
 reasons it is not recommended to exceed
 the design wattage.

 The advantage of this cable is that it can be
 cut to any length with the termination being
 at one end of the cable and is easy to
 terminate




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Electrical trace heating

 Parallel trace heating cable (self-regulating)
                     ELSR--BO (BOT)
                             Overjacket       Earth braiding, tinned copper   Insulation                        Self-Regulating heating element   1,25 mm2 Buswires




                     ELSR--AO
                             Overjacket       Earth foil, aluminium           Insulation                        Self-Regulating heating element   1,25 mm2 Buswires




                     ELSR-N                                                                                     ELSR-H
                51                                                                                         70
Loading (W/m)




                                                                                           Loading (W/m)
                       EL




                48
                         SR




                45
                            - N-




                                                                                                           60
                                  40




                42
                                                                                                                                 EL
                39                                                                                                                  SR
                                                                                                                                       -H-
                        EL                                                                                                                  60
                36          SR                                                                             50
                               -N
                33                 -3                                                                                           ELS
                                        0                                                                                             R-H
                30     EL                                                                                                                 -45
                            SR                                                                             40
                                 -L-
                27                  25
                       EL
                24          SR
                                 -N                                                                        30                   ELSR
                21                  -2                                                                                                 -H-30
                                        0
                18
                15                                                                                         20                   ELSR
                       EL                                                                                                                -H-20
                           SR
                12               - N-
                                        10
                 9
                                                                                                           10                   ELSR-H-1
                                                                                                                                             0
                 6
                 3

                 0     5     10 15 20 25 30 35 40 45 50 55 60 65                                           0       10 20 30 40 50 60 70 80 90 100 110 120
                     Surface temperature on insulated metal pipes (°C)                                      Surface temperature on insulated metal pipes (°C)

                                                                                                                                 ELSR-L/N              ELSR-H
       Max. Exposure Temperature (unpowered)                                                                                     80°C                  200°C
       Max. Exposure Temperature (powered)                                                                                       65°C                  120°C
       Nominal Voltage                                                                                                           230V                  230V
       Minimum bending radius                                                                                                    25mm                  25mm


 Standard stock items:
            stock code                                                        description
            self regulating parallel heat tracing cable:
            55°C (Powered)
            RHD-ESR-R-27                                                      27W/m at 0°C/                        without braiding, circular
            65°C (Powered)
            RHD-ELSR-L-25-P                                                   25W/m at 10°C,                       plain
            RHD-ELSR-L-25-AO                                                  25W/m at 10°C,                       with earth foil and overjacket, flat
            RHD-ELSR-N-30-P                                                   30W/m at 10°C,                       plain
            RHD-ELSR-N-30-AO                                                  30W/m at 10°C,                       with earth foil and overjacket, flat
            RHD-ELSR-N-40-P                                                   40W/m at 10°C,                       plain
            RHD-ELSR-N-40-AO                                                  40W/m at 10°C,                       with earth foil and overjacket, flat
            RHD-ELSRY0116A                                                    Termination Kit for ELSR-N (L) low temperature trace cable
            120°C (Powered)
            RHD-ELSR-H-45-P                                                   45W/m at 10°C,                       plain
            RHD-ELSR-H-45-BOT                                                 45W/m at 10°C,                       with braiding and teflon overjacket
            RHD-ELSR-H-60-P                                                   60W/m at 10°C,                       plain
            RHD-ELSR-H-60-BOT                                                 60W/m at 10°C,                       with braiding and teflon overjacket
            RHD-ELSRY0116B                                                    Termination Kit for ELSR-H high temperature trace cable




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