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Technical Information

cracked appearance, usually accompanied by considerable discoloration or swelling. In some cases, the metal will be eroded, or partially eaten away. High temperature thermo- couples of a noble metal (platinum) or the exotic type usually do not exhibit much visible evidence of deterioration (or contamination as it is sometimes called). However, the platinum type thermocouples will sometimes have a frosty texture rather than a shiny surface on the wires of the element. The deteriorated couple must be replaced.

Problem

Symptom

Possible Cause

Process Overheating

Temperature indicator showing above setpoint. Heat "on" light not lit.

• Contactor • Solenoid Valve

  • Power Controller

  • Reactor

  • Heating Element

  • Current to Position Converter

  • Motor Operator

  • Valve

  • Burner

  • Temperature Controller

  • Thermocouple and Leadwire

  • Temperature Controller

Temperature indicator setpoint. Heat "on" lig

showing above ht is lit.

Temperature indicator Heat "on" light cycling

showing setpoint. on and off.

Temperature indicator setpoint. Heat "on" lig

showing below ht is lit.

Temperature indicator setpoint. Heat "on" lig

showing below ht is not lit.

Temperature indicator setpoint. Heat "on" lig

showing below ht is lit.

Process Insufficiently Heating

  • Temperature Controller

  • Controller

  • Contactor

  • Solenoid Valve

  • Power Controller

  • Reactor

  • Heating Element

  • Current to Position Converter

  • Motor Operator

  • Valve

  • Burner

Temperature indicator showing setpoint. Heat "on" light cycling on and off.

• Controller • Thermocouple and Leadwire

Process Control Temperature Wide Cycling

Temperature indicator showing setpoint. Heat "on" light cycling on and off.

• Thermocouple and Leadwire • Controller • Contactor

1110-PD-001-0-00

  • Solenoid Valve

  • Power Controller

  • Reactor

  • Heating Element

  • Current to Position Converter

  • Motor Operator

  • Valve

  • Burner

Barber-Colman Company, Loves Park, IL.

Page 8-3

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