Common faults and treatment methods for thermocouples are shown in the following table:
Fault phenomenon
Possible Causes
Approach
The thermoelectric potential is smaller than the actual value (the display meter indicates a low value)
Thermal electrode short circuit
Find out the cause of the short circuit: if the short circuit is caused by moisture, dry the hot electrode is needed; if the short circuit is caused by the insulation damage, the edge needs to be replaced.
Short circuit at the junction of the thermocouple causes short circuit
Sweeping dust
Compensation wire-to-wire short
Find the short circuit point, strengthen the insulation or replace the compensation wire
Hot electrode deterioration
Cut the metamorphic section when the length allows, re-weld, or replace the thermocouple
Compensation wire and thermocouple polarity reversed
Reconnect thermocouple and compensation wire
Compensation wire does not match thermocouple
Replace the matching compensation wire
Cold junction temperature compensator does not match thermocouple
Replace the matching cold forging temperature compensator
Cold junction temperature compensator and thermocouple polarity reversed
Reconnect thermocouple and cold forging temperature compensator
Display instrument is not supported by thermocouple
Replace the matching display instrument
Display meter does not perform mechanical zero calibration
Correct instrument zero adjustment
Improper installation of thermocouple or insertion depth does not meet the requirements
Reinstall as required
The thermoelectric potential is larger than the actual value (the display indicator value is higher)
Compensation wire does not match thermocouple
Replace the matching compensation wire
Display instrument does not match thermocouple
Replace the matching display instrument
Cold junction temperature compensator does not match thermocouple
Replace the matching cold junction temperature compensator
DC interference signal
Find interference sources and eliminate DC interference signals
Thermoelectric potential output is uncertain
Poor contact between thermocouple terminal and hot electrode
Tighten the terminal screws
Thermocouple measurement line insulation damage, causing intermittent short circuit or grounding
Find the point of failure and restore insulation
Thermocouple is not installed securely or externally
Fasten the thermocouple, eliminate vibration or use vibration reduction measures
The hot electrode will be broken
Repair or heat exchange galvanic couple
External interference (such as AC leakage, electromagnetic field, etc.)
Identify sources of interference and take shielding measures
Large thermal potential error
Hot electrode deterioration
Replace the thermocouple
Thermocouple installation location is improper
Replace the installation location
Protective casing surface area ash
Eliminate dust
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