Here is a guideline to test thermocouple problems and thermometers of resistance to detect various fault types and help you fix it.

Sensors may also crack or fail in harsh conditions. You may suffer from occasional loss of the thermocouples, or the devices may display "Open Circuit." The first hint that perhaps a thermocouple or pt100 sensor is not operating correctly should come from the device to which it is attached. The readings can appear lower or higher than anticipated, or the instrument may emit an error code. Tools which are connected to a thermocouple or pt100 are also used

Be a temperature monitor or an interpreter.

Depending on the manufacturer and pattern, specific errors on a device can indicate various stuff. Review the temperature meter manual to ensure the sensor itself is not malfunctioning.
Whether your Temperature controller is a thermometer with resistance switching the leads -ve and + ve would have little impact on testing.

Thermocouple levels shift when leads aren't properly paired. When -ve and + ve leads are switched between a thermocouple and a device, the reading may change according to the ambient temperature, e.g., a recording of 100 ° C at 25 ° C temperature would read as 75 ° C unless the lead is not linked correctly. Ensure the -ve thermocouple leading and + ve thermocouple lead are connected to the device successfully.

Empty wired compensating wire

Incorrect thermocouple cable wiring may be further complicated as thermocouples frequently use compensating cables. You may need to check on Panel view repair too. This could be because the thermocouple is wrongly connected to the compensating tube.

Uses the wrong type of compensation.

Additionally,-compensating cable is connected to a different form of the thermocouple. To maintain precision, you only need to use the same kind of paying cable, e.g., a thermocouple of way K should only be replaced with a compensating cord of type k. Many cable styles, such as standard instrument cable, or copper wire, are often used to stretch thermocouples, which often causes errors.

Usage of the cable to cope in extreme temperature conditions.

The last quirk of compensating cable is that it can not be used in conditions with high temperatures. The thermocouple compensating cable is ranked as being lower than the thermocouple cable. Start utilizing the compensating cable to top errors in ambient temperatures.

Test nearby sources of heat

When your thermocouple reads fast, it may be that your sensor is very close to electricity. Unless your sensor is near to a nearby heat source, the temperature is calculated will increase as compared to the location you want to measure temperature.