There are 5 possibilities if the thermocouple doesn’t work stable:
1. Bad contact for terminal and thermal electrode:
Solution: clean the terminal and thermal electrode retighten.
2. Insulation fails which may bring intermittent short circuit and ground connection.
Solution: find the fault point, repair the insulation.
3. Intermittence of the thermode or measuring therminal.
Solution: If the break point is on the measuring therminal, the break point should be welded ,or change the thermocouple.
4. insufficient installation or external vibration.
Solution: Anti-detonation measures to install the thermocouple firmly.
5. External disturbance:
Solution: Examine the interference source
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