The common thermal resistance is the most commonly used temperature detector in the middle and low temperature area. It is not only widely used in industrial measurement, but also made into a standard reference thermometer. The following analysis of four common fault phenomena and handling methods:
1. Fault phenomenon: the indicated value of thermal resistance is lower than the actual value or the indicated value is unstable;
Possible causes: metal chips, dust, dirt between terminals and short circuit of thermal resistance in the protection pipe;
Treatment: remove the metal chips, clean the dust, water drops, etc., and find the short circuit point to strengthen the insulation.
2. Fault phenomenon: the indicator of thermal resistance is infinite;
Possible causes: short circuit of thermal resistance or lead wire, loose terminal, etc;
Treatment: replace the resistance body or weld and tighten the wiring screws.
3. Fault phenomenon: display instrument indicates negative value;
Possible causes: wrong wiring between display instrument and thermal resistance or short circuit of thermal resistance;
Treatment: correct the wiring, or find out the short circuit, strengthen the insulation.
4. Fault phenomenon: the relationship between thermal resistance and temperature changes;
Possible causes: corrosion and deterioration of thermal resistance wire material;
Treatment: replace the thermal resistance.

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