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Common faults and treatment methods of thermal resistance
The common thermal resistance is the most commonly used type of temperature detector in the low and medium temperature areas. It is not only widely used in industrial measurement, but also made into a standard reference thermometer. The following analyzes four common failure phenomena and treatment methods:
1. Failure phenomenon: The indicated value of the displayed thermal resistance is lower than the actual value or the displayed value is unstable;
Possible reasons: metal shavings, dust in the protection tube, dirt between the terminals, and thermal resistance short circuit;
Treatment method: remove metal shavings, clean dust, water droplets, etc., find short-circuit points to strengthen insulation
2. Failure phenomenon: The table of thermal resistance indicates infinity;
Possible reasons: short circuit of thermal resistance or lead wire or loosening of terminal;
Treatment method: Replace the resistor or solder and tighten the wiring screws.
3. Failure phenomenon: display instrument indicates negative value;
Possible cause: The wiring of the display instrument and the thermal resistance is wrong or the thermal resistance has a short circuit;
Solution: Correct the wiring, or find the short circuit, and strengthen the insulation.
4. Failure phenomenon: There is a change in the relationship between the thermal resistance value and the temperature;
Possible cause: Corrosion and deterioration of thermal resistance wire material;
Solution: Replace the thermal resistor.