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If the display value of the anti-corrosion thermal resistance display meter is lower than the actual value or the indication value is unstable, then it may be that the protection tube is dirty, so the dirt can be mainly removed. However, if the indication has a negative value, it may be a thermal resistance wiring error or a thermal resistance short circuit, so you can continue to use it as long as you correct the wiring and handle the short circuit.
In addition to the short circuit and open circuit problems, the thermal resistance is in use, and there are several common faults:
The following analysis of four common fault phenomena and treatment methods:
1. Fault phenomenon: The indication value of the display thermal resistance is lower than the actual value or the indication value is unstable;
Possible causes: metal chips, dust, dirt between the terminals and short circuit of the thermal resistance in the protection tube;
Treatment method: remove metal shavings, clean dust, water droplets, etc., find the short-circuit point to strengthen the insulation.
2. Fault phenomenon: the table of the thermal resistance indicates infinity;
Possible causes: short circuit of the thermal resistance or lead wire or loosening of the terminal;
Treatment method: replace the resistor body or weld and tighten the terminal screws.
3. Fault phenomenon: the display meter indicates a negative value;
Possible causes: the display instrument and the thermal resistance wiring are wrong or the thermal resistance is short-circuited;
Treatment: Correct the wiring, or find the short circuit and strengthen the insulation.
4. Fault phenomenon: the relationship between the thermal resistance value and the temperature changes;
Possible cause: The thermal resistance wire material is corroded and deteriorated;
Treatment method: Replace the thermal resistance.
In general, the resistance is smooth in the application process, but sometimes it may occur, and the most common ones are open circuit and short circuit. The open circuit is usually caused by the heat resistance wire being too thin. Let's take a brief look at the short circuit and open circuit problem handling method of the thermal resistance.
Open circuit and short circuit are generally easy to judge, just a multimeter. That is, the measurement is performed with the "×1 Ω" file of the multimeter. If the measured resistance is less than R0, it may be a short circuit; if the measurement indication is infinite, then the open circuit can be determined. The short circuit is easier to handle, as long as it does not affect the length and thickness of the resistance wire, find the short circuit to dry and strengthen the insulation. If it is an open circuit, then the length of the resistance wire must be changed during processing, which will affect the resistance value. Therefore, only replace the new resistor body, but if welding repair is required, it must be verified after welding.
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