How many common troubleshooting methods are used for anti-corrosion thermal resistors?

If the displayed value of the anti-corrosion resistance display instrument is lower than the actual value or the displayed value is unstable, it may be due to dirt inside the protective tube, so the main focus is on removing the dirt. But if the indication shows a negative value, it may be a wiring error or a short circuit in the thermistor, so as long as the wiring is corrected and the short circuit is handled properly, it can continue to be used.
In addition to short circuits and open circuits, there are several common faults in the use of thermistors:
Below are four common fault phenomena and their solutions:
1. Fault phenomenon: The indicated value of the thermal resistor is lower than the actual value or the displayed value is unstable;
Possible reasons: Metal shavings, dust, dirt between terminals, and short circuit of thermal resistance inside the protective tube;
Solution: Remove metal shavings, clean dust, water droplets, etc., find the short circuit point and strengthen insulation.
2. Fault phenomenon: The meter of the thermal resistor indicates infinity;
Possible reasons: short circuit of thermal resistance or lead wire, or loose terminal block, etc;
Solution: Replace the resistor or weld and tighten the wiring screws, etc.
3. Fault phenomenon: Display instrument indicates negative value;
Possible reasons: The wiring between the display instrument and the thermistor is incorrect or there is a short circuit in the thermistor;
Solution: Correct the wiring or identify the short circuit and strengthen the insulation.
4. Fault phenomenon: There is a change in the relationship between thermoelectric resistance and temperature;
Possible reasons: Corrosion and deterioration of the thermal resistance wire material;
Solution: Replace the thermistor.
In general, resistors operate smoothly during application, but sometimes faults may occur, with the most common being open circuits and short circuits. And circuit breaks are usually caused by the thermal resistance wire being too thin. Let's briefly understand the methods for handling short circuits and circuit breaks in thermal resistance.
Open and short circuits can generally be easily identified with just a multimeter. If the measured resistance is less than R0 using the "× 1 Ω" range of the multimeter, it may be a short circuit; If the measurement indicates infinity, it can be determined that there is an open circuit. Short circuits are relatively easy to handle, as long as they do not affect the length and thickness of the resistance wire. The short circuit can be found and dried to strengthen insulation. If it is a circuit breaker, the length of the resistance wire must be changed during processing, which will affect the resistance value. Therefore, only a new resistance body can be replaced. However, if welding repair is required, it must be verified to be qualified after welding before use.