How to handle thermocouple input errors

Thermocouple is a commonly used temperature measuring instrument, which has certain applications in various industries such as power, petroleum, medical, aviation, etc. Users often encounter many achievements due to input errors when using thermocouples. So, how should these achievements be handled? Below, we will explain the methods for handling thermocouple input errors.

A) Remove the thermocouple from the input end of the instrument thermocouple and short-circuit the input end of the instrument thermocouple with any wire. When powered on, if the display value of the digital tube on the instrument is about room temperature, it indicates that the external connection of the thermocouple is open, and the same example thermocouple should be replaced. If the above state persists, it indicates that the input end of the instrument was damaged during transportation and needs to be replaced.

B) Remove the thermocouple of the above-mentioned faulty instrument and replace it with the thermocouple connected to the same type of scale instrument with abnormal operation nearby. After powering on, if the digital tube on the upper row of the faulty instrument shows a fever temperature, explain that the external connection of the thermocouple is open, and replace it with the thermocouple of the same example. If the above state persists, it indicates that the input end of the instrument was damaged during transportation and needs to be replaced.

C) Remove the faulty thermocouple from the instrument, use a multimeter to measure ohms (R) * 1, and use two multimeter sticks to measure the two ends of the thermocouple. If the resistance value displayed on the multimeter is very high, it indicates that the external connection of the thermocouple is open, and replace it with the same example thermocouple. Otherwise, if there is a certain resistance value, it indicates that the input terminal of the instrument has a performance, and the instrument should be replaced.

D) According to the instrument wiring diagram, the wiring should be accurate. If the digital display on the upper row of the instrument shows negative values or other phenomena after the instrument is powered on, it should be clarified that the thermocouple "+" and "-" connected to the instrument are incorrectly connected and can only be replaced.