Thermocouple input part failure performance

Thermocouple is a kind of instrument for measuring temperature. It has the advantages of reliable performance, good mechanical strength, long service life and convenient operation. It is often used in many fields, such as ceramics, food, medical, power plants and other industries. However, during use, factors such as temperature, humidity, and operational errors can cause errors in the thermocouple measurement, and these errors can occur in different parts of the thermocouple, such as the thermocouple input and output. Then, Xiaobian will introduce the performance of the thermocouple input part failure.

1. According to the wiring diagram of the instrument, after correct wiring, the meter first displays the thermocouple index number of the meter, then displays the range of the meter range, and then measures the set temperature of the digital tube in the lower row of the meter. The digital tube on the meter displays the measured temperature. . If the digital tube on the meter displays the temperature of the heating element and displays the status of “OVER”, “0000” or “000”, it indicates that the input part of the instrument is faulty.

Second, according to the wiring diagram of the instrument wiring is correct, if the instrument is powered, the digital tube on the meter shows a negative value, indicating that the thermocouple "+" and "-" connected to the meter are connected incorrectly. Just re-change it.

Third, the wiring is correct When the instrument is running, the temperature displayed on the digital tube on the meter is different from the actual measured temperature by 30oC~60oC. Even the difference is even larger, indicating that the meter's index number and the thermocouple's index number are wrong.

According to the correspondence between the temperature (oC) and the millivolt (MV) value of the thermocouple with thermocouple indexing numbers B, S, K, E, etc., the millivolt value (MV) generated in the case of the same temperature (oC) The B index is the smallest, the S index number is small, the K index number is larger, and the E index number is the largest. According to this principle, the discriminant is determined.

Through the introduction of the above points, Xiao Bian believes that everyone can understand the performance of the thermocouple input part failure. The failure of the thermocouple input part needs to be solved in time, otherwise it will affect the accuracy of the measurement results and also affect the life of the thermocouple.

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