Q&A on Thermocouples and Compensation Wires: What happens if the polarity of the thermocouple is wired incorrectly?
I will answer questions regarding the case of wiring the polarity of the thermocouple (compensating wire) incorrectly!
The color code for thermocouples and compensation wires varies significantly by country’s standards, which can lead to mistakes in polarity during wiring work. What is the temperature indication in such cases? A: The connection point between the thermocouple and the compensation wire is often at the terminal box or junction box that comes with the thermocouple, and this connection point is frequently at ambient temperature. Therefore, if the connection from the terminal box to the receiving instrument's terminal is made with the polarity reversed, the temperature difference between the terminal box and the receiving instrument's terminal will affect the error. If there is no temperature difference between the two, there will be no error; however, in summer or winter, the temperature difference can become very large, potentially resulting in an error of over 10°C. As an extreme example, if the terminal box reaches 40°C in summer and the receiving instrument is at 20°C, for a type E thermocouple, if the polarity is correct, it would generate a thermoelectric voltage of 2420μV at 40°C and 1192μV at 20°C, resulting in a difference of 1228μV. *For more details, please refer to the PDF document or feel free to contact us.*
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