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Temperature compensation of thermocouple reference junction

by:Sure     2021-08-12
1. Compensation wire In power plants, the temperature of the reference terminal of the thermocouple often cannot be maintained at 0°C, or even fluctuates. In order to avoid the influence of temperature fluctuations at the reference terminal, the compensation wire is usually connected to the thermocouple to extend the reference terminal of the thermocouple to A place far away from the thermocouple and the temperature is relatively stable. This saves expensive thermocouple materials. Precautions for use n Various types of compensation wires should be used 1. Compensation wires In power plants, the temperature of the thermocouple reference terminal often cannot be maintained at 0°C, or even fluctuates. In order to avoid the influence of temperature fluctuations at the reference terminal, compensation wires and thermoelectrics are usually used. Couple connection, extend the thermocouple reference end to a place far away from the thermocouple and the temperature is relatively stable. This saves expensive thermocouple materials. Precautions for use n Various types of compensation wires should be matched with thermocouple types. That is, the thermoelectric characteristics of the thermocouple are the same in the lower temperature range. Such as: platinum-rhodium 10-platinum thermocouple with copper-copper-nickel alloy wire, nickel-chromium-nickel-silicon thermocouple with copper-constantan, nickel-chromium-copper thermocouple with nickel-chromium-copper. n Compensation wires are divided into positive and negative poles. When in use, the positive and negative poles cannot be reversed, otherwise not only will it not be able to compensate, but it will also cause greater measurement errors. 2. The compensator only uses the compensation wire to extend the reference terminal, which cannot stabilize the temperature of the reference terminal of the thermocouple. Therefore, for more accurate measurement, a reference terminal temperature compensator must be used to correct the reference terminal temperature.
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