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technical article
Cold junction temperature compensation for thermocouples
2011-7-6 16:54:27

Because the materials of thermocouples are generally relatively expensive (especially when noble metals are used), and the distance from the temperature measurement point to the instrument is very long, in order to save the thermocouple materials and reduce costs, compensation wires are usually used to connect the cold end of the thermocouple (free End) extends into the control room where the temperature is relatively stable, and is connected to the instrument terminals. It must be pointed out that the function of the thermocouple compensation wire only extends the hot electrode, so that the cold end of the thermocouple is moved to the instrument terminal in the control room. It cannot eliminate the influence of the cold junction temperature change on the temperature measurement, and it does not compensate. Therefore, other correction methods are needed to compensate for the effect on the temperature measurement when the cold junction temperature t0 ≠ 0 ° C. When using the thermocouple compensation wire, you must pay attention to the matching of the model, the polarity must not be wrong, and the temperature of the connection end of the compensation wire and the thermocouple cannot exceed 100 ° C.