Compensation wires are a pair of insulated wires with the same nominal value as the electromotive force of the matched thermocouple. lts function is to connect the reference end of the thermocouple to a locaion far away from heat sources or with a relatively constant ambient temperature to compensate for the errors caused by temperature changes at their connection to the thermocouple.

When the distance between the instrument and the thermocouple is far, in order to ensure measurement accuracy, the most ideal solution is to extend the thermocouple according to the original metal wire and connect. This method has high accuracy, but the material cost is verv expensive. Another aloy compensation with similar electromotive force characteristics to thermocouples can be chosen, with high cost-effectiveness, easier to use.

Compensation wires can use multiple strands of smalldiameter wires to improve the flexibiity of the circuit, which is convenient for wiring and can also shield external interference.

The quality selection of compensating wires will directly affect the accuracy of temperature measurement and control.