Characteristics of Thermocouple Plug

Since the material of thermocouples is generally expensive (especially when precious metals are used), and the distance between the temperature measurement point and the instrument is very far, in order to save thermocouple materials and reduce costs, compensation wires are usually used to extend the cold end (free end) of the thermocouple to the control room where the Celsius degree is relatively stable and connect it to the instrument terminal. It must be pointed out that the role of the thermocouple compensation wire is only to extend the hot electrode and move the cold end of the thermocouple to the instrument terminal in the control room. It itself does not allow the influence of the change of the cold end Celsius degree on the temperature measurement to be eliminated, and it does not play a compensation role. Therefore, other correction methods are required to compensate for the influence of the cold end Celsius degree on the temperature measurement when t0≠0℃. When using thermocouple compensation wires, it is necessary to pay attention to the matching of models, the polarity is not allowed to be connected incorrectly, and the Celsius degree of the compensation wire and the thermocouple connection end is not allowed to exceed 100℃.