Thermocouple is usually and display instrument, recording instrument, such as supporting the use of electronic calculator. Thermocouple 0 - in the process of direct measurement of all kinds of production 1300 degrees within the scope of liquid, steam and gas medium and solid surface temperature. Structure and definition of thermocouple compensation wire thermocouple compensation conductor should be referred to as 'compensation wire, usually by the compensating conductor wire, insulation, sheath, shielding layer. In a certain temperature range ( Including room temperature) , with the matched the thermocouple thermoelectric emfs the nominal value of the same one with the insulation wire, use them to connect the thermocouple and measuring devices, to compensate them with the error produced by the temperature change of the thermocouple junction. Between the thermocouple and measuring device using compensation conductor, its advantage is 21. To improve physical properties and mechanical properties of thermocouple temperature measurement circuit, using multi-strand wire core or small diameter flexible compensation wire line can be improved, is convenient wiring, also can adjust circuit resistance or shielding interference. 2. Measuring circuit to reduce costs, distance when the thermocouple and measuring devices, and using the compensating conductor can save a lot of thermocouple material, especially when using the precious metal thermocouple, more obvious economic benefit.