thermocouple is the NiCr-NiSi thermocouple, it also used as a temperature transmitter, in general, K type thermocouple is connected with the display instrument, record instrument and computer by KX extension cable. It can be directly measured temperature of the gas, liquid , melting liquid and solid surface in various production process. Now the type K thermocouple have three forms: assembly thermocouple, sheathed thermocouple , assembly and sheathed combined thermocouple.