Thermocouple extension wire is used to extend the thermode,that is, the cold junction of the movable thermocouple connect with indicating instrument to make up temperature measurement system.

Extension wire falls into two kinds;one is extension type and the other is compensation type.The wire same with the two thermocouple wire of the Graduation Mark,is known as the extension type.The wire same with, formed by copper- cupronickel materials with different proportion, is called compensation type

The two kinds of extension wire,both have good property of resistance to acid,alkali,abrasion and fire,lts temperature range used commonly is -25~+200℃.ln addition,it can used for a ling time by immersing into the oil.The extension wire complies with GB/ T4989-94-1994 standard.