Thermocouple type thermocouple is K type nickel chrome - Nickel silicon WRN series, N type nickel chromium silicon - Nickel silicon magnesium WRM series, E nickel chrome - Copper and nickel WRE series, iron - J type WRJ series of copper nickel, copper - model T Copper and nickel WRT series, S platinum rhodium - 10 Platinum WRD series, R type platinum rhodium - 13 Platinum WRR series, B type platinum rhodium - 30 Platinum rhodium 6 WRB series and so on. The structure of thermocouple thermocouple heat is the basic structure of electrode, insulation and protection tube; And display instrument and record instrument or computer systems. According to the environment in the field use, developed into a variety of factors such as measured medium is suitable for all kinds of thermocouple. Thermocouple is divided into simple fabricated thermocouple, thermocouple and a special form of thermocouple; Segmentation by using environment with high temperature thermocouples, wear-resistant thermocouple, thermocouple, corrosion resistance to high pressure thermocouple, thermocouple, flame-proof aluminum liquid temperature with thermocouple, circulating fluidized bed with thermocouple, cement rotary kiln with thermocouple, anode baking furnace with thermocouple, thermocouple, high temperature furnace stove with thermocouples, with thermocouple carburizing furnace, high temperature salt bath furnace with thermocouple, copper, iron and steel with thermocouple, antioxidant tungsten-rhenium thermocouples, vacuum furnace with thermocouple, platinum, rhodium thermocouple, etc.