An overview of the thermocouple temperature measurement and a thermocouple as the original adjusting device normally used to support and display instrumentation to directly measure the temperature of the production process gases, liquids and solid surfaces. Dichotomous classification thermocouple type thermocouple indexing number of short measurement range (℃) period of time measurement (℃) platinum and rhodium 30 - platinum and rhodium 6 WRR B 0-1600 1800 PtRh10 WRP S 0-1300 1600 platinum-nickel-chromium - Nickel Silicon WRN K 0-1100 1300 EU-2 nickel-chromium - copper silicon test copper WRK EE 0-800 800 EA-2 three types and specifications of nickel-chromium - nickel-chromium thermocouple, nickel-chromium - copper-nickel (Cu test) thermocouples in the form of structural features and specifications form the junction box in the form of fixed protection tube diameter (mm) no fixed safety device is fixed at right angles to the threaded mounting flange flanges flanges splash waterproof Φ16 Φ12 Code 123452301 protection tube material: stainless steel 20 # 1Cγ18Ni9Ti protection tube length (mm) :300-2000, such as: WRN220 (K indexing) is a nickel-chromium - nickel silicon thermocouple mounting screw, splash protection tube diameter of 16 platinum and rhodium 30 - 6 platinum and rhodium, platinum and rhodium 10 - thermocouple type specification in the form of structural features of platinum mounting junction box in the form of protective tube diameter (mm) no fixed safety device is fixed at right angles to the mounting flange threaded flanges flanges splash waterproof Φ16 Φ12 Φ25 code 1234523012 protection tube material: high aluminum alumina tube protection tube length (mm) :300-650 (platinum and rhodium 30 - platinum and rhodium 6) ,700-2000 (platinum rhodium - platinum)