Commonly used standard thermocouple and thermocouple can be divided into two major categories of non-standard thermocouple. The call refers to the state standard thermocouple standard specifies the relationship between the thermoelectric power and temperature, tolerance, and a unified standard thermocouple indexing table, which has its support of the display instruments are available. Non-standard thermocouple on the scope of use or magnitude and not standard thermocouple, generally there is no uniform indexing table, mainly used to measure certain special occasions. Standard thermocouple China from January 1, 1988, all thermocouple and RTD according to IEC international standards, and specify S, B, E, K, R, J, T thermocouple seven kinds of standardization for our unified design model thermocouple. (2) thermocouple thermocouple structure in order to ensure a reliable and stable work, its structure requirements are as follows: ① the composition of the two heat welding electrodes thermocouple must be strong; ② two hot electrodes should be good to each other insulated to prevent short circuit ③ compensation wire connecting the free end of the thermocouple to be convenient and reliable protection sleeve ④ should be able to ensure heat and harmful media adequately insulated electrode tip temperature line 1.0 * 100MM / 150MM (J / K type) (available build a variety of non-standard) hot tip temperature line 1.5 * 100MM / 150MM (J / K type) (can build a variety of non-standard) manifold temperature line XF-J01 (probe 4.0 * 10 / 12MM) manifold temperature line XF-J02 (ditto) fixed manifold surface temperature line (washer 3/4/5 / 6MM) manifold temperature line (YUDO style) sub