How to install a thermocouple for testing

When using a thermocouple, please pay attention to the following points: select the thermocouple and protective cover according to the measured upper temperature limit, and select the thermocouple for testing according to the structure and installation characteristics of the object. Specification and size, correct selection of compensation line. When connecting the compensation line, be careful not to reverse it. The compensation wire is preferably placed in the iron pipe, and the iron pipe is grounded to avoid mechanical damage and electromagnetic interference. The position where the thermocouple is inserted into the furnace should be a representative position in the furnace and can represent the actual temperature in the furnace. The depth of the thermocouple inserted in the furnace should not be less than 8 to 10 times the outer diameter of the thermocouple protection tube. Make it as vertical as possible to prevent high temperature deformation. If it needs to be placed horizontally, when the protruding part is greater than 500mm, the protective part must be supported. When installing or discharging, please do not hit the thermocouple to avoid damage. The gap between the thermocouple and the furnace wall must be blocked with asbestos rope or refractory mud to prevent air convection and affect the accuracy of measurement. In use, please Be sure to pay attention to the condition of the thermocouple protection tube. If there are pitting, foaming, corrosion, thinning, cracking, etc. on the surface of the protective tube, it should be replaced immediately. There should be a proper distance between the junction box of the thermocouple and the furnace wall, usually not less than 200mm; otherwise, the temperature of the free end of the thermocouple will be too high, because the thermoelectrode will oxidize, corrode and recrystallize at high temperatures, so the thermoelectric characteristics will Changes occur, so thermocouples should be verified regularly. New thermocouples or thermocouples that have been stored for a period of time must be verified before use.

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