When using a thermocouple, please pay attention to the following points: select the thermocouple's hot electrode and protective sleeve according to the upper limit of the measured temperature, and select the thermocouple for testing according to the structure and installation characteristics of the object. Specifications and dimensions, correct selection of compensation lines. When connecting the compensation wire, be careful not to reverse it. The compensation wire is preferably placed in an 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 into 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, the protective part must be supported when the protruding part is larger than 500mm. When installing or discharging, 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 Always pay attention to the condition of the thermocouple protection tube. If the surface of the protective tube is found to be pitted, foamed, corroded, thinned, cracked, etc., it should be replaced immediately. There should be an appropriate 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, and the thermoelectric characteristics will be oxidative, corroded and recrystallized at high temperatures. changes, so the thermocouple should be verified regularly. New thermocouples or thermocouples that have been in storage for a period of time must be verified before use.
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