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For example, the installation position and insertion depth of the thermocouple cannot reflect the real temperature of the furnace. In other words, the thermocouple should not be installed too close to the door and heating, and the insertion depth should be at least 8 ~ 10 times the diameter of the protective tube; The space between the protective sleeve and the wall of the thermocouple is not filled with insulating materials, resulting in heat overflow or cold air intrusion in the furnace. Therefore, the gap between the protective sleeve of the thermocouple and the hole of the furnace wall shall be blocked with insulating materials such as refractory mud or asbestos rope, so as to prevent the convection of cold and hot air from affecting the accuracy of temperature measurement; The cold end of the thermocouple is too close to the furnace body to make the temperature exceed 100 ℃; The installation of thermocouples should avoid strong magnetic field and strong electric field as far as possible, so thermocouples and power cables should not be installed in the same conduit to avoid introducing interference and causing errors; The thermocouple cannot be installed in the area where the measured medium rarely flows. When the thermocouple is used to measure the gas temperature in the pipe, the thermocouple must be installed against the flow direction and fully in contact with the gas.