Temperature sensors should pay attention to improper installation errors. Temperature sensors are the core part of temperature measuring instruments and come in a wide variety of varieties. When installing and using temperature sensors, attention should be paid to the errors introduced by improper installation in order to ensure optimal measurement results. If the installation position and insertion depth of the thermocouple cannot reflect the true temperature of the furnace, in other words, the thermocouple should not be installed too close to the door and heating area, and the insertion depth should be at least 8-10 times the diameter of the protective tube. The gap between the protective sleeve of the thermocouple and the wall is not filled with insulation material, which may cause hot overflow or cold air to enter the furnace. Therefore, the gap between the thermocouple protective tube and the furnace wall hole should be blocked with insulation materials such as refractory mud or asbestos rope 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, causing the temperature to exceed 100 ℃. The installation of thermocouples should avoid strong magnetic and electric fields as much as possible, so thermocouples and power cables should not be installed in the same conduit to avoid introducing interference and causing errors. Thermocouples cannot be installed in areas where the measured medium flows very little. When measuring the gas temperature inside a tube with a thermocouple, it must be installed against the flow velocity direction and fully in contact with the gas.