Errors introduced by improper installation of temperature sensor

For example, the location and insertion depth of the thermocouple installation may not reflect the true temperature of the furnace. In other words, the thermocouple should not be installed too close to the door or heating element, and the insertion depth should be at least 8 to 10 times the diameter of the protective tube. If the gap between the thermocouple's protective tube and the furnace wall is not filled with insulating material, heat may overflow or cold air may intrude. Therefore, the gap between the thermocouple's protective tube and the furnace wall hole should be sealed with refractory mud or asbestos rope to prevent the convection of hot and cold air from affecting the accuracy of temperature measurement. If the cold junction of the thermocouple is too close to the furnace body, the temperature may exceed 100°C. Thermocouple installation should avoid strong magnetic and electric fields as much as possible. Therefore, thermocouples and power cables should not be installed in the same conduit to avoid introducing interference and causing errors. Thermocouples should not be installed in areas where the measured medium has little flow. When using a thermocouple to measure the temperature of gas inside a tube, the thermocouple must be installed against the flow direction and in full contact with the gas.