When installing and using the temperature sensor, the following matters should be paid attention to to ensure the best measurement effect:

1. Errors caused by improper installation

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 to 10 times the diameter of the protection tube; The space between the protective sleeve of the thermocouple and the wall is not filled with insulating material, which causes the heat to overflow in the furnace or the intrusion of cold air. Therefore, the gap between the protective tube of the thermocouple and the hole of the furnace wall should be blocked with insulating material such as refractory mud or asbestos rope to avoid cold and heat. Air convection affects the accuracy of temperature measurement; the cold end of the thermocouple is too close to the furnace body so that the temperature exceeds 100°C; the installation of the thermocouple should avoid strong magnetic fields and strong electric fields as much as possible, so the thermocouple and power cable should not be installed in In the same pipe to avoid introducing interference and causing errors; the thermocouple cannot be installed in the area where the measured medium rarely flows. When using the thermocouple to measure the gas temperature in the pipe, the thermocouple must be installed against the direction of the flow velocity and fully contacted with the gas. .

2. Errors caused by poor insulation

If the thermocouple is insulated, the protection tube of the temperature sensor and the wire drawing board are too dirty or too salty, resulting in poor insulation between the thermocouple and the furnace wall, which is more serious at high temperatures, which will not only cause the loss of thermoelectric potential but also Introducing interference, the resulting error can sometimes reach Baidu.