Correct use of the armored thermocouple can not only accurately obtain the temperature value and ensure that the product is qualified, but also save the material consumption of the armored thermocouple, which not only saves money but also ensures product quality. Incorrect installation, errors such as thermal conductivity and time lag, they are the main errors of armored thermocouples in use. For example, the installation position and insertion depth of the armored thermocouple cannot reflect the real temperature of the furnace. In other words, the armored thermocouple should not be installed too close to the door and heating, and the insertion depth should be at least 8 of the diameter of the protection tube. ~10 times; the gap between the protective sleeve of the armored thermocouple and the wall is not filled with insulating material, resulting in heat overflow or cold air intrusion in the furnace. Therefore, the gap between the armored thermocouple protection tube and the furnace wall hole should be blocked with insulating 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 armored thermocouple is too close to the furnace body so that the temperature exceeds 100 °C; the installation of the armored thermocouple should avoid strong magnetic fields and strong electric fields as much as possible. Therefore, the armored thermocouple and the power cable should not be installed in the same conduit to avoid errors caused by the introduction of interference; the armored thermocouple cannot be installed in the area where the measured medium rarely flows. When the armored thermocouple is used to measure the gas temperature in the pipe When , the armored thermocouple must be installed against the direction of the flow velocity and fully in contact with the gas.
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