The correct use of armored thermocouples can not only accurately obtain the temperature value and ensure that the product is qualified, but also save the material consumption of armored thermocouples, which saves money and guarantees product quality. Incorrect installation, thermal conductivity and time lag errors are the main errors in the use of armored thermocouples. For example, the installation position and insertion depth of the armored thermocouple cannot reflect the true temperature of the furnace, in other words, the armored thermocouple should not be installed too close to the door and the heating place, and the insertion depth should be at least 8 of the diameter of the protective tube ～10 times; The space between the protective tube of the armored thermocouple and the wall is not filled with insulation material, which causes the heat to overflow or the intrusion of cold air in the furnace. Therefore, the space between the protective tube of the armored thermocouple and the hole in the furnace wall should be refractory mud or asbestos Insulating materials such as ropes are blocked to prevent the convection of hot and cold air from affecting the accuracy of temperature measurement. The cold end of the armored thermocouple is too close to the furnace body to cause the temperature to exceed 100℃; the installation of the armored thermocouple should avoid strong magnetic fields and strong electric fields as much as possible, so the armored thermocouple and the power cable should not be installed in the same conduit In order to avoid introducing interference and causing errors; the armored thermocouple cannot be installed in an area where the measured medium seldom flows. When the armored thermocouple is used to measure the gas temperature in the tube, the armored thermocouple must be installed against the direction of the flow rate and fully compatible with Gas contact.
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