Correctly selecting armored thermocouples can accurately obtain temperature values

Proper use of armored thermocouples can not only accurately obtain temperature values and ensure product quality, but also save material consumption of armored thermocouples, which not only saves money but also ensures product quality. Incorrect installation, thermal conductivity, and time lag are the main errors in the use of armored thermocouples.

If 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 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 armored 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 protective sleeve of the armored thermocouple and the furnace wall hole should be blocked with insulation material 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, causing the temperature to exceed 100 ℃; The installation of armored thermocouples should avoid strong magnetic and electric fields as much as possible, so armored thermocouples and power cables should not be installed in the same conduit to avoid introducing interference and causing errors; Armored thermocouples cannot be installed in areas where the measured medium flows very little. When using armored thermocouples to measure gas temperature inside pipes, the armored thermocouples must be installed against the flow velocity direction and fully in contact with the gas.