How to use the thermocouple in order to play a bigger role - Shanghai dragon instrument electric appliance co. , LTD

Insulation deterioration and introduce error such as thermocouple insulation, maintenance of pipe and anchor plate too much dirt or salt slag between the thermocouple interelectrode and wall insulation fault, at high temperatures is more serious, which not only can make up the wastage of the thermoelectric potential but also can introduce interference, thus provoking error sometimes can reach on baidu. Improper installation error introduced such as the location of the thermocouple device and insertion depth cannot reflect the reality of the furnace temperature, etc. , in other words, the thermocouple should not be in too close to the door and the central heating, the depth of the insert should be maintained at least 8 ~ 10 times the diameter of the tube. Thermocouple incompletely, the distance between the maintenance of the casing and the wall thermal insulation material cause overflow or cold air invading furnace heating, and the space between the thermocouple hole maintenance tube and furnace wall application refractory mortar or insulating material such as asbestos cord infarction. In order to avoid cold and hot air convection and affect the accuracy of temperature measurement; Thermocouple cold end is too close to the furnace temperature above 100 ℃; Thermocouple device should as far as possible to avoid strong magnetic field and electric field, so should not be thermocouple and the power cable line in the same catheter to avoid introducing interference form error; Thermocouple cannot device in few activities within the area measured medium, when the gas temperature with thermocouple measurement tube, must make the thermocouple against the flow direction of the device, and full contact with the gas. Thermal resistance error at high temperature, such as maintenance tube with a layer of ash, dust attached to the top, the thermal resistance increases, the obstacle of heat conduction, when the temperature is lower than the true value of measured temperature value. Therefore, it is necessary to adhere to the pipe external maintenance cleaning, to reduce the error. Thermal inertia is introduced into the error due to thermal inertia of thermocouple instrument behind the change of the measured temperature, indicating value especially when stop fast measurement of the impact. So should be used as thermal electrode is fine, maintenance small thermocouple tube diameter. Temperature environment promised to maintain tube can be taken.