The use of thermocouple' target='_blank'>thermocouples in production is becoming more and more extensive, and thermocouples have become one of the most commonly used temperature detection components in the industry. They have the characteristics of high measurement accuracy, wide measurement range, simple structure and convenient use. We understand and analyze products through various channels, and present various industry knowledge to the majority of netizens. Then let's learn about the judgment of thermocouples? The basic principle of thermocouple temperature measurement is that two different material conductors form a closed loop. When there is a temperature gradient at both ends, a current will flow through the loop. This is the so-called Seebeck effect. Homogeneous conductors with two different compositions are hot electrodes, the higher temperature end is the working end, the lower temperature end is the free end, and the free end is usually at a constant temperature. After a thermocouple has been used for a period of time, there will be wear and tear, and it may even be damaged. Generally, the quality of the thermocouple is related to the thermocouple wire (wire) in it, but how to judge the quality of the thermocouple wire is just that. Just discuss it. First of all, make sure that there is no problem with the appearance of the thermocouple wire, whether it is good or bad, can only be determined by testing. Put the thermocouple wire to be tested on the special ceramic sleeve for thermocouple, put it into the electric tube furnace together with the standard platinum-rhodium thermocouple, and insert the hot end into a porous metal nickel for soaking in the electric tube furnace. in the cylinder. Place the cold end of the respective compensating wire into a container maintained at zero degrees Celsius by an ice-water mixture. Keep the tube furnace at the maximum allowable temperature for the thermocouple, and maintain this range stably. At this time, use a qualified Wheatstone potentiometer to measure and record the thermoelectric potential difference between the standard thermocouple and the thermocouple to be measured. According to the recorded thermoelectric potential difference, check the graduation table to find out the corresponding temperature. If the thermocouple to be tested is out of tolerance, it can be judged as unqualified.
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