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Thermocouple Sensor

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A thermocouple is a temperature sensing element and an instrument. It directly measures temperature and converts the temperature signal into a thermoelectric electromotive force signal, which is then converted into the temperature of the measured medium through an electrical instrument (secondary instrument). The basic principle of thermocouple temperature measurement is that two conductors of different materials form a closed loop. When there is a temperature gradient between the two ends, a current will flow through the loop, and an electromotive force exists between the two ends—thermoelectric electromotive

force, which is the so-called Seebeck effect. The two homogeneous conductors of different materials are the thermoelectrodes. The end with a higher temperature is the working end, and the end with a lower temperature is the free end, which is usually at a constant temperature. According to the functional relationship between thermoelectric electromotive force and temperature, a thermocouple indexing table is made; the indexing table is obtained when the free end temperature is at 0°C, and different thermocouples have different indexing tables. ^[2

When a third metal material is inserted into the thermocouple loop, as long as the temperature at the two junctions of this material is the same, the thermoelectric potential generated by the thermocouple will remain unchanged, i.e., it is not affected by the insertion of the third metal into the loop. Therefore, in the thermocouple

Thermocouple Sensor

When measuring temperature, a measuring instrument can be connected. After measuring the thermoelectric potential, the temperature of the measured medium can be known.







Note: The above information and technical parameters are compiled and published by Yangzhou Dari Electric Co., Ltd.