Funcionament principi de termoparell_Baidu sap

Thermocouple is a temperature sensing element and an instrument. It directly measures temperature and converts the temperature signal into a thermoelectric potential signal, which is 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 at both ends, a current will pass through the loop. At this time, there is an electromotive force between the two ends - thermoelectric potential, which is the so-called Seebeck effect. Two homogeneous conductors of different components are thermocouples. The end with higher temperature is the working end, and the end with lower temperature is the free end, which is usually at a constant temperature. According to the functional relationship between thermoelectric potential and temperature, a thermocouple scale is made; the scale is obtained when the free end temperature is 0 degree , and different thermocouples have different scales. The basic principle of thermocouple temperature measurement: weld two conductors or semiconductors A and B of different materials together to form a closed loop. When there is a temperature difference between the two attachment points 1 and 2 of conductors A and B, an electromotive force is generated between the two, and a current of a certain magnitude is formed in the circuit. This phenomenon is called the thermoelectric effect. Thermocouples work by utilizing this effect.