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Armored thermocouple is the most widely used temperature device in temperature measurement, its main characteristic is wide measuring range, relatively stable performance, simple structure, good dynamic response, more able to transmit 4-20mA electrical signal, easy to automatic control and centralized control.

The principle of thermocouple temperature measurement is based on the thermoelectric effect. When two different conductors or semiconductors are connected into a closed circuit, when the temperature at the two contacts is different, the circuit will produce a thermoelectric potential, this phenomenon is called the thermoelectric effect, also known as the Seebeck effect. The thermoelectric potential generated in a closed loop consists of two potentials; Thermoelectric potential and contact potential. Thermoelectric potential means the same at both ends of the conductor potential because of the different temperature, different conductors with different electron density, so they produced by electric potential is not the same, the contact potential as its name implies is refers to the two different conductor in contact, because of their different electron density so produce certain electronic diffusion, when they reach a certain potential, which is formed by the balance after The magnitude of the contact potential depends on the material properties of the two different conductors and the temperature of their contact point.

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