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Method of distinguishing thermocouple from thermal resistance

2022-02-15 16:55:55
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Thermocouple and thermal resistance are attributed to the contact temperature measurement in temperature measurement, although the same effect is to measure the temperature of the object, but their principle and characteristics are not the same. Here is how to tell the difference between thermal resistance and thermocouple.


Hot resistance:


Although thermal resistance is widely used in industry, but because of its temperature range, its use has been restricted to a certain extent. The temperature measurement principle of thermal resistance is based on the characteristics of conductor or semiconductor resistance with temperature change. Its advantages are many, but also can be far electrical signals, high sensitivity, strong stability, interchangeability and accuracy are better, but the demand for power supply to encourage, can not be instantaneous measurement of temperature change.

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Thermocouple:


Thermocouple temperature measurement is widely used in the temperature device, is characterized by a wide range of temperature measurement, relatively stable function, simple structure, good dynamic response, coupled with the transformation of the transmitter is more able to transmit 4~20mA current signal, easy to automatic control and centralized control. Thermocouple temperature measurement principle is based on the thermoelectric effect. When two different conductors or semiconductors are connected in a closed circuit, when the temperatures at the two junctions are not together, a thermoelectric potential will occur in the circuit. This phenomenon is called thermoelectric effect. The thermoelectric potential occurring in the closed loop consists of two kinds of potentials; Thermoelectric potential and contact potential.


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