Simple Construction and Purpose Needed to Know Before Buying a Thermocouple

As a sensor for measuring temperature, industrial thermocouple is generally used in conjunction with display surface, recording surface and electronic regulator. It can directly measure the temperature of liquid, steam and gas medium and solid surface in the range of 0~1600℃ in various production processes. If it is matched with a temperature transmitter that outputs 4~20mA, 0~10V and other standard current and voltage signals, it is more convenient and reliable to use. ● Structure and principle The fabricated thermocouple is composed of temperature sensing element (thermocouple core), stainless steel maintenance tube, junction box and various fixing devices. Compared with the assembled thermocouple, the armored thermocouple has the characteristics of smaller outer diameter, arbitrary bending, and strong shock resistance. Suitable installation In the case where the assembled thermocouple cannot be installed, its outer maintenance tube adopts stainless steel tube with different materials (suitable for different operating temperatures), and it is filled with high-density oxide insulator, which is very suitable for installation in harsh environments. . Explosion-proof thermocouples are generally used in production sites accompanied by various flammable, explosive and other chemical gases. If the general thermocouple is used, it is easy to cause the explosion of the ambient gas, so it is necessary to use the explosion-proof thermocouple in this occasion. gas hazardous areas. The working principle of a thermocouple is: two conductors with different components are welded at both ends to form a loop, and the direct measurement end is called the working end (hot end). The terminal end is called the cold end. When there is a temperature difference between the hot end and the cold end, the A thermal current will be generated in the loop, and when connected to the surface, the surface will indicate the corresponding temperature value of the generated thermal electromotive force, and the electromotive force will increase with the increase of temperature. The size of the thermoelectromotive force is only related to the raw material of the thermocouple and the temperature of both ends, and has nothing to do with the length and thickness of the thermocouple. ● Varieties of thermocouples The main varieties of thermocouples are different in the raw materials of the thermocouple core (two even wires), and the output electromotive force is also different. There are some differences in function.

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