Thermocouple (thermocouple) is a temperature measuring element commonly used in temperature measuring instruments. It directly measures the temperature, converts the temperature signal into a thermoelectromotive force signal, and converts it into the temperature of the measured medium through an electrical instrument (secondary instrument). The appearance of various thermocouples is often very different due to needs, but their basic structures are roughly the same, usually composed of main parts such as thermode, insulating sleeve protection tube and junction box, usually with display instruments, recording instruments and electronic adjustment. used in conjunction with the device.
In industrial production processes, temperature is one of the important parameters that need to be measured and controlled. In temperature measurement, thermocouples are widely used. They have many advantages, such as simple structure, convenient manufacture, wide measurement range, high precision, small inertia, and easy remote transmission of output signals. In addition, because the thermocouple is an active sensor, it does not need an external power supply during measurement, and it is very convenient to use, so it is often used to measure the temperature of gas or liquid in furnaces and pipes and the surface temperature of solids.
Thermocouple is a commonly used temperature measuring element in temperature measuring instruments. When two ends of conductors with different components are connected into a loop, when the temperature of the two junction thermocouples is different, a thermal current will be generated in the loop. If there is a temperature difference between the working end of the thermocouple and the reference end, the display instrument will indicate the temperature value corresponding to the thermoelectric potential generated by the thermocouple. The thermoelectric heat of the thermocouple will increase as the temperature of the measuring end increases, and its size is only related to the temperature of the thermocouple material and both ends, and has nothing to do with the length and diameter of the hot electrode. The shape of various thermocouples is often very different due to needs, but their basic structures are roughly the same, usually composed of main parts such as thermode, insulating sleeve protection tube and junction box, usually with display instruments, recording instruments and electronic adjustment. used in conjunction with the device.
Simply put, a thermocouple is a temperature measuring element, which directly measures the temperature, converts the temperature signal into a thermoelectromotive force signal, and converts it into the temperature of the measured medium through an electrical instrument. Today, there are three types of thermocouples commonly used in box-type electric furnaces, such as K, S, and B types. If the temperature is ℃, a B-type thermocouple is required, and its temperature measurement range is 50-1800 ℃.
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