A thermocouple is a commonly used temperature measuring element in temperature measuring instruments. It directly measures temperature and converts the temperature signal into a thermoelectric potential signal, which is then converted into the temperature of the measured medium by an electrical instrument (secondary instrument).
The appearance of various thermocouples often varies greatly depending on the application, but their basic structure is generally the same. They usually consist of main parts such as a thermoelement, an insulating sleeve, a protective tube, and a junction box. They are typically used in conjunction with display instruments, recording instruments, and electronic regulators.
In industrial production processes, temperature is one of the important parameters that need to be measured and controlled. Thermocouples are widely used in temperature measurement due to their many advantages, including simple structure, ease of manufacture, wide measuring range, high accuracy, low inertia, and ease of signal transmission.
In addition, because thermocouples are passive sensors, they do not require an external power supply for measurement, making them very convenient to use. Therefore, they are often used to measure the temperature of gases or liquids in furnaces and pipes, as well as the surface temperature of solids.
