Thermocouple is a temperature measuring element made using the phenomenon of thermoelectric, also known as a "thermoelectric couple".
Thermocouples are used to measure the temperature of liquids, gases, and solid surfaces , and convert the temperature signal into a thermoelectric electromotive force signal, which is then converted into the temperature of the measured medium through electrical instruments (secondary instruments). It is usually composed of main components such as thermal electrodes, insulated protective tubes, and junction boxes, and is usually used in conjunction with display instruments, recording instruments, and electronic regulators. Thermocouple is an important temperature measuring element with a wide measurement range, and its application principle is relatively simple, easy to install. It has achieved large-scale application in the power production industry and various other industrial fields.
In industrial production processes, temperature is one of the important parameters that needs to be measured and controlled. In temperature measurement, thermocouples are widely used, with many advantages such as simple structure, convenient manufacturing, wide measurement range, high accuracy, small inertia, and easy remote transmission of output signals. In addition, due to the fact that thermocouples are active sensors that do not require an external power source for measurement and are very convenient to use, they are often used to measure the temperature of gases or liquids in furnaces and pipelines, as well as the surface temperature of solids.
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Easy assembly and easy replacement
Spring loaded temperature sensing element with good seismic performance
High measurement accuracy
Large measurement range (-200 ℃~1300 ℃, in special cases -270 ℃~2800 ℃)
Fast thermal response time
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Introduction
Commonly used thermocouples can be divided into two categories: standard thermocouples and non-standard thermocouples. The so-called standard thermocouple refers to a thermocouple that has a national standard that specifies the relationship between its thermal potential and temperature, allowable errors, and a unified standard graduation table. It has accompanying display instruments for selection. Non standardized thermocouples are not as good as standardized thermocouples in terms of usage range or order of magnitude, and generally do not have a unified graduation table. They are mainly used for measurement in certain special occasions. Since January 1, 1988, standardized thermocouples and thermal resistors in China have been produced in accordance with IEC international standards, and seven standardized thermocouples, S, B, E, K, R, J, and T, have been designated