Classification Of Precious Metal Thermocouples

Commonly used thermocouples can be divided into two categories: standard thermocouples and non-standard thermocouples. The standard thermocouple referred to is a thermocouple that has a national standard that specifies the relationship between its thermoelectric potential and temperature, allowable errors, and a unified standard graduation table. It has accompanying display instruments available for selection. Non standardized thermocouples are not as good as standardized thermocouples in terms of usage range or 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 have been produced in accordance with IEC international standards in China, and seven standardized thermocouples, S, B, E, K, R, J, and T, have been designated as the unified design type thermocouples in China.