Explain some problems of measuring thermocouples

We all know that when a third metal material is connected in a thermocouple circuit, as long as the temperature of the two contacts of this material is the same, the thermoelectric potential generated by the thermocouple will remain the same, i.e. not affected by the third metal connection circuit effects. Influence. Therefore, when measuring the temperature of the thermocouple, it can be connected to the measuring instrument, and after measuring the thermoelectromotive force, the temperature of the measured medium can be known. When measuring the temperature of a thermocouple, the temperature of its cold end (the measuring end is the hot end, and the end connected to the measuring circuit through a wire is called the cold end) remains constant, and its thermoelectric potential is proportional to the measured temperature. If the (ambient) temperature of the cold junction changes during the measurement, the accuracy of the measurement can be severely affected. It is normal to take certain measures at the cold junction to compensate for the effects caused by changes in the temperature of the cold junction known as cold junction compensation of a thermocouple. It is a special compensation line used to connect measuring instruments. Type K thermocouple is a metal thermocouple in the temperature measurement area above 500℃, and its quantity is the sum of other metal thermocouples. Today, we start to understand how it divides positives and negatives. First let us understand what is accumulation and elimination. The nominal chemical composition of positive (KP) is: Ni:Cr≈90:10, and the chemical composition of negative (KN) is: Ni:Si≈97. K-type thermocouple has good linearity and large thermoelectromotive force, It can therefore be used in oxidizing and inert atmospheres.

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