Explore the main sources of thermocouple instability

The stability test of the thermocouple is: put the thermocouple into the annealing furnace, stop annealing twice at the regular temperature, take it out after the first annealing, measure its thermoelectric potential at the regular temperature and start at E, and then put it again. Put it into the annealing furnace, and anneal it for the second time according to the above method. After taking it out, measure its thermoelectric potential at the same regular temperature point as E. The difference in thermoelectric potential (E start-E end) measured after two annealings is the stability of the thermocouple, which should meet the requirements of the Standardized Thermocouple Wire Stability Tolerance Table. Stability is an important indicator to weigh the performance of thermocouples. This article introduces the concept of thermocouple stability, analyzes the main causes affecting thermocouple stability, and shares methods and detailed requirements for detecting thermocouple stability. Thermocouple stability refers to the level at which the thermoelectric characteristics of a thermocouple change with time and conditions of use at a certain temperature. Under regular conditions, a large change in thermoelectric characteristics indicates poor stability, and a small change indicates good stability. The stability of the thermocouple will directly affect the accuracy of the thermocouple measurement. Therefore, the stability is an important indicator to weigh the performance of the thermocouple. The main factor affecting the stability of the thermocouple is the contamination and corrosion of various harmful media on the thermode in a high temperature environment; oxidation and volatilization of the thermode will occur when the thermode is used under high temperature conditions. Under the condition of long-term high temperature, the hot electrode may recrystallize, which will lead to embrittlement of the hot electrode; under the condition of neutron radiation, the local hot electrode will cause changes in composition; the deformation of the thermocouple under the action of external force will generate stress and cause stress. Change the thermoelectric properties. Standard thermocouples that are regularly reproduced in the verification procedures should undergo stability testing.

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