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What is the reason for the error of the thermocouple of the experimental electric furnace

What is the reason for the error of the thermocouple of the experimentell elektrisk ugn

(1) Termoelementets instabilitet avser termoelementets delningsvärde, som kommer att ändras med tiden för användning och de olika användningsförhållandena. I de flesta fall kan det vara den främsta orsaken till inexakthet, och de faktorer som orsakar instabilitet är: termoelementets förångning, oxidation, reduktion, sprödhet, kristallisering, kontaminering etc. vid hög temperatur.

(2) If the thermocouple is made of a homogeneous conductor, its thermoelectric potential is only related to the temperature at both ends. If the thermocouple material is not uniform and the thermocouple is in a temperature gradient field, the thermocouple will produce an additional The thermoelectric potential depends on the temperature gradient distribution along the length of the thermoelectrode, the uneven form and degree of the material, and the position of the thermoelectrode in the temperature field.