The appearance of degradation will directly affect the service life of the thermocouple

Actually the deteriorating is the process of the quantitative change of the thermocouple, so carry on the effective quantitative is very difficult, mainly depending on the type of thermocouple, using the temperature and atmosphere of the time and different and change, such as diameter, and the service life of the thermocouple is mainly refers to the thermocouple degradation development is beyond the scope of allowed, such as when a short circuit can't use the length of time, etc.

but in actual use process, prefabricated basic comes with thermocouple protection tube, only in special circumstances can use screw and so on many occasions, the use of protecting tube directly decides the service life of the thermocouple, and the thermocouple in the actual use of life, but also need according to the data collection for a long time, after long-term use of accumulated data together, can make the correct decision more use result of thermocouple. And the life of the thermocouple used in fact also have a certain relationship and its degradation, and degradation, the so-called thermocouple is a thermocouple in use after a period of time, the phenomenon such as aging or metamorphism, if it is a thermocouple alloy and metal, etc, used in high temperature, its internal grain will gradually become larger, and the alloy contains less impurities, so the grain shape and position also will appear the corresponding response.