Is there a link between the life of the thermocouple and degradation

Thermocouple in inferior is need a process of quantitative change, so it is difficult to for its quantitative, mainly with the diameter of the thermocouple, the temperature of the atmosphere, kinds and use different and change. And the service life of the thermocouple is mainly refers to, when the thermocouple in inferior than the allowed range, a more serious condition is short term cannot be used.

in our country for the main standard thermocouple just see its stable performance. For example in setting temperature after 200 h, have appeared before and after the use of the change of the thermoelectric emfs. But in terms of the service life of the thermocouple, not a rule. We will find that in the process of the actual use of prefabricated basic with thermocouple protection tube, so it not special case is not used to screw, it also suggests that in many cases, the thermocouple protection tube is directly determine its use life. Actually criteria to judge for the thermocouple, mainly combined with long-term use, coupled with our data in the actual use process, is likely to get a relatively standard answers. In fact, the life of the thermocouple may occur and degradation is directly related to, thermocouple degradation is life? Is mainly refers to the use of the thermocouple for long, and the thermocouple in the aging and deterioration. Thermocouple alloy and metal structure, under high temperature using its internal grain will appear slowly grow up. Because of the alloy with some impurities, so the thermocouple alloy structure changes on the shape and position of it, so the thermocouple after long time use, degradation phenomenon is inevitable.