In practice, fabricated thermocouples usually have protective tubes, and only bare wires are used in special circumstances. Therefore, in most cases, the life of the protection tube determines the life of the thermocouple. Judging the actual service life of the thermocouple, it is necessary to collect and accumulate the data under the actual use state for a long time, and then it is possible to give a more accurate result. Thermocouples are the most commonly used temperature sensors in scientific research and production. Although the structure is simple, large measurement errors will still occur if care is not taken during use. Here, we will specifically discuss the selection of temperature measurement points, the penetration depth of thermocouples, response time, thermal radiation and thermal impedance, etc. for the simple problems in use. ﹑ Insulation resistance. The so-called deterioration of the thermocouple, that is, the phenomenon of aging and deterioration after the use of the thermocouple. Thermocouples composed of metals or alloys have internal grains that gradually grow at high temperatures. At the same time, the alloy contains a few impurities, and its position or shape will also change, and it will also react to the recovery or oxidizing gas in the surrounding environment. Along with the above changes, the thermoelectromotive force of the thermocouple will also be extremely sensitive to changes. Therefore, the deterioration of the thermocouple is inevitable. The deterioration of thermocouples is a quantitative process, and it is very difficult to quantify them. It will change with the type, diameter, operating temperature, atmosphere, and time of thermocouples. The service life of the thermocouple refers to the time when the deterioration of the thermocouple exceeds the allowable error, or even the disconnection cannot be used.
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