The relationship between the service life and deterioration of thermocouples

Let me introduce the relationship between the service life of the thermocouple and its deterioration. The Chinese standard only requires the stability of the thermocouple. That is, after 200h at a certain temperature, the change of thermal electromotive force before and after application. However, no rule for the service life was found. Japan's requirements for the service life of thermocouples are based on the continuous use time of thermocouples specified in the Japanese JIS (C-1602-1995) specification. For B, R, S thermocouples, it is 2000h, and for K, E, J, and T thermocouples, it is 10000h. 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 thermocouples, it is necessary to collect and accumulate data under the actual use state for a long time before it is possible to give more accurate results. 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, K-type thermocouple selective oxidation, K state and armored thermocouple shunt errors and other precautions in the application. Deterioration and service life of thermocouples The so-called deterioration of thermocouples refers to the phenomenon of aging and deterioration of thermocouples after use. Thermocouples composed of metals or alloys gradually grow their internal grains 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 a thermocouple is a quantitative process, and it is very difficult to quantify it. It will change with the type, diameter, operating temperature, atmosphere, and time of the thermocouple. 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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