In practice, assembly thermocouples usually have protection tubes, and only naked lines are used in special cases. Therefore, in most cases, the life of the protective tube can determine the life of the thermocouple. To judge the actual life of the thermocouple, it takes a long time to collect and accumulate data in the actual application state to give more accurate results.

Thermocouple is an important commonly used temperature control sensor in scientific research and production and life. Although the structure is simple, if you don't pay attention, there will still be a large measurement error. Here, in response to the simple problems in the application, detailed analysis and discussion of the selection of temperature measurement points, the depth of penetration research of the thermocouple, the response working time, thermal radiation and thermal impedance are mainly through error data sources. Uniformity, application environment and insulation resistance.

The so -called heat -induced degradation refers to the aging and degradation of thermocouple after use. The thermocouples made of metal or alloys grow at high temperatures. The alloy material contains a small amount of impurities together, and its orientation or shape will also change. It will also cause adverse reactions with the recycling or oxidative gases in the living environment around us.

With these changes, the thermocouple of the thermocouple will become sensitive. Therefore, the deterioration of thermocouple cannot be avoided. The degradation of the thermocouple is a quantitative process that is difficult to quantify. It will affect the variety, diameter, environmental temperature, atmosphere, and time of artificial thermocouple. The service life of the thermocouple is defined as the time that the thermocouple loss exceeds the allowable error or the time that is not used.