Thermocouple after aging treatment1

Thermocouple aging after what to do? Thermocouple is a common measuring instrument in the industry, has also widely used in many fields. Thermocouple in the process of use if what should I do after aging, the user to understand all this knowledge, engineering to specific introduce thermocouple for everybody below after aging treatment.

thermocouple is a direct measurement of temperature, and the temperature signals into a thermoelectric emfs, through electrical instrument ( Secondary instrument) Convert the measured medium temperature instrument. Because the instrument in the use of the characteristics of obvious, has been widely used. But any of the products in use after a period of time, it will shorten the life of a, thermocouple is not exceptional also, after aging, it is easy to affect the measurement precision of the thermocouple, so the life of the thermocouple and its degradation has a lot to do. The service life of the thermocouple is refers to the thermocouple aging to exceed the permitted error, even break time should not be used.

here thermocouple aging, namely the thermocouple after use, appear the phenomenon of aging metamorphism. Made of metal or alloy, thermocouple, its internal grain to grow at high temperature. Alloy containing a small amount of impurities at the same time, its position or shape will change, and, on the surrounding environment of the oxidation reduction or gas will react. With these changes, the thermocouple thermoelectric emf will also be extremely sensitive to change. So the thermocouple aging phenomenon is inevitable.

the ageing of the thermocouple is a quantitative change process, it is difficult for its quantitative, will vary depending on the type of thermocouple, diameter, temperature, atmosphere, the varies of time.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor