Thermocouple what are the problems in practical application1

Thermocouple is the most commonly used in the industrial measuring instruments, but the thermocouple in the process of application is also a lot of problems. The thermocouple with a lot of problems exist in the process of practical application, for insulation problems caused by the problem was attracted the interest of the technical aspects, engineering today is to introduce what are the negative effects of thermocouple.

is affected by high temperature, because of the insulation material of thermocouple is used more metal oxide, and insulation performance of oxide by the rise of temperature. Therefore, in order to reduce the insulation due to high temperature insulation resistance to reduce the impact of the thermocouple does not produce current leakage in high temperature, or leakage current is very small, in order to guarantee the accuracy of the thermocouple temperature measurement is, according to the use of thermocouple ceiling is to select the appropriate insulation materials, make it across the insulation resistance measuring range is large enough.

is affected by moisture absorption: thermocouple insulation moisture absorption after the insulation resistance decreased, thus affecting the accuracy of the thermocouple measurements and reliability, in order to ensure accuracy of thermocouple temperature measurement, can be used to avoid pipe insulation and protection of be affected with damp be affected with damp, when using, can be dried by adopting the method of baking. If the air tightness of protecting tube material is bad, can be sintered on the surface of glass glaze, but the thermocouple temperature restricted by glass glaze temperature tolerance. The sealing glass and high temperature sealing and cement do moistureproof materials.

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