How to control the stability of the thermocouple?2

Thermocouple, is currently the most widely in the use of temperature measuring element of a type, it is the highest in the development of measuring sensor precision, economy the best product, so it became the direct measurement of temperature, and the temperature signals into a thermoelectric emfs, through electric instrument converts the temperature of the measured medium. So in the process of measurement, in order to reduce error and how to control the stability of the thermocouple?

thermocouple measuring the hot end and cold end temperature difference between. In order to get the feeling of hot end point of the absolute temperature, you must test the cold end temperature and adjust the thermocouple output accordingly. Now, the cold end at the input to the thermocouple signal processing unit with the temperature usually rely on materials with high heat conductivity of stay. 381 WMK thermal conductivity of copper is an ideal material, must input connection and electrical isolation, heat the road to the piece. The signal processing unit ideally should be in the same temperature environment.

the stability of the thermocouple, by using different temperature, atmosphere, for the same kind of sensors, such as K type thermocouple, the highest use temperature also changes with different diameter. Diameter of the same type K thermocouple is also due to the difference of structure, the stability of also have very big difference.

when choosing thermocouple, must consider: in view of the conditions of use common temperature and highest temperature; Using atmosphere such as REDOX; Vibration resistance. For prefabricated thermocouple, the influence of the atmosphere, first of all depends on and structure of the thermocouple protection tube material. So familiar with master various protection tube material of physical and chemical properties, it is very necessary.

thermocouple influenced by the outside world is so big, we in the use of thermocouple, the need to control the stability of the thermocouple, according to the different environment to different treatment of the installation of the thermocouple, in order to ensure that our measurement accuracy is very necessary.

more high-quality sensors at https://www. rtdcn。 Com /

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