Thermocouple tube and casing heat transfer problem of key points1

Thermocouple and a temperature instrument is commonly used in industrial production. In the process of application, a variety of factors will cause the measuring error of thermocouple, affect the accuracy of measurement results. The thermocouple conductor and casing heat transfer problems may cause measurement error, in order to reduce this effect, should pay attention to the following points.

1, the insert depth requirements: should have enough insert depth measurement end, should make the measurement end of the protective casing over the center line of the pipe 5 ~ 10 mm.

2, insertion direction requirement: ensure good contact with temperature measuring elements and fluid, it is best to meet to insert measured medium, orthogonal 90 ° can also, but not with the formation of measured medium downstream.

3, the choice of thermocouple requirements: if the object to be measured is small in size, heat capacity is not big, should as far as possible need not metal casing, and the fine diameter thermocouple wire.

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