Thermal resistance temperature measurement principle is what1

Thermal resistance variety specification is complete, the product has good measuring precision, sensitivity, stable performance, easy operation, flexible use, etc. Thermal resistance temperature measurement principle is what users know? Engineering is to introduce specific today, hope you can help users better application products.

thermal resistance temperature measurement principle of

thermal resistance temperature measurement principle and the thermocouple temperature measurement principle, the heating effect of the thermal resistance is based on the resistance temperature measurement, namely the resistance characteristics of the resistance varies with temperature. Therefore, as long as the measured feeling warm resistance of the resistance change, can measure the temperature. At present there are mainly metal thermal resistance and semiconductor thermistor two categories.

metal thermal resistance of the resistance value and temperature can be expressed in the following approximate relation, namely

Rt = Rt0 [ 1 +α( t- t0) ]

type, Rt for temperature t resistance; Rt0 for temperature t0 ( Usually t0 = 0 ℃) When the corresponding resistance; Alpha for temperature coefficient.

relationship between resistance and temperature of semiconductor thermistor for

Rt = AeBt

type of Rt for temperature t resistance; A and B depends on the structure of the semiconductor material constant.

comparison, thermistor temperature coefficient is bigger, room temperature resistance higher ( Usually in the thousands of the above) But poor interchangeability, serious nonlinear and only - temperature measurement range Around 50 ℃ ~ 300 ℃, a large number of used in home appliances and automotive temperature detection and control. Metal thermal resistance is generally applicable to - Within the scope of 200 ℃ ~ 500 ℃ temperature measurement, its characteristic is measuring accuracy, good stability, reliable performance, is widely application in process control.

industry commonly used metal thermal resistance from the perspective of the change of resistance with temperature, most of the metal conductor has this property, but not all can be used for measuring temperature resistance, as the heat resistance of the metal material general requirements: as far as possible big and stable temperature coefficient, resistivity ( Reduce the size of the sensor) under the same sensitivity , using temperature range has stable chemical physics performance, good replication of material and resistance change with temperature have the function relationship between ( The best linear relationship) 。

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