The design principle of thermal resistance1

Design principle of PT100 thermal resistance? PT100 thermal resistance is one of the thermal resistance of many types, mainly for the temperature measurement in the industry. Pt100 platinum thermal resistance, it is directly proportional to the change of resistance with temperature. When we were in the use of PT100 thermal resistance for its design principle is to understand? Project is today to specific for everybody to introduce the design principle of the PT100 resistance.

PT100 resistance and temperature changes of the relationship as follows: its value when PT100 temperature 0 ℃ for 100 Ω, at 100 ℃ its resistance value is about 1385 Ω. Its industrial principle: when the PT100 his resistance at 0 ℃ for 100 Ω, its resistance into uniform growth as temperatures rise.

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