The thermal resistance is composed of a resistor body (temperature measuring sensitive element - temperature sensing element), a lead wire, an insulating sleeve and a junction box, and the resistor body is a main component of the thermal resistor.
The most widely used thermal resistance materials are: platinum, copper, nickel, iron, and bismuth iron alloys, and platinum and copper are commonly used. Materials for making thermal resistance should have the following characteristics:
1 The temperature coefficient of resistance is large to improve the sensitivity of the thermal resistance;
2 The resistivity Ï is as large as possible to reduce the size of the resistor body with the same sensitivity;
3 The chemical and physical properties of the material remain stable within the range of use of the thermal resistance;
4 The material is purified, extendable, and self-made.
2, the structure of the thermal resistance
Metal thermal resistors are classified according to their structure types: ordinary type, armor type, and film type.
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