Knowledge of thermal resistance

Because the measuring accuracy of thermal resistance is high, and its performance is stable. In low temperature area, it is as a kind of common measuring apparatus. Is not only in industrial temperature measurement, the thermal resistance is widely used, at the same time it is made into standard benchmark instrument.

thermal resistance temperature measurement is mainly as metal conductor resistance value increases with the increase of the temperature of this one characteristic for temperature measurement. Thermal resistance of the materials are mainly made of pure metal material, now with more mainly copper and platinum, of course, some new materials have been added to the heat resistance of materials. Such as nickel, manganese and rhodium and so on.

in the division of thermal resistance, have normal thermal resistance, armored thermal resistance, transverse thermal power block, flame-proof, heat resistance.

normal thermal resistance is easy to understand, you can know from its principle. The temperature change is being measured through to measure the heat resistance tolerance changes, therefore, the wires of a thermal resistance and other wire resistance change will affect temperature measurement.

by thermal components ( The resistor body) , wire, insulation materials, stainless steel casing combination of armored thermal resistance. It is compared with the normal thermal resistance, its volume is small, there is no air gap, and measurement is accurate, lagging behind. The second because it has a solid body, make it good mechanical properties, resistance to vibration, shock. Third, it is very convenient in installation, because he was able to bend. Fourth, relatively speaking, it will also last longer.

take a look at transverse thermal resistance, its temperature sensing element is made of special deal with the resistance of the wire winding, close to the end of the thermometer. If it is compared with general axial thermal resistance of the teaching, it can more accurately and quickly reflect the actual temperature of end face, is used in the measurement of bearing and other parts of the end surface temperature.

there is a kind of flameproof thermal resistance, it is primarily through the special structure of the junction box, its shell internal explosive mixed gas by affected by sparks or electric arc explosion limit within the junction box, that wouldn't make production field explosion. Flameproof thermal resistance can be used in the Bla - B3c level zone with explosion danger place temperature measurement.