Low temperature zone in industrial heat resistance is one of the most commonly used temperature detector, mainly about the change of the temperature change into resistance to temperature measurement. The type of thermocouple used in industry, engineering today mainly introduces several kinds of industrial heat resistance type, look at the below detailed introduction.


industrial heat resistance is the main characteristic of high accuracy, stable performance. The platinum thermal resistance measurement accuracy is the highest, it is not only widely used in industrial temperature measurement, and is made into standard benchmark instrument.


1. Thermal resistance temperature measurement principle and material


thermal resistance temperature measurement is based on the metal conductor resistance value increases with the increase of the temperature of the properties for temperature measurement.


thermal resistance is mostly made of pure metal materials, the application at present most is platinum and copper, in addition, now has started using survey, nickel, manganese and rhodium materials such as thermal resistance.


2. The structure of the thermal resistor


( 1) Proficient in thermal resistance


industrial commonly used thermal resistance temperature components ( The resistor body) From the structure and characteristic of thermal resistance temperature measurement principle, the measured the change in temperature is directly measured by the change of the thermal resistance tolerance, therefore, the thermal resistance of lead wire and other wire resistance change will affect temperature measurement. As to eliminate the influence of the lead resistance with the three wire or four wire system, the specific content see this chapter 3 in the first quarter.


( 2) Armored thermal resistance


armored thermal resistance is by thermal components ( The resistor body) , wire, insulation materials, stainless steel casing combination solid body, as shown in figure 2-3 1 - 7, its diameter is generally from 2 to 8 mm, minimum of phi mm.


compared with the normal thermal resistance, it has the following advantages: (1) small volume, no internal air gap and thermal inertia, small measuring hysteresis; (2) good mechanical properties, resistance to vibration and shock. (3) can bend, easy to install (4) long service life.


( 3) Transverse thermal resistance


end heat resistance temperature sensing element resistance wire winding by special processing, close to the face in the thermometer, its structure as shown in figure 2 1 - 8. Compared with general axial thermal resistance, it can reflect more correctly and quickly end face of the actual temperature being measured, is suitable for measuring temperature bearing and other parts of the face.


( 4) Flameproof thermal resistance


flameproof thermal resistance through the special structure of the junction box, put the 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 zone with explosion danger place temperature measurement.





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