Technical Support

How a thermal resistor works

Thermal resistance is the most commonly used temperature detector in medium and low temperature region.

Its main characteristics are high measurement accuracy and stable performance. Platinum thermal resistance measurement accuracy is the highest, it is not only widely used in industrial temperature measurement, and is made into a standard reference instrument.

1, thermal resistance temperature measurement principle and material thermal resistance temperature measurement is based on the resistance value of the metal conductor with the increase of temperature and increase this characteristic to carry out temperature measurement. Most of the thermal resistors are made of pure metal materials. Platinum and copper are most commonly used at present. In addition, materials such as nickel, manganese and rhodium have been used to make thermal resistors.

2. Type of thermal resistance

1) From the temperature measurement principle of thermal resistance, it can be known that the change of the measured temperature is directly measured by the change of the resistance value of the thermal resistance, so the change of the leading line of the thermal resistance body and other wire resistance will affect the temperature measurement.

2) armored thermal resistance is a solid body composed of temperature sensing elements (resistance body), leads, insulating materials, stainless steel sleeve, and its outer diameter is generally φ 2 - & phi; 8mm, minimum up to φ Mm. Compared with the ordinary thermal resistance, it has the following advantages: ① small volume, no air gap, thermal inertia, small measurement lag; (2) good mechanical properties, vibration resistance, impact resistance; ③ Can bend, easy to install ④ long service life.

3) The end thermal resistance temperature sensing element is wound by special resistance wire and is close to the end face of the thermometer. Compared with the general axial thermal resistance, it can reflect the actual temperature of the measured end face more correctly and quickly, and is suitable for measuring the end face temperature of bearing bush and other parts.

4) Flameproof thermal resistance through the special structure of the junction box, the shell of the explosive mixed gas due to spark or arc and other effects of the explosion is confined to the junction box, production site will not lead to explosion. Flameproof thermal resistance can be used for temperature measurement in Bla- B3c class area with explosion hazard.

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