Thermistor thermal resistance is a temperature detecting instrument commonly used in the medium and low temperature zone. Its main features are high measurement accuracy and good stability. Among them, the measurement accuracy of platinum heat resistance is high, it is not only widely used in industrial temperature measurement, but also made into a standard reference instrument.
1. The principle of thermal resistance temperature measurement and material thermal resistance temperature measurement is based on the fact that the resistance value of the metal conductor increases with the increase of temperature to measure the temperature. Most of the thermal resistances are made of pure metal materials. Currently, the use of zui is platinum and copper. In addition, thermal resistances such as nickel, manganese and tantalum have been used.
2. Types of thermal resistance 1) Ordinary type thermal resistance From the temperature measurement principle of the thermal resistance, the change of the measured temperature is directly measured by the change of the resistance of the thermal resistance. Therefore, the lead wires of the thermal resistor body and the like are various. Changes in wire resistance can affect temperature measurements.
2) Armored thermal resistor armored thermal resistor is a solid body composed of temperature sensing element (resistor), lead wire, insulating material and stainless steel bushing. Its outer diameter is generally φ2--φ8mm. Φmm. Compared with ordinary type thermal resistance, it has the following advantages: 1 small volume, no air gap inside, thermal inertia, small measurement lag; 2 good mechanical properties, vibration resistance, impact resistance; 3 can bend, easy to install 4 long service life .
3) End face thermal resistance end face thermal resistance The temperature sensing element is wound by a specially treated resistance wire and is closely attached to the end face of the thermometer. Compared with the general axial thermal resistance, it can reflect the actual temperature of the tested end face more correctly and quickly, and is suitable for measuring the end face temperature of the bearing bush and other parts.
4) Explosion-proof type thermal resistance Explosion-proof type thermal resistance The explosion of the explosive mixture inside the casing due to the influence of spark or arc is limited to the junction box through the special structure junction box, and the production site will not lead to an explosion. Explosion-proof thermal resistors can be used for temperature measurement in explosion-proof locations in the Bla--B3c class.
1. The principle of thermal resistance temperature measurement and material thermal resistance temperature measurement is based on the fact that the resistance value of the metal conductor increases with the increase of temperature to measure the temperature. Most of the thermal resistances are made of pure metal materials. Currently, the use of zui is platinum and copper. In addition, thermal resistances such as nickel, manganese and tantalum have been used.
2. Types of thermal resistance 1) Ordinary type thermal resistance From the temperature measurement principle of the thermal resistance, the change of the measured temperature is directly measured by the change of the resistance of the thermal resistance. Therefore, the lead wires of the thermal resistor body and the like are various. Changes in wire resistance can affect temperature measurements.
2) Armored thermal resistor armored thermal resistor is a solid body composed of temperature sensing element (resistor), lead wire, insulating material and stainless steel bushing. Its outer diameter is generally φ2--φ8mm. Φmm. Compared with ordinary type thermal resistance, it has the following advantages: 1 small volume, no air gap inside, thermal inertia, small measurement lag; 2 good mechanical properties, vibration resistance, impact resistance; 3 can bend, easy to install 4 long service life .
3) End face thermal resistance end face thermal resistance The temperature sensing element is wound by a specially treated resistance wire and is closely attached to the end face of the thermometer. Compared with the general axial thermal resistance, it can reflect the actual temperature of the tested end face more correctly and quickly, and is suitable for measuring the end face temperature of the bearing bush and other parts.
4) Explosion-proof type thermal resistance Explosion-proof type thermal resistance The explosion of the explosive mixture inside the casing due to the influence of spark or arc is limited to the junction box through the special structure junction box, and the production site will not lead to an explosion. Explosion-proof thermal resistors can be used for temperature measurement in explosion-proof locations in the Bla--B3c class.
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