Performance of Industrial Thermistors

Thermistor is a commonly used temperature measuring element in medium and low temperature areas, and is widely used in thermal power generation units. Understanding the working principle of thermistor and applying it to practical production is of great significance for ensuring the accuracy and reliability of thermal measurement. Thermistor is based on the thermal effect of resistance for temperature measurement, that is, the characteristic of the resistance value of the resistor changing with temperature. Therefore, as long as the resistance change of the sensing thermistor is measured, and then converted into a voltage signal through the measuring bridge and sent to the display instrument for indication or recording of the measured temperature, it can be measured
The most widely used thermal resistance materials at present are platinum and copper: platinum resistance has high accuracy, is suitable for neutral and oxidizing media, has good stability, and has a certain degree of nonlinearity. The higher the temperature, the smaller the resistance change rate; Copper resistors have a linear relationship between resistance and temperature within the temperature measurement range, with a large number of temperature lines. They are suitable for non corrosive media and are prone to oxidation above 150 ℃.
Under the action of temperature, the resistance of the resistance wire of the thermistor element changes accordingly. Can be used to measure temperatures within the range of -200 ℃ to+800 ℃. Its advantage is that the deviation is extremely small. Due to its excellent electrical output performance, thermal resistors can provide accurate input values for displays, recorders, regulators, scanners, and computers.
From the perspective of the change in resistance with temperature, most metal conductors have this property, but not all can be used as thermometers. Metal materials used as thermistors generally require: a large and stable temperature coefficient as much as possible, a high resistivity (reducing the size of the sensor at the same sensitivity), stable chemical and physical properties within the temperature range of use, good material reproducibility, and a linear relationship between resistance values and temperature changes.