The temperature measurement principle of the thermal resistance is different from that of the thermocouple. The thermal resistance is based on the thermal effect of the resistance to measure the temperature, that is, the resistance of the resistor changes with the temperature. Therefore, the temperature can be measured only by measuring the resistance change of the temperature-sensing thermistor. At present, there are mainly two types of metal thermistors and semiconductor thermistors. In comparison, the thermistor has a larger temperature coefficient and a higher resistance value at room temperature (usually more than a few thousand ohms), but has poor interchangeability and serious nonlinearity. The temperature measurement range is only -50~300℃ It is widely used in temperature detection and control for home appliances and automobiles. Metal thermal resistance is generally suitable for temperature measurement in the range of -200~500 °C. Its characteristics are accurate measurement, good stability and reliable performance, and it is extremely widely used in process control. Metal thermal resistors commonly used in industry are seen from the change of resistance with temperature. Most metal conductors have this property, but not all of them can be used as temperature measuring thermal resistors. The general requirements for metal materials as thermal resistors are as large and stable as possible. The temperature coefficient and resistivity should be large (reduce the size of the sensor with the same flexibility), stable chemical and physical properties in the temperature range of use, good data reproducibility, and the resistance value should have an intermediate value function with temperature changes. relationship (preferably linear). It is suitable for neutral and oxidizing media, with good stability and certain nonlinearity. The higher the temperature, the smaller the resistance change rate; the resistance value of copper resistors has a linear relationship with temperature in the temperature measurement range, and the number of temperature lines is large, suitable for No corrosive medium, more than 150 easy to be oxidized. The most commonly used ones in China are R0u003d10Ω, R0u003d100Ω and R0u003d1000Ω, and their graduation numbers are Pt10, Pt100, Pt1000 respectively; copper resistors have R0u003d50Ω and R0u003d100Ω, and their graduation numbers are The numbers are Cu50 and Cu100. Among them, Pt100 and Cu50 are the most common.
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