The thermal resistance is the most commonly used temperature measuring element in the low temperature area. Under normal circumstances, thermocouple' target='_blank'>thermocouples are used when measuring higher temperatures above 500 °C, but thermocouples have high requirements on the anti-interference measures of secondary surfaces because of their small output thermoelectric potential for low and medium temperature areas below 500 °C. , If the thermocouple is used, it is generally difficult to achieve accurate measurement. Therefore, in the lower temperature area, considering that the relative error caused by the change of the cold end temperature is also very good, it is generally suitable to use the thermal resistance temperature measurement surface. The characteristic of stability, the measurement principle of thermal resistance is based on the functional relationship between the resistance and temperature of the conductor or semiconductor material. That is, when the temperature changes, the resistance of the conductor or semiconductor also changes, and then the temperature value of the measured object is displayed on the surface. Thermal resistances are mostly made of pure metal materials, and the most widely used thermal resistance materials are platinum and copper. Platinum resistance has high accuracy, is suitable for neutral and oxidizing media, has good stability, and has a certain nonlinearity. The higher the temperature, the smaller the resistance change rate. The resistance value of copper resistance and temperature are linearly related in the temperature measurement range, which is suitable for non-corrosive medium. In addition, materials such as nickel, manganese and rhodium are also used to make thermal resistance, the composition and connection method of thermal resistance temperature measurement system: the composition of thermal resistance temperature measurement system, the thermal resistance temperature measurement system generally consists of thermal resistance, connecting wires and display surfaces, etc. composition.
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