Thermal resistors are the most commonly used temperature detectors in the low and medium temperature regions. Thermistor temperature measurement is based on the fact that the resistance value of a metal conductor increases as the temperature increases. Its main features are high measurement accuracy and stable performance. Among them, platinum thermal resistance has the highest measurement accuracy, and it is not only widely used in industrial temperature measurement, but also made into a standard reference instrument. Most of the thermal resistances are made of pure metal materials. Currently, platinum and copper are the most widely used. In addition, thermal resistances such as nickel, manganese and tantalum have been used. Metal thermal resistors commonly use a variety of temperature sensing materials, the most commonly used is platinum wire. In addition to platinum wire, metal thermal resistance materials for industrial measurement include copper, nickel, iron, iron-nickel, and the like.

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