The most widely used materials for thermal resistors: platinum and copper

At present, the most widely used thermal resistor materials are platinum and copper: platinum resistors have high precision, are suitable for neutral and oxidizing media, have good stability, have certain nonlinearity, and the higher the temperature, the smaller the resistance change rate; copper resistors have a linear relationship between resistance value and temperature within the temperature measurement range, have a large temperature line number, are suitable for non-corrosive media, and are easily oxidized when exceeding 150. The most commonly used in China are R0=10Ω, R0=100Ω and R0=1000Ω, and their graduation numbers are Pt10, Pt1000, respectively; copper resistors have two types, R0=50Ω and R0=100Ω, and their graduation numbers are Cu50 and Cu100. Among them, Pt100 and Cu50 are the most widely used.
Although thermal resistor temperature sensors are widely used in industry, their application is limited to a certain extent due to their temperature measurement range. The working principle of thermal resistors is based on the change of the resistance value of conductors or semiconductors with temperature.