Pt100 is a platinum thermistor whose resistance is directly proportional to the change of temperature. The relationship between the resistance of PT100 and the change of temperature is as follows: When the temperature of Pt100 is 0℃, its resistance is 100Ω. When the temperature is 100℃, its resistance is about 138.5Ω. Its industrial principle is as follows: When PT100 is at 0℃, its resistance value is 100Ω. Its resistance value will grow at a constant speed with the temperature rising.
The principle of thermal resistor is to measure the temperature by using the property that the resistance of the substance changes with the change of temperature. When there is a temperature gradient in the measured medium, the measured temperature is the average temperature in the medium within the range of the temperature sensing element.
Pt100 thermal resistor is widely applied in medical, motor, industrial, temperature calculation, resistance calculation and other high-precision temperature equipments.
Pt100 A ±（0.15+0.002|t|） 0.003851±0.000006
B ±（0.30+0.005|t|） 0.003851±0.000012
For Pt100 platinum thermistor, Class A tolerance is not applicable to the temperature range of t>650℃, and Class A tolerance is not applicable to the platinum thermistor with a two-wire system.
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