The temperature range of pt100 is -200℃～+850℃.
The resistance value of pt100 will change with the change of temperature. 100 after the PT that means it is 100 ohms at 0 degrees Celsius, at 100 degrees Celsius, its resistance value is about 138.5 ohms.
It works: When PT100 in 0 degrees Celsius when his resistance value of 100 ohms, its resistance value will rise with the temperature into a nearly uniform growth. But the relationship between them should be closer to a parabola.
Platinum resistance with the change in temperature and the change in the formula:
-200<t<0 ℃ Rt=R0[1+At+Bt*t+C(t-100)t*t*t] (1)
0 ≤ t<850 ℃ Rt=R0 (1 + At + Bt2) (2)
Rt for t ℃ when the resistance value, R0 is 0 ℃ when the resistance value. A, B, coefficients in the formula are experimentally determined.
Extended information
pt100 used in medical, motor, industrial, temperature calculation, resistance calculation and other high-precision temperature equipment, the application range is very wide.
1, thin-film platinum resistance:
Thin-film platinum resistance: vacuum deposition of thin-film technology to the platinum sputtering in the ceramic substrate, the film thickness of 2 microns or less, with the glass sintering material to the Ni (or Pd) lead fixed by the laser resistance to the thin-film components.
2, temperature sensors:
Because of the PT100 RTD temperature value and resistance changes in relation to the people then use it this feature, research and development and production of PT100 RTD temperature sensors.
Baidu Encyclopedia - pt100 temperature sensor