Analog Digit / Signal tools
Pt100 / Pt1000 RTD calculator
Convert between temperature and RTD resistance using the standard IEC 60751 curve, for checking a sensor with a multimeter or validating a transmitter.
Resistance
- Sensitivity at this point
- R0 (at 0 °C)
| Temperature | Pt100 | Pt1000 |
|---|
How it works
Platinum RTDs follow the Callendar–Van Dusen equation defined in IEC 60751, with R0 the resistance at 0 °C (100 Ω for a Pt100, 1000 Ω for a Pt1000).
R(T) = R0 [1 + A·T + B·T² + C·(T − 100)·T³]
A = 3.9083×10⁻³, B = −5.775×10⁻⁷, and C = −4.183×10⁻¹² below 0 °C (C = 0 at or above 0 °C). The equation is valid from −200 to 850 °C. Remember that 2-wire connections add lead resistance to every reading; 3- and 4-wire connections compensate for it.