Engineering Reference
RTD PT100 and PT1000 Resistance Reference
Derived PT100 and PT1000 resistance lookup values, Callendar-Van Dusen coefficients, sensitivity, lead-wire, self-heating, tolerance, and measurement boundaries.
- Model Range
- −200°C to 850°C
- Reference
- IEC 60751:2022 scope
- Updated
- September 27, 2026
Derived Resistance Lookup
Values are calculated at build time with the same full-precision canonical functions as the RTD calculator. They are not copied from a standards table.
| Temperature °C | PT100 Ω | PT1000 Ω | PT100 dR/dT Ω/°C |
|---|---|---|---|
| -200 | 18.52008 | 185.2008 | 0.432335 |
| -150 | 39.72318 | 397.2318 | 0.416626 |
| -100 | 60.25584 | 602.5584 | 0.405308 |
| -50 | 80.30628 | 803.0628 | 0.397128 |
| 0 | 100.00000 | 1000.0000 | 0.390830 |
| 50 | 119.39713 | 1193.9713 | 0.385055 |
| 100 | 138.50550 | 1385.0550 | 0.379280 |
| 150 | 157.32512 | 1573.2513 | 0.373505 |
| 200 | 175.85600 | 1758.5600 | 0.367730 |
| 300 | 212.05150 | 2120.5150 | 0.356180 |
| 400 | 247.09200 | 2470.9200 | 0.344630 |
| 500 | 280.97750 | 2809.7750 | 0.333080 |
| 600 | 313.70800 | 3137.0800 | 0.321530 |
| 700 | 345.28350 | 3452.8350 | 0.309980 |
| 800 | 375.70400 | 3757.0400 | 0.298430 |
| 850 | 390.48112 | 3904.8112 | 0.292655 |
Adopted Coefficients and Equations
| Term | Value | Use |
|---|---|---|
| R0 PT100 | 100 Ω | Nominal at 0°C |
| R0 PT1000 | 1000 Ω | Nominal at 0°C |
| A | 0.0039083 | Linear coefficient |
| B | -5.775e-7 | Quadratic coefficient |
| C | -4.183e-12 | Negative-temperature branch coefficient |
| T ≥ 0°C | R = R0(1 + AT + BT²) | C term omitted |
| T < 0°C | R = R0[1 + AT + BT² + C(T−100)T³] | Negative branch |
Measurement Configuration
| Configuration | Lead effect | Boundary |
|---|---|---|
| 2-wire | Both lead resistances add | Suitable only when lead error is acceptable or separately characterized |
| 3-wire | Matched leads can be compensated by the instrument | Mismatch and topology assumptions leave residual error |
| 4-wire | Separate force and sense paths largely remove lead drop | Instrument input current and connection integrity still matter |
| Measurement current | Creates I²R heating | Use datasheet dissipation information in the actual medium |
| Ratiometric ADC | Can cancel excitation/reference variation | Reference routing, settling, and resistor accuracy still matter |
Common RTD Reference Mistakes
- Assuming PT100 is 100 Ω at 25°C instead of 0°C.
- Substituting kelvin into the Celsius coefficient equation.
- Omitting the C term below 0°C.
- Treating nominal curve values as tolerance limits.
- Ignoring two-wire lead resistance.
- Assuming all three-wire leads are perfectly matched.
- Using excessive measurement current and ignoring self-heating.
- Treating dissipation constant as independent of installation medium.
- Applying the nominal inverse curve outside its stated range.
- Rounding resistance before inverse conversion.
- Confusing RTD resistance with thermistor beta behavior.
- Using this derived table as a substitute for the applicable standard or sensor datasheet.
Support reference
FAQ
What is a PT100?
A PT100 is a platinum resistance temperature sensor with nominal resistance 100 Ω at 0°C under its specified standard curve.
What is a PT1000?
A PT1000 uses the same normalized platinum curve with nominal resistance 1000 Ω at 0°C.
What standard covers industrial platinum RTDs?
IEC 60751:2022 specifies requirements and resistance-versus-temperature relationships for industrial platinum resistance thermometers and sensors.
What is the Callendar-Van Dusen equation?
It is the piecewise polynomial used here to derive resistance from Celsius temperature, including an additional C term below 0°C.
Why is the PT1000 resistance ten times PT100?
With the same normalized coefficients, changing R0 from 100 Ω to 1000 Ω scales the ideal curve and sensitivity by ten.
What resistance is a PT100 at 100°C?
Using the adopted coefficients, the derived nominal value is 138.5055 Ω.
How does lead resistance affect an RTD?
Two-wire lead resistance adds directly to the measured sensor resistance. Three- and four-wire methods can reduce or compensate that error under stated assumptions.
What is RTD self-heating?
Measurement current dissipates I²R in the element. Temperature rise depends on the installed dissipation constant and environment.
Does this table include tolerance class limits?
No proprietary or copied standard tables are reproduced. Verify class tolerances and valid temperature ranges in the applicable standard and sensor datasheet.
Can Kelvin be used directly in the equation?
No. The adopted coefficient convention uses temperature in degrees Celsius.
Can resistance be converted to temperature exactly?
The nominal curve can be inverted numerically, but measurement uncertainty, tolerance, leads, self-heating, drift, and installation remain.
Are these values a replacement for IEC 60751?
No. They are independently derived engineering lookup values from the stated model, not a reproduction or substitute for the standard.
Connected Engineering Content