The Fluke PT100 Resistance Chart and Calculator make it easy to calculate temperature and resistance values from PT100 and PT1000 resistance curves. These tools are essential for accurate measurements and calibration, ensuring your RTD sensors perform reliably.The calculator will produce a temperature value from an entered resistance or calculate resistance and thermometer sensitivity values from an entered temperature.
How to Use the PT100 Calculator
The Fluke PT100 Calculator simplifies the process of calculating temperature and resistance.
Also, see our PT100 Calculator.
Use this PT100 Table Generator to generate a custom PT100, PT500, or PT1000 resistance table in Celsius, Fahrenheit, or Kelvin, by PT-385 or PT-392 thermometer type in any increment that you can download as a CSV and print.
Instructions
Select the required temperature units, thermometer type, and nominal resistance at 0 °C (R0) value.
PT-385 and PT-392 identify the class of the instrument. PT-392 has higher purity platinum wire and is specified with a higher level of accuracy.
You can enter a custom R0 value but understand that calculated values will be unique for the thermometer and will not be of standard table value.
Select the required temperature range and table increment size. Allowed table increment is 0.1 to 10 degrees.
The table is generated into a downloadable text file that lists temperature, resistance and dR/dT at each temperature over the chosen range.
Resistance results are given in ohms. Thermometer sensitivity (dR/dT) is given in ohms-per-degree (for example Ω/°C).
The calculator uses the following equation and coefficients.
RTD / PT100 Equation
R = R0 [1 + A t + B t2 + C (t – 100) t3]
PT-392
| -40 °C to 0 °C | |
| R0 | 100.0000 |
| A | 3.9827E-3 |
| B | -5.875E-7 |
| C | -4.171E-12 |
| 0 °C to 540 °C | |
| R0 | 100.0000 |
| A | 3.9827E-3 |
| B | -5.875E-7 |
| C | 0 |
PT-385
| -200 °C to 0 °C | |
| R0 | 100.0000 |
| A | 3.9083E-3 |
| B | -5.775E-7 |
| C | -4.183E-12 |
| 0 °C to 650 °C | |
| R0 | 100.0000 |
| A | 3.9083E-3 |
| B | -5.775E-7 |
| C | 0 |
R0 = Nominal thermometer resistance at 0 °C
A, B, C = equation coefficients obtained from the standards listed below.
Calculated values and the PT-100 equation are from the following standards: IEC 60751:2008, ASTM E1137-08(2020), and JIS C 1604:1997.
Learn how to calibrate PT100s in house
Let Fluke show you how to calibrate your PT100s, RTDs, thermocouples, and temperature transmitters in-house.
1. Improve quality. Know how your important instrumentation is doing and control your processes more efficiently.
2. Reduce turn times and risk of equipment damage. No more shipping probes out of house for service.
3. Save money. Save on re-calibration costs.
4. Automate calibration. Track equipment efficiently with software.
For more information, read the article, How to calibrate PT100s in-house
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Explore the PT100 Resistance Chart and Calculator
The PT100 and PT1000 resistance charts are standard tools for understanding how temperature correlates with resistance. With the Fluke PT100 Calculator, you can:
- Calculate resistance values from a given temperature.
- Determine temperature values from a measured resistance.
- Access precise data based on international standards, such as IEC 60751.
Whether you're working with PT100 or PT1000 sensors, these resources simplify complex calculations, making them accessible for professionals and beginners.
PT100 Resistance Chart Overview
A PT100 resistance chart outlines the relationship between temperature and resistance for a PT100 RTD (Resistance Temperature Detector).
- PT100 Sensors: Have a nominal resistance of 100 ohms at 0°C.
- PT1000 Sensors: Similar to PT100 but with a nominal resistance of 1,000 ohms at 0°C.
These charts use precise coefficients and formulas to map temperature to resistance. Commonly used standards include:
- IEC 60751: Defines resistance and tolerance for RTDs.
- ASTM E1137: Provides specifications for RTD applications.
A PT100 or PT1000 resistance chart ensures accurate readings and proper sensor calibration across a wide temperature range.
Why Use Fluke’s PT100 Calculator and Resistance Charts?
Fluke’s PT100 tools are built to provide accurate, reliable, and easy-to-use solutions for your temperature measurement needs. Fluke helps you achieve precision and confidence in your results, from calibrating RTDs to troubleshooting systems.