Fluke Calibration

PT100 Calculator

Units
Thermometer type
R0 nominal value
Resistance to temperature
Calculated temperature =

- or -

Temperature to resistance
Temperature out of bounds
Calculated resistance =
Calculated dR/dT =

Use this PT100 Calculator to calculate temperature and resistance values from the standard PT100 curves. The calculator will produce a temperature value from an entered resistance or calculate resistance and thermometer sensitivity values from an entered temperature.

Instructions

Select the required temperature units, thermometer type, and nominal resistance at 0 °C (R0) value.

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.

To calculate temperature: enter a resistance value and click calculate.

To calculate resistance: enter a temperature value and click calculate.

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
R0100.0000
A3.9827E-3
B-5.875E-7
C-4.171E-12
 0 °C to 540 °C
R0100.0000
A3.9827E-3
B-5.875E-7
C0

PT-385

 -200 °C to 0 °C
R0100.0000
A3.9083E-3
B-5.775E-7
C-4.183E-12
 0 °C to 540 °C
R0100.0000
A3.9083E-3
B-5.775E-7
C0

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 confidently and with these benefits:

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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