﻿ PT100 Calculator | Fluke Calibration

# PT100 Calculator

 Units oC oF K
 Thermometer type PT-385 PT-392
 R0 nominal value 100 Ω 500 Ω 1000 Ω Or enter R0 =
 Resistance to temperature Enter resistance (Ω) Calculated temperature =

- or -

 Temperature to resistance Enter temperature 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 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 540 °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 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.