RTD calculator

 

 

The basic functionality of an RTD such as a Pt100, is based on the principle that the resistance of a metal will increase or decrease in relation to temperature.


It follows that a temperature can be determined based on a specific resistance and vice versa.
For a full explanation of RTD fundamentals please click here.

 

Standards exist such as IEC 60751, which determines temperature/resistance profiles. These can then be used to determine a resistance value relevant to a particular temperature for example.


The calculator below is based on IEC 60751 profiles and can be used to calculate a resistance value based on a temperature input.

 

 

Resistance calculator for platinum RTDs in conformance with IEC 60751

 

How to use the RTD resistance calculator:

 

  1. Enter the RTD resistance at 0°C. (Most RTDs have a resistance of 100 ohms at 0°C).
  2. Enter the RTD temperature in °C.
  3. Read the RTD resistance

 

Resistance calculator for platinum RTDs in conformance with IEC 60751:

 

 

Callendar-Van Dusen equations:

RTD temperature ≥ 0°C: Rt = R0(1+At+Bt2)

RTD temperature < 0°C: Rt = R0[1+At+Bt2+C(t-100)t3]

 

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