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Reading: RTD Calculator : Calculate Temperature from Resistance
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Inst Tools > Blog > Instrumentation Tools > RTD Calculator : Calculate Temperature from Resistance

RTD Calculator : Calculate Temperature from Resistance

Last updated: November 12, 2019 4:56 pm
Editorial Staff
Instrumentation Tools Temperature Measurement
9 Comments
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RTD Conversion tool: R to T

This is used to calculate temperature value of RTD sensor from known resistance.

This calculation tool used to find out the temperature value of a RTD sensor with known resistance.

Calculate Temperature from Resistance

Formula:

Resistive Temperature Detectors (RTDs) relate resistance to temperature by the following formula:

   RT = Rref[1 + α(T − Tref)]

Where,

RT = Resistance of RTD at given temperature T (ohms)
Rref = Resistance of RTD at the reference temperature Tref (ohms)
α = Temperature coefficient of resistance (ohms per ohm/degree)

Example:

The following example shows how to use this formula to calculate the resistance of a PT100 RTD with a temperature coefficient value of 0.00392 at a temperature of 35 degrees Celsius:

Assuming Temperature Reference = 0 Degrees

For PT100 RTD the Rref = 100

RT = 100 Ω[1 + (0.00392)(35 − 0)]

RT = 100 Ω[1 + 0.1372]

RT = 100 Ω[1.1372]

RT = 113.72 Ω

For Temperature to Resistance conversion also the same above formula applies.

The above given is a basic equation only for RTD calculation.

Note:

1.The above RTD calculation tool designed for a standard PT100 sensor.

2.If you are interested to calculate for a different RTD then change the fixed constant values as per the sensor type.

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9 Comments
  • Anonymous says:
    April 13, 2015 at 6:34 pm

    Excellent Work Dude…. Thanks for sharing

    Reply
  • C RamMohan says:
    April 20, 2015 at 4:54 am

    Its a great instrumentation tool.

    Reply
  • Dayanand says:
    November 12, 2015 at 4:46 pm

    its great bt plz send mi various formula sits in excel type file on my mail id

    Reply
  • dheeraj dhawas says:
    February 27, 2016 at 3:35 am

    Dear sir,
    tell me how u have calculate temperature coeff. Value of resistance.

    Reply
    • S Bharadwaj Reddy says:
      February 27, 2016 at 5:22 am

      Hello Dheeraj, For Temperature Coefficient Value – Pl Click here to Read

      Reply
  • Isreal Casteel says:
    September 16, 2020 at 9:42 am

    Pharm line is going down

    Reply
  • andrew says:
    August 14, 2021 at 8:30 am

    145 degrees convert to resistance

    Reply
  • Mansingh Rathore says:
    September 23, 2021 at 10:51 pm

    great explain the RTD but send me PDF all formula

    Reply
  • Amin Hassan says:
    October 30, 2021 at 11:15 am

    Measurement of temperature changes using electric resistance measurement,
    I will use to apply to Motor winding temperature monitoring

    Reply

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