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- 16th May 2012, 12:30 #1

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## RTD PT100 Temperature from Resistance

Hello!

Can someone tell me how to calculate RTD PT100 Temperature from its Resistance. I need the equation for calculating temperature from resistance. I've coded for resistance and it is working properly. I need the equation to get the value of temperature from rtd pt100's resistance.

- 16th May 2012, 12:30

- 16th May 2012, 13:02 #2

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## Re: RTD PT100 Temperature from Resistance

- 16th May 2012, 13:02

- 16th May 2012, 13:23 #3

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## Re: RTD PT100 Temperature from Resistance

PT100 TEMPERATURE / RESISTANCE TABLE

http://www.herrera.unt.edu.ar/iidpr/..._R%20Table.pdf

http://www.intech.co.nz/products/tem...re/typert.html

http://www.t-d-i.co.uk/prtcalc.htm

- 16th May 2012, 13:23

- 16th May 2012, 13:29 #4

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## Re: RTD PT100 Temperature from Resistance

The post asks for the inverse calculation. It can be performed based on a polynominal as well. The fit should be calculated based on the intended accuray and temperature range with the necessary order.

You can use the curve fit feature of a spread sheet calculator like MS Excel to calculate the polynomial coefficients.Last edited by FvM; 16th May 2012 at 13:36.

- 16th May 2012, 13:35 #5

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## Re: RTD PT100 Temperature from Resistance

Sorry, but I've checked all those links. The quuation I have is giving the right temperature only upto 100 degree C. Any thing above 100 degree C, I'm getting wrong values.

- 16th May 2012, 13:38 #6

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## Re: RTD PT100 Temperature from Resistance

Apparently, you are doing something wrong.

- 16th May 2012, 15:35 #7

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- 16th May 2012, 16:00 #8

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## Re: RTD PT100 Temperature from Resistance

Did you read this?

http://www.pentronic.se/Portals/0/PD...able-Pt100.pdf

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