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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, 13:23 #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.tdi.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, 13:38

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...ablePt100.pdf
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