- 16th May 2012, 12:30 #1

- Join Date
- Apr 2012
- Posts
- 201
- Helped
- 2 / 2
- Points
- 999
- Level
- 7

## 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

- Join Date
- Feb 2008
- Location
- Romania
- Posts
- 1,875
- Helped
- 1040 / 1040
- Points
- 37,620
- Level
- 47

## Re: RTD PT100 Temperature from Resistance

- 16th May 2012, 13:23 #3

- Join Date
- Sep 2010
- Location
- Pancevo, Serbia
- Posts
- 6,468
- Helped
- 1704 / 1704
- Points
- 54,409
- Level
- 56

## 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

- Join Date
- Jan 2008
- Location
- Bochum, Germany
- Posts
- 26,643
- Helped
- 8268 / 8268
- Points
- 168,197
- Level
- 97

## 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

- Join Date
- Apr 2012
- Posts
- 201
- Helped
- 2 / 2
- Points
- 999
- Level
- 7

## 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

- Join Date
- Jan 2008
- Location
- Bochum, Germany
- Posts
- 26,643
- Helped
- 8268 / 8268
- Points
- 168,197
- Level
- 97

## Re: RTD PT100 Temperature from Resistance

Apparently, you are doing something wrong.

- 16th May 2012, 15:35 #7

- Join Date
- Apr 2012
- Posts
- 201
- Helped
- 2 / 2
- Points
- 999
- Level
- 7

- 16th May 2012, 16:00 #8

- Join Date
- Feb 2008
- Location
- Romania
- Posts
- 1,875
- Helped
- 1040 / 1040
- Points
- 37,620
- Level
- 47

## Re: RTD PT100 Temperature from Resistance

Did you read this?

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

1 members found this post helpful.