# RTD PT100 Temperature from Resistance

1. ## 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.

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4. ## 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.

5. ## 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.

6. ## Re: RTD PT100 Temperature from Resistance

Apparently, you are doing something wrong.

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7. ## Re: RTD PT100 Temperature from Resistance

Originally Posted by FvM
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.
Can you give me the equation?

---------- Post added at 20:05 ---------- Previous post was at 20:04 ----------

Originally Posted by FvM
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.
Can you give me the equation with polynomial coefficients?

8. ## Re: RTD PT100 Temperature from Resistance

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