I have once used some Pt100 sensors, and I remember that they are not
perfectly linear, so we used a non-linear amplifier found on some databook.

The calibration procedure involved the extreme temperatures and also a
mid point known temperature - we had to adjust 3 trimmers and repeat
many times the procedure.

Perhaps if you create a lookup table based on the Pt100 own table and do
a segmented linearization, you may just calibrate the extremes.

Francisco


Mohit Mahajan wrote:

>Hello,
>
>I'm designing a PIC16F877 based temperature controller
>(with LCD, keypad, optocoupler etc.). I'll be using a
>Pt100 RTD as the sensor. Range is from 0C to 499.5C
>with steps of 0.5C. I'd like to give the user an
>option to calibrate the controller. How do I do this?
>(I mean, how should the calibration be done?) Or am I
>right in using a Pt100 as the sensor, which can let
>the user calibrate the controller "on the fly"?
>
>Thanks in advance,
>Mohit.
>
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