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PT100 RTD Lead resistance compensation

Mayuri

Nov 29, 2012
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Nov 29, 2012
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Hello

I am using PT100 RTD to monitor temperature in my product.

PT100 Sensors will have a lead resistance which will give rise to offset error..

This needs to be compensated.
Do PT100 sensor manufacturer provide this compensation in the cable or should I provide it by using a wheatstone bridge?

If bridge is to be use then how should i go about it?
pls help me...

Regards
Mayuri
 

Harald Kapp

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Nov 17, 2011
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1) No, the manufacturers do not and can not provide a compensation because they do not know the length of the cable and therefore the resistance.
2) Yes, you will have to provide the compensation.
3) No, a wheatstone bridge is not the right way for compensating the lead resistance.

There are several methods for using PT100: 2-wire, 3-wire or 4-wire.
Compensation requires 3- wire or 4-wire topologies. I recommend one of those.

Here is an application presentation.
And here is some comprehensive theory on the PT100s.


Harald
 
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