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PT100 RTD Lead resistance compensation

Discussion in 'General Electronics Discussion' started by Mayuri, Nov 29, 2012.

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  1. Mayuri


    Nov 29, 2012

    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...

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    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.

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