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RTD Thermistor Fine Tuning circuit

Discussion in 'General Electronics Discussion' started by Adam12, Jul 27, 2015.

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  1. Adam12

    Adam12

    1
    0
    Jul 27, 2015
    Hi,
    I'm looking for help designing a circuit that can fine tune/calibrate the output of an RTD Thermistor. Looking for an accuracy of 0.1 ohms and a linear range of 0 to 10 ohms. I thought it would be as easy as a single POT but I can't seem to find the part with those specs.
    What's it for?
    I have 3 RTD thermistor temperature probes that feed one PID(MYPIN TA4 temperature process control module). I'm using rotary knobs to switch between probes and there is a 0-2 degrees fahrenheit temperature variance between the probes that I hope to null with this circuit. I'll duplicate this circuit and apply it to two of the RTD's to match the "master" RTD.
    Thanks for any help.
    Adam12
     
  2. shrtrnd

    shrtrnd

    3,821
    519
    Jan 15, 2010
    Get on the Omega website. If you don't see what you want, contact them for one of their engineers to help you.
    You don't want to reinvent the wheel here. The engineers at Temperature device manufacturers have heard and seen it all. They can help with
    specific rcommendations.
     
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