load cell temperature drift



  • Well I know that this is not directly related to the pycom device, but the code and load cell are connected to the device so i am hoping to gain from the wealth of knowledge and experience on this forum.

    Until a few weeks ago, I knew nothing at all about load cells and have never used one, now I know enough to be able to read one and understand the many factors that effect drift.

    The one I am trying to crack right now is temperature drift, and rather than re-inventing the wheel, I wondered if any one else had been through this exercise and can save me some time in understanding how to cope with it.

    Obviously, the characteristics of the cell material will change with temperature, but will this be a linear offset that can easily be fixed with a factor variable or is it as I suspect much more than that ?

    Any insight into this would be most gratefully received !



  • @pchirouze - Thanks for the help, what I think I have discovered is that rate of change has far more effect than the absolute temperature change.

    What I mean is if you change the temperature rapidly, (approx > 0.1 deg / min) then the readings spike up and down severely, but they eventually settle again and the temperature drift is less significant than I originally thought.



  • Hi,
    I don't know which load you have. But a load cell you have drift on offset and a drift on span, but span drift is lower than zero drift.
    An industrial load cell is internally compensated,but you must have high performance electronic amplification and numeric conversion for good result.
    But if your goal is to obtain a result about 1% of precision it's little easy. The stability and quality of the voltage applied to load cell is very important, because the output signal is proportional to this voltage.
    I hope this explanations help you


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