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Load cell - summing

Discussion in 'General Electronics Chat' started by flatfootskier, Aug 10, 2017.

  1. flatfootskier

    flatfootskier Member

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    I want to measure the weight of a container of fluid. I want to just use 2 load cells on the front 2 LEGS (of 4).
    Can I just parallel up the 4 wires to sum the weight on the 2 legs and treat as a single load cell? What are the disadvantages of doing that vs taking 2 independent channels & adding them mathematically in the microprocessor?

    Being liquid, the load will always be UDL. I'm not worried about inaccuracies due to tilting as the load cells compress; I believe it to be negligible.

    Thank you.
     
  2. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

    Joined:
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    Ex Yorks' Hants UK
    hi ff,
    It is common practice to wire load cells of the same type in parallel.
    Some users add a 'summing circuit' PCB, this is to balance the two load cells on zero/span.

    You may find this PDF useful. [Ref Page #45]
    E
     

    Attached Files:

    Last edited: Aug 11, 2017
    • Informative Informative x 1
  3. flatfootskier

    flatfootskier Member

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    Great doc, many thanks.
    I have no idea what sort of accuracy I'll get when I parallel up 2 x cheap chinese load cells from ebay. I should be finding out soon
     

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