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FDC2214: Electrode thickness (not width)

andy quaas
Prodigy 40 points

Part Number: FDC2214
Other Parts Discussed in Thread: FDC1004

I have a contactless liquid level sensing (waste water) application for the FDC2214 that is out in the weather getting dirty, small rock impacts, and so on.  This is on tanks with a roughly 0.250" wall thickness and about 25" tall.  A PCB sensor is not going to survive and simple copper or aluminum foils would not last a day.  I am considering using 0.024" thick stainless or 0.125" aluminum electrodes, possibly up to 0.250" thick, both around 1" wide, to survive this environment.  What kind of effect will electrode thicknesses like that have?  Any guidance you have regarding this is much appreciated and I thank you in advance.

  • 0
    TI__Genius 17440 points
    Hi Andy,

    This sensor setup will have more fringe capacitance than one using copper tape, but that shouldn't be a problem (and could even be a benefit, depending on your sensor placement). You should be able to configure your liquid level sensing system normally.

    If you haven't seen it already, we have a TI-Design available using the FDC1004 for liquid level sensing. Although the FDC1004 uses a different sensing architecture than the FDC2214, the physical setup and sensing algorithm could be helpful for you.

    TI Design: www.ti.com/.../TIDA-00317

    Best Regards,