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Liquid Sensing

Robert Lass
Prodigy 20 points
Other Parts Discussed in Thread: LDC1614EVM, FDC1004

What information is there available about liquid level sensing with Inductive Sensing?

I have the LDC1614EVM and it can detect tap water reliably when no metal is in proximity of the container, but in my application, there is metal 1cm from the edge of the container. I am positioning the coil on the side of the container. The container is ~8mm thick.

Optimal coil design/frequency advice?

How do you avoid sensing metal around the fluid?

  • 0
    TI__Genius 14270 points
    In general, we recommend using the capacitive devices (such as the FDC1004) for liquid level sensing. It sounds like you are getting good results from the LDC, and so you would want to position the sensor away in the middle of the tank if possible.

    Regards,

    ChrisO
  • 0 in reply to Chris Oberhauser66
    Prodigy 20 points
    Thanks for the response. I have testing capacitive sensors, and they work great for detecting the liquid. I ran into a issues with the metal that runs throughout the container; it was overpowering the capacitive sensor. There was no longer resolution when sensing the liquid. Once the metal was added to container, the capacitive sensor measured the metal in the fluid and not the level of the fluid. So is there a resonant frequency that is least affected by metal?