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Is it possible to use a capacitive proximity sensor to detect fluid levels (empty/not-empty) in a polyethylene bottle?

Question asked by Kim McCavit on Sep 5, 2014
Latest reply on Sep 8, 2014 by Bryce Osoinach

I'm looking for a non-contact method to detect when the fluid in a polyethylene bottle is below a predetermined level.  The fluid is dispensed from the bottle in small increments over a period of many days or even months, so the meniscus will drop very slowly.  There will be a capacitance change if the fluid is above or below the sensing plates, but it will occur at a very slow rate compared to a hand or finger in a more typical application.