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I have a capacitance based liquid level sensor that works great when the fluid fills the clean container. The trouble is, when draining, the semi-conductive liquid being measured (milk) leaves a film on the inside of the container. This fools the capacitance sensor into thinking it is still full. The film of milk coats and connects both side of the container (inside), which acts as a capacitive low impedance for the sensing plates (outside).
Please: How do I get around this effect?
I am working on a solution to ignore the imaginary part of the as voltage by comparing the phase of the signal source against the signal measured elsewhere. Any ideas?
Please: How do I get around this effect?
I am working on a solution to ignore the imaginary part of the as voltage by comparing the phase of the signal source against the signal measured elsewhere. Any ideas?