Liquid level sensing probe and control circuit

Details Liquid level sensing probe and control circuit Liquid level sensing probe and control circuit

G - Physics

01

F

G01F 23/00 (2006.01) G01F 23/26 (2006.01) G01N 35/10 (2006.01)

Patent

CA 2126823

A method and apparatus for a liquid level sensor control circuit of a bioassay apparatus for controlling a position of a sampling probe with respect to a surface of a liquid in a container. The apparatus includes a sampling probe, an oscillator circuit coupled to the sampling probe for producing a first output signal having a constant frequency, a comparator coupled to the oscillator circuit for comparing the amplitude of the first output signal to a first reference amplitude and for producing a change signal when the amplitude of the first output signal changes with respect to the reference amplitude, and a controller responsive to the change signal for controlling the position of the sampling probe with respect to the surface of the liquid.

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