Method and apparatus for detecting the presence of liquid

Details Method and apparatus for detecting the presence of liquid Method and apparatus for detecting the presence of liquid

G - Physics

01

F

340/146, 349/38

G01F 23/00 (2006.01) G01F 23/28 (2006.01) G01F 23/296 (2006.01)

Patent

CA 1204850

ABSTRACT OF THE DISCLOSURE Method and apparatus for detecting the presence of liquid in a container includes an elongate rod (or other vibratory element) which extends into the container to contact liquid when a certain amount of liquid is present, a piezo- electric element coupled to the rod on the exterior of the container to cause the rod to vibrate in response to electrical signals and to produce electrical signals indicative of the amplitude of vibration of the rod, and circuitry for producing a utlization signal when the electrical signals produced by the piezoelectric element indicate that the amplitude and duration of vibrations fall below the threshold level when the rod contacts liquid in the tank and so production of the utilization signal is an indica- tion that liquid in the container has reached a certain level.

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