Method of and device for fluid surface detection using an...

Details Method of and device for fluid surface detection using an... Method of and device for fluid surface detection using an...

G - Physics

01

F

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

Patent

CA 2100807

METHOD OF AND DEVICE FOR FLUID SURFACE DETECTION USING AN ULTRASONIC TRANSDUCER A B S T R A C T This invention relates to a circuit of an ultrasonic transducer in a surface detecting device, comprising first voltage generating means for generating a first voltage proportional to the resonant frequency of the ultrasonic transducer, means for generating a refe- rence voltage, and comparator means for monitoring the first and reference voltages and generating a surface detect signal when the first voltage drops below the reference voltage as the transducer contacts the fluid surface. Figure 2.

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