Apparatus for measurement of quantity of liquid in container

Details Apparatus for measurement of quantity of liquid in container Apparatus for measurement of quantity of liquid in container

1978-05-08

1979-11-13

Swisher, S. Clement

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

361284, G01F 2326

Patent

active

041738926

ABSTRACT:
Apparatus is provided for generating a signal proportional to the quantity of a substance in a container composed of electrically non-conducting material. The container is converted into an electrical condensor by mounting a pair of electrically isolated electrodes on the outside of the container in face-to-face relationship on opposite sections thereof, such that the substance to be measured is situated therebetween. The electrodes are connected to an electronic capacitance measuring unit, preferably including a charge pump frequency to voltage converter, which senses a capacitance of the electrodes and generates an output signal proportional to the sensed capacitance. In this manner, an instantaneous measurement of the quantity of the substance in the container can be obtained and recorded. The measuring unit can be calibrated such that its output is linearly proportional to the quantity of the substance to be measured. Through the use of this apparatus, accurate measurements can be obtained without contamination of the substance. The apparatus is particularly suited for the automatic daily measurement of the milk yield of cows on a dairy farm.

REFERENCES:
patent: Re27829 (1973-12-01), Tiffany
patent: 2936411 (1960-05-01), Doty
patent: 3939360 (1976-02-01), Jackson

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