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

1981-10-29

1985-09-10

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

73290V, 310321, 340621, G08B 2100, G01F 2300

Patent

active

045409811

ABSTRACT:
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 utilization signal when the electrical signals produced by the piezo-electric element indicate that the amplitude and duration of vibrations of the rod are below some threshold level. Such vibrations fall below the threshold level when the rod contacts liquid in the tank and so production of the utilization signal is an indication that liquid in the container has reached a certain level.

REFERENCES:
patent: 3013256 (1961-12-01), Damast
patent: 3050720 (1962-08-01), Rich
patent: 3163843 (1964-12-01), Dieckamp
patent: 3256738 (1966-06-01), Giacomo et al.
patent: 3266311 (1966-08-01), Andreasen et al.
patent: 3283181 (1966-11-01), Johanson
patent: 4008613 (1977-02-01), Myers
patent: 4107994 (1978-08-01), Sogo
patent: 4314242 (1982-02-01), Kuru et al.

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