Liquid level detector

Details Liquid level detector Liquid level detector

1992-04-16

1993-11-16

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

7386424, 340620, G01N 2722

Patent

active

052627314

ABSTRACT:
A test tube holding a liquid specimen therein is arranged between a pair of electrodes arranged in an opposed relation. A conductive nozzle is inserted into a test tube. An oscillator is connected to one of these electrodes and a receiver is connected to the other electrode. A nozzle is connected to a zero potential level common to the oscillator and receiver. When the tip end of the nozzle is brought down into the level of the liquid specimen, there occurs a change in electrostatic capacity between the electrodes and hence a change in the level of a signal transmitted from the oscillator to the receiver. A determining device determines, based on the change in the level of the signal, whether or not the tip end of the nozzle is in contact with the liquid level.

REFERENCES:
patent: 3635094 (1972-01-01), Oberli
patent: 4736638 (1988-04-01), Okawa et al.
patent: 4912976 (1990-04-01), Labriola, II
patent: 4939925 (1990-07-01), Sakuma et al.
patent: 5012683 (1991-05-01), Davis
patent: 5017909 (1991-05-01), Goekler
patent: 5049826 (1991-09-01), Sasao
patent: 5083470 (1992-01-01), Davis et al.

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