Capacitive liquid level sensor for automatic chemical analyzer

Details Capacitive liquid level sensor for automatic chemical analyzer Capacitive liquid level sensor for automatic chemical analyzer

1987-03-20

1989-04-04

Marcus, Michael S.

Chemical apparatus and process disinfecting, deodorizing, preser

Control element responsive to a sensed operating condition

7386302, 7386424, 422 63, B01L 302

Patent

active

048184926

ABSTRACT:
A capacitive liquid level sensor for an automatic chemical analyzer, wherein a pipetting tube approaches a liquid level of the sample to be analyzed and is electrically connected to one terminal of an electrical bridge network. The electrical bridge network is activated by an A.C. current and produces an A.C. signal which has a phase change produced by a change in capacitance between the pipetting tube and the liquid level as the pipetting tube approaches the liquid level. The A.C. signal is converted into a D.C. signal proportional to the phase difference by means of a phase detector. A liquid level is detected by comparison of the D.C. signal with a preselected reference level.

REFERENCES:
patent: 3391547 (1968-07-01), Kingston
patent: 3635094 (1972-01-01), Oberli
patent: 3754444 (1973-08-01), Ure et al.
patent: 4228831 (1980-10-01), Kerns
patent: 4325909 (1982-04-01), Coulter et al.
patent: 4451433 (1984-05-01), Yamashita et al.
patent: 4487836 (1984-12-01), Takayanagi et al.

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