Level sensor apparatus and method

Details Level sensor apparatus and method Level sensor apparatus and method

1980-10-24

1982-04-27

Serwin, Ronald

Chemistry: physical processes

Physical processes

Crystallization

422 63, 422 64, 422100, 7386424, 7386425, 141198, G01N 114, G01N 3506

Patent

active

043268510

ABSTRACT:
A level sensor of a fluid transfer mechanism for determining when the bottom tip of a fluid aspirating probe touches or contacts the top surface of a sample fluid. The level sensor senses the contact capacitively by grounding one plate of a capacitor through the sample fluid and fluid aspirating probe. One capacitor plate is formed of an electrode biased against the bottom of a rotatable supply tray and positioned under a sample containing cavity in the tray. The other capacitor plate is formed by the bottom surface of the sample fluid in the supply cavity, and the dielectric of the capacitor is formed of the supply tray material. An AC signal is applied to the electrode and the probe is grounded. The change in voltage occurring in the AC signal at the electrode when the probe touches the top surface of the sample fluid it is sensed to provide the touch signal.

REFERENCES:
patent: 3635094 (1972-01-01), Oberli
patent: 3894438 (1975-07-01), Ginsberg
patent: 4228831 (1980-10-01), Kerns
patent: 4235840 (1980-11-01), Mendoza et al.
patent: 4276051 (1981-06-01), Ginsberg et al.
patent: 4276260 (1981-06-01), Drbal et al.

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