Avoiding bubble formation while sensing air-liquid interface usi

Details Avoiding bubble formation while sensing air-liquid interface usi Avoiding bubble formation while sensing air-liquid interface usi

1996-01-22

1997-09-09

Le, Long V.

Chemistry: analytical and immunological testing

Automated chemical analysis

With aspirator of claimed structure

436 43, 436 49, 436180, 422 67, 422100, 422106, 422112, 7386424, 7386425, G01N 3510

Patent

active

056656017

ABSTRACT:
An aspirator/dispenser of liquid has a sensor for sensing contact with the liquid by the dispense vessel, which uses constant pressure air expelled out the tip of the dispense vessel. The sensor is improved in that the line of air pressure feeding into the vessel is vented in parallel with the vessel, to the atmosphere, so that the spike of pressure occurring when the vessel encounters the liquid, is released out the vent, rather than the vessel, thus avoiding bubble formation in the liquid.

REFERENCES:
patent: 4794085 (1988-12-01), Jessop et al.
patent: 5013529 (1991-05-01), Itoh
patent: 5143849 (1992-09-01), Barry et al.
patent: 5158748 (1992-10-01), Obi et al.
patent: 5312757 (1994-05-01), Matsuyama et al.

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