Dispensing – Processes of dispensing
Patent
1975-04-02
1977-01-11
Yudkoff, Norman
Dispensing
Processes of dispensing
23230R, 23230B, 23253R, 23259, 222145, 222318, B67D 560, G01N 3122, G01N 3316
Patent
active
040022692
ABSTRACT:
A liquid sample analyzer having a first fixed-volume chamber into which a first liquid is flowed filling it for subsequent displacement of the liquid volume therefrom by a second liquid into a substantially larger second fixed-volume chamber through a first port thereof, the second liquid acting as a pilot fluid. Prior to such liquid volume displacement from the first chamber, the second chamber, having an overflow outlet at a location remote with respect to the first port, is washed out and filled to an overflow level by a flow of the second liquid entering the second chamber through a second port. On such displacement of the volume of the first liquid into the second chamber, the last-mentioned volume and a relatively small volume of the second liquid entering the second chamber displace from the second chamber through the aforementioned outlet an equivalent volume of the second liquid, so that a reproducible volume of the first liquid remains in the second chamber with a reproducible volume of the second liquid. In this manner, the volumes of such liquids are precisely proportioned with substantial independence with respect to flow rates. One of the liquids may be a sample and the other may be a diluent. Sample analysis may take place in the second chamber prior to evacuation of the chamber contents therethrough the second port.
REFERENCES:
patent: 2953155 (1960-09-01), Cummings
patent: 2995425 (1961-08-01), Fuhrmann
patent: 3028225 (1962-04-01), Sheen
patent: 3085717 (1963-04-01), Anscherlik
patent: 3241921 (1966-03-01), Ferrari
patent: 3437447 (1969-04-01), Harmon
patent: 3572130 (1971-03-01), Goldsmith
patent: 3743103 (1973-07-01), Isreeli
patent: 3831618 (1974-08-01), Liston
patent: 3858450 (1975-01-01), Jones
Hollander Barry I.
Technicon Instruments Corporation
Yudkoff Norman
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