Liquid proportioning system in a liquid sample analyzer

Details Liquid proportioning system in a liquid sample analyzer Liquid proportioning system in a liquid sample analyzer

G - Physics

01

F

50/1, 73/124

G01F 11/28 (2006.01) G01N 1/38 (2006.01) G01N 31/22 (2006.01) G01N 33/48 (2006.01) G01N 35/08 (2006.01)

Patent

CA 1043128

ABSTRACT OF THE DISCLOSURE 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 afore- mentioned 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. - 1 -

241493

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