Elution liquid control for a liquid chromatograph

Details Elution liquid control for a liquid chromatograph Elution liquid control for a liquid chromatograph

1997-03-11

1998-12-22

Brock, Michael

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

210101, 2101982, 137 7, G01N 3034

Patent

active

058522310

ABSTRACT:
In a low pressure gradient liquid chromatograph, two eluting liquids are transferred while they are being mixed with each other, whereby the mixing ratio thereof is changed with time. The mixing is performed by alternately opening and closing check valves provided in the liquid passages of the eluting liquids during a time period corresponding to the actual suction stroke of a plunger pump. The mixing ratio is determined by the time periods during which the check valves are opened, respectively. A detector is provided for detecting the pressure of the mixed liquid and the timing for opening and closing the check valves is changed in accordance with the detected pressure.

REFERENCES:
patent: 4032445 (1977-06-01), Munk
patent: 4128476 (1978-12-01), Rock
patent: 4233156 (1980-11-01), Tsukuda et al.
patent: 4595495 (1986-06-01), Yotam et al.
patent: 4767279 (1988-08-01), Dourdeville et al.

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