Volume control system for a chromatograph

Details Volume control system for a chromatograph Volume control system for a chromatograph

1995-01-18

1996-07-02

Williams, Hezron E.

Measuring and testing

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

Content or effect of a constituent of a liquid mixture

422 70, 436161, 210656, G01N 3000

Patent

active

055311067

ABSTRACT:
A sample apparatus for a chromatogram utilizes a calibrated sample holding device such as a burette, having a liquid level sensor located at a selected height on the sample holding device. A pump is provided for transporting liquid to the sample holding device. A switch, which may be integrated with the liquid level sensor, connected to the pump such that when the selected liquid level is reached, the switch halts the flow of liquid to the sample holding device. Optionally, a second transport device provided for discharging the sample, with the second transport device utilizing an outlet valve responsive to a signal from a controller such that the sample holding device can be cyclically filled and emptied, in a sequence satisfactory to efficient operation of the chromatograph. Utilizing the apparatus of the invention, precise volumetric samples can be delivered to the device, to assure consistent analytical results from sample to sample.

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