Chromotographic pumping system

Details Chromotographic pumping system Chromotographic pumping system

F - Mech Eng,Light,Heat,Weapons

04

B

341/38

F04B 49/06 (2006.01) G01N 30/32 (2006.01)

Patent

CA 1284366

PUMP ABSTRACT OF THE DISCLOSURE To provide smooth constant flow, a liquid chromatographic system comprises: a chromatographic column having an inlet; a pump for supplying fluid to the inlet of the chromatographic column; a power means for a pump motor; a feedback loop means for controlling said power means; means for alternately energizing and de-energizing said positive and negative feedback control means; said negative feedback control means receiving a signal from said means for measuring flow rate and including means for comparing said signal with said corrected flow rate reference signal while said second feedback loop is energized to generate an error signal controlling said power means; and said positive feedback control means applying an acceleration voltage to said motor from a time a preset period after the initiation of a return stroke of said iston until after a timed duration.

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