Fluid composition and volumetric delivery control

Details Fluid composition and volumetric delivery control Fluid composition and volumetric delivery control

1987-06-20

1988-08-30

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 22, 417 53, 210101, 2101982, F04B 4900, F04B 4906

Patent

active

047672790

ABSTRACT:
An inner short-term pressure sensitive feedback loop is combined with an outer long-term volumetric delivery feedback loop to supply a substantially constant volumetric flow of mixed fluids to a load. The invention has particular utility in the controlled delivery of solvents for liquid chromatography.

REFERENCES:
patent: 3869067 (1975-03-01), Ashmead et al.
patent: 3917531 (1975-11-01), Magnussen
patent: 4045343 (1977-08-01), Achener et al.
patent: 4128476 (1978-12-01), Rock
patent: 4137011 (1979-01-01), Rock
patent: 4311586 (1982-01-01), Baldwin
patent: 4326837 (1982-04-01), Gilson
patent: 4352636 (1982-10-01), Patterson
patent: 4427298 (1984-01-01), Fahy et al.
patent: 4448692 (1984-05-01), Wakamoto
patent: 4492524 (1985-01-01), Koch
patent: 4552513 (1985-11-01), Miller
patent: 4595496 (1986-06-01), Carson
"A Versatile Gradient Elution Device for HPLC", D. L. Saunders, Journal of Chromatographic Science, vol. 15, Mar./Apr. 1977.

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