Dual-head flow controller and method

Details Dual-head flow controller and method Dual-head flow controller and method

1993-09-03

1995-01-10

Nilson, Robert G.

Fluid handling

Processes

73 6171, 137593, G01N 1506

Patent

active

053797914

ABSTRACT:
A dual-head flow controller having a positive-head and a negative-head for supplying a sample fluid from a source to a restriction at a constant rate, with the magnitude of the negative head about the same as that of the positive head, independent of the pressure of the source fluid. A positive-head tube having a distal open end connects for fluid communication with the supply. The positive-head tube extends a first predetermined distance above a mean elevation of the restriction in the measuring chamber. A negative-head tube communicates fluid from the restriction to a distal open end. A portion of the negative-head tube extends downwardly a second distance below the mean elevation of the restriction. The fluid, being communicated in response to the combined head pressures, flows at a constant rate through the restriction, independent of changes in the pressure of the source fluid.

REFERENCES:
patent: 2523634 (1950-09-01), Pyle
patent: 4317539 (1982-03-01), Pollock
patent: 4492921 (1985-01-01), Sandulyak
patent: 5211677 (1993-05-01), Sargeant
Model 211 Sensor Owners Manual (Preliminary), Oct. 1988, Met One, Inc., Grants Pass, Oreg.
"Your Greatest Liquid Assets", Met One, Inc. (undated).
Specification Sheet for Model 400 Flo-Controller, McMillan Company, 1991.

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