Method and apparatus for auto-zeroing a flow sensor

Details Method and apparatus for auto-zeroing a flow sensor Method and apparatus for auto-zeroing a flow sensor

1999-10-13

2000-11-28

Fox, John

Fluid handling

Systems

Multi-way valve unit

73134, F16K 1185

Patent

active

061521779

ABSTRACT:
In a gas chromatograph a valve assembly for providing gradual, uninterrupted re-direction of gas flow between a flow measurement position and a bypass position. The valve assembly maintains constant gas flow through the chromatograph during transition between an auto-zeroing mode in which a flow sensor is calibrated and a flow measurement mode. The valve assembly includes a valve rotor having eccentric grooves formed for providing the desired re-direction of gas flow.

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