Method and apparatus for metering a fluid

Details Method and apparatus for metering a fluid Method and apparatus for metering a fluid

1997-08-06

1998-11-10

Ludlow, Jan

Chemistry: analytical and immunological testing

Automated chemical analysis

With a continuously flowing sample or carrier stream

422 81, 422 82, 422100, 436 53, G01N 3508, G01N 3510

Patent

active

058343148

ABSTRACT:
Embodiments disclosed involve methods and constructions for metering, and in some instances combining, fluids. One such method includes fluidly connecting a source of first fluid to be metered with a pressure source capable of moving the first fluid with a first valve and a conduit. The first valve is operated such that first fluid moves in the conduit. The conduit is fluidly connected with a source of second fluid that has a fluid flow rate greater than the first fluid with a second valve. The second valve is operated such that the second fluid moves into the conduit. One construction for metering a fluid comprises a source of first fluid to be metered, a pressure source for moving the first fluid to be metered, and a first valve. A conduit fluidly connects the source of first fluid, the pressure source for moving the first fluid and the first valve such that operation of the first valve causes movement of the first fluid responsive to the pressure source. A second valve fluidly connects a source of second fluid that has a fluid flow rate greater than the first fluid with the conduit such that operation of the second valve causes movement of the second fluid into the conduit.

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