Patent ID: 8226908

Claim:
An apparatus for volumetric quantitation or fractionation comprising: a fluidic device including a first fluidic component and at least one additional fluidic component forming a gas tight circuit capable of containing a liquid or a gas; and fluid communication means for placing the first fluidic component and the at least one additional fluidic component in gaseous or fluid communication in at least one selected metering position, wherein the gas tight circuit is in further communication with at least one purge circuit that can be used to facilitate gas or fluidic flow whereby upon a force being placed on said liquid or said gas in the first fluidic component, the fluidic communication means at said at least one selected metering position allow an unmetered amount of said gas or said liquid within the first fluidic component to escape to the at least one additional fluidic component allowing a metered amount of said gas or said liquid to remain in the first fluidic component.