Patent ID: 7225690

Claim:
A sample cylinder, comprising: a body having a chamber formed therein; a flexible isolation barrier situated within said chamber, said flexible isolation barrier selectively dividing said chamber into first and second cavities; an inlet valve associated with said first cavity; and a purge valve associated with said second cavity; whereby, upon allowing a flow of pre-charge gas through said purge valve, said isolation barrier is urged toward said first cavity, displacing residual gas in said first cavity, with said flexible isolation barrier conforming to the interior of said first cavity; and whereby, upon pressurizing said second cavity via said purge valve with a pre-charge gas at a pressure, and flowing a sample gas through said inlet valve and into said first cavity, said flexible isolation barrier, receiving pressure from said pre-charge gas from said second cavity, provides controlled flow of said sample gas into said sample cylinder via selective venting of said pre-charge gas from said second chamber, until said pre-charge gas is depleted from said second cavity, said flexible isolation barrier conforms to the interior of said chamber, and said chamber is filled with said sample gas.