Patent ID: 8136387

Claim:
Test apparatus for using a flow porometer to determine pore structure characteristics of at least a portion of a filtration cartridge, comprising a porometry test location isolating device having means for directing flow of a pressurized test gas through only a preselected test location along the length of said filtration cartridge, means for applying pressure in small increments to said test location, means for measuring differential pressures of said test gas, and means for measuring a rate of flow of said test gas through said test location, wherein said test location isolating device is selected from the group consisting of inserts, rings, and sleeves that slidingly engage either an inner or outer surface of said filtration cartridge and direct said test gas through said test location of said cartridge, wherein said test location isolating device comprises a ring adapted to slidingly engage an outer surface of a cylindrical filtration cartridge, comprising: a) a ring member having a groove within an inner surface thereof defining a central gas channel connected to a test gas inlet, said central gas channel arranged to direct flow of said test gas through said ring member to said preselected test location of said cartridge; and b) a pair of gaskets seated within a pair of gasket grooves arranged on each side of said central gas channel, said gaskets defining said test location and confining flow of said pressurized test gas through said test location.