Patent ID: 8136388

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 pair of sleeves adapted to slidingly engage an outer surface of a cylindrical filtration cartridge, comprising: a) a pair of tight fitting rubber sleeves slidingly engaged at each end of a filtration cartridge, said rubber sleeves defining said test location and confining flow of said pressurized test gas through said test location; and b) a test gas inlet located at an end of one of said sleeves, and a sealed end located at an end of the other of said sleeves, with said cartridge being arranged between said sleeves.