A high pressure apparatus of novel design, used for the performance ev
aluation of ceramic and polymeric membranes, is presented. The apparat
us can test the performance of several membranes simultaneously and pr
ovide significant time saving by reducing the time required for the eq
uilibration and mixing of gases. The apparatus is capable of providing
measurements of single and multicomponent permeability for pressures
up to 70 bar, under integral or differential modes of operation. (C) 1
996 American Institute of Physics.