Degassing unit for high performance liquid chromatography

Used for high performance liquid chromatography systems, a degassing unit with degassing performance of high fluid replacement efficiency in a small volume is described, which is composed of (1) a flat rectangular hollow enclosure using two rectangular degassable film sheets which fringes are sealed hermetically to form an internal space, and providing two independent openings at separate positions; one for an inlet to feed eluent in and the other for an outlet to feed it out, (2) two sheet plates with a number of holes, of the same shape as that of the film sheets, each of which is closely fitted to either side of the film sheets to prevent the expansion of the hollow enclosure, (3) a degassing module having the fringe of the hollow enclosure and the fringes of the plates with holes piled in one upon another with a pair of holding frames which allow to expose the outside surface areas of the sheet plates, (4) a vacuum chamber accommodating the degassing module and enclosing the surrounding space around it, and (5) a vacuum pump which reduces a pressure in the surrounding space.