Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1985-07-15
1986-09-30
Levy, Stewart J.
Measuring and testing
With fluid pressure
Porosity or permeability
G01N 1508
Patent
active
046141090
ABSTRACT:
The invention pertains to a method and device for testing the permeability of membrane filters by submitting a wetted membrane filter on its inlet side to a predetermined testing gas pressure within a first closed system and by measuring pressure variation over time within the closed system. The object of the method of the invention is a sensitive testing method permitting permeability, and thus pore size, of a membrane filter to be determined exclusively by measurements performed on the inlet side of the membrane filter. Such measurement is performed by measuring a pressure differential with respect to a reference pressure, or by measuring the quantity of gas per unit of time flowing with respect to a reference pressure system, or else by measuring the pressure differential twice and draining, during the second measurement, a predetermined quantity of gas from the space being tested.
REFERENCES:
patent: 3336793 (1967-08-01), Tuttle
patent: 4384474 (1983-05-01), Kowalski
patent: 4385517 (1983-05-01), Sorce et al.
patent: 4449392 (1984-05-01), Huschke
Brock, T. D. Membrane Filtration: A User's Guide & Reference Manual, Science Tech, Inc., pp. 134-135, 1983.
Olson, W. P. A System for Integrity Testing of Disc and Cartridge Membrane Filters, In Pharm. Tech., vol. 6 (5), 1982, pp. 42-52.
Brunswick Corporation
Levy Stewart J.
Roskos Joseph W.
Waldron James S.
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