Method and device for testing the permeability of membrane filters
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United States of America Patent
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Sep 30, 1986
Issued Date -
N/A
app pub date -
Jul 15, 1985
filing date -
Dec 27, 1982
priority date (Note) -
Expired
status (Latency Note)
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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.
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