Method and device for testing the permeability of membrane filters
US4614109A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1985 |
| Grant date | Sep 30, 1986 |
| Priority date | — |
| Expiry date | Jul 15, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2015/086
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.