Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1982-03-08
1984-07-31
Goldberg, Gerald
Measuring and testing
With fluid pressure
Porosity or permeability
G01M 302
Patent
active
044622481
ABSTRACT:
A device for the determination of the gas permeability of a material such as paper includes a holder 1 for holding a sample across a gas flow passage of predetermined cross section and a pump 2 for drawing air through the passageway via one or more constant flow device C.sub.1 -C.sub.6 arranged in parallel. Each constant flow device has a closable control valve V.sub.1 -V.sub.6 respectively. A first pressure transducer measures the pressure drop across the sample and a second pressure transducer, in cooperation with a lamina flow element measures the rate of air flow through the sample. A by-pass by-passes selectively three of the control valves of the constant flow devices. The by-pass has valves B.sub.1 -B.sub.3 arranged in parallel and operable to close the by-pass to gas flow therethrough to the respective constant flow devices C.sub.1 -C.sub.6.
The by-pass also includes an atmospheric bleed 11 and a valve B.sub.4 closable to stop the flow of air into the by-pass.
REFERENCES:
patent: 4191046 (1980-03-01), Baker et al.
patent: 4198854 (1980-04-01), Washington et al.
patent: 4348887 (1982-09-01), Lorenz et al.
British-American Tobacco Company Limited
Goldberg Gerald
Williams Hezron E.
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