Respirable particle sampling instruments

Gas separation – With nonliquid cleaning means for separating media – Solid agent cleaning member movingly contacts apparatus

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Details

55372, 55472, 55473, 55482, 55487, 55524, 55528, 55DIG24, 55DIG35, 55DIG42, 73 28, 7386323, 12820125, B01D 5000

Patent

active

043505074

ABSTRACT:
A respirable particle sampling instrument passes air with a fan through a passage having first a pre-filter thereacross to collect non-respirable airborne particles and then a main filter to collect respirable particles, the pre-filter being formed by a random fibrous network having interstices of such size and distribution as to capture a major proportion of the non-respirable particles within a prescribed range of velocity for which particle capture is predominantly by inertial impaction. The pre-filter suitably comprises porous foamed plastics material, preferably in a structure of contiguous layers having successively changing pore sizes and distribution, preferably of a polyester, and preferably having an oil coating. The pre-filter will normally have a penetration function approximating the so-called Johannesburg curve.

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patent: 3657992 (1972-04-01), Minnick, Jr.
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Brink, Jr., J. A. and Porthouse, J. D., "Efficient Dust Control Via New Sampling Technique", Chemical Engineering, (Mar. 10, 1969), pp. 106-110.

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