Measuring and testing – Sampler – sample handling – etc. – With constituent separation
Patent
1992-03-16
1994-09-06
Raevis, Robert
Measuring and testing
Sampler, sample handling, etc.
With constituent separation
G01N 1502
Patent
active
053437675
ABSTRACT:
The present invention relates to a low particle loss cascade impactor with particle collection in externally removable cups for determining the size distribution of particles delivered form an aerosol atomizer. A plurality of downwardly facing cavities formed in the body are arranged from a first end to a second end of the body in a generally zig-zag pattern. Each cavity has a generally cylindrical inner wall surface defining an opening facing in a second direction and a surface facing in a first direction. An entrance passage extends from the outer surface of the body at the first end to a center region of a first cavity. The impaction stage is positioned such that a center line of the impaction stage intersects a center bisecting plane passing through the body at an included angle between about 10.degree. to 80.degree.. The body has a plurality of cavity passages which extend between adjacent cavities from the inner wall of one cavity adjacent the outlet opening of that cavity to a central region of the adjacent cavity. Nozzles are formed in the entrance passage and in each cavity passage. Part of the collection and impaction surfaces are provided adjacent to each cavity for the collection of particles. An airflow generator connected to the cavity next adjacent the second end of the body causes air to flow into the body at the entrance passage and flow through the plurality of cavities via the cavity passages.
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"Stimuli to the Revision Process," Report and Recommendations of the USP Advisory Panel on Aerosols on the USP General Chapter (601) Aerosols, 1991, pp. 1703-1713.
Marple Virgil A.
Miller Nicholas C.
MSP Corporation
Raevis Robert
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