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Title: Improved particle impactor assembly for size selective high volume air sampler

Abstract

Air containing entrained particulate matter is directed through a plurality of parallel, narrow, vertically oriented apertures of an inlet element toward an adjacently located, relatively large, dust impaction surface preferably covered with an adhesive material. The air flow turns over the impaction surface, leaving behind, the relatively larger particles and passes through two elongate apertures defining the outer bounds of the impaction collection surface to pass through divergent passages which slow down and distribute the air flow, with entrained smaller particles, over a fine filter element that separates the fine particles from the air. By appropriate selection of dimensions and the number of inlet apertures air flow through the inlet element is provided a nonuniform velocity distribution with the lower velocities being obtained near the center of the inlet apertures, to separate out particles larger than a certain predetermined size on the impaction collection surface. The impaction collection surface, even in a moderately sized apparatus, is thus relatively large and permits the prolonged sampling of air for periods extending to four weeks. 6 figs.

Inventors:
Issue Date:
Research Org.:
Rockwell International Corp., Golden, CO (USA). Rocky Flats Plant
OSTI Identifier:
6865496
Patent Number(s):
-US-A6028981
Assignee:
TIC; EDB-88-179408
DOE Contract Number:  
AC04-76DP03533
Resource Type:
Patent
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AIR SAMPLERS; DESIGN; PARTICULATES; SAMPLING; AIR POLLUTION; INVENTIONS; EQUIPMENT; PARTICLES; POLLUTION; SAMPLERS; 500200* - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989)

Citation Formats

Langer, G. Improved particle impactor assembly for size selective high volume air sampler. United States: N. p., 1987. Web.
Langer, G. Improved particle impactor assembly for size selective high volume air sampler. United States.
Langer, G. Mon . "Improved particle impactor assembly for size selective high volume air sampler". United States.
@article{osti_6865496,
title = {Improved particle impactor assembly for size selective high volume air sampler},
author = {Langer, G},
abstractNote = {Air containing entrained particulate matter is directed through a plurality of parallel, narrow, vertically oriented apertures of an inlet element toward an adjacently located, relatively large, dust impaction surface preferably covered with an adhesive material. The air flow turns over the impaction surface, leaving behind, the relatively larger particles and passes through two elongate apertures defining the outer bounds of the impaction collection surface to pass through divergent passages which slow down and distribute the air flow, with entrained smaller particles, over a fine filter element that separates the fine particles from the air. By appropriate selection of dimensions and the number of inlet apertures air flow through the inlet element is provided a nonuniform velocity distribution with the lower velocities being obtained near the center of the inlet apertures, to separate out particles larger than a certain predetermined size on the impaction collection surface. The impaction collection surface, even in a moderately sized apparatus, is thus relatively large and permits the prolonged sampling of air for periods extending to four weeks. 6 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {3}
}