Measuring and testing – Sampler – sample handling – etc. – With constituent separation
Patent
1994-04-06
1995-08-01
Raevis, Robert
Measuring and testing
Sampler, sample handling, etc.
With constituent separation
G01N 100
Patent
active
054371988
ABSTRACT:
A universal impactor for sampling airborne particles has a slit nozzle that tapers in width along its length. The slit nozzle is in a plate that is thicker near wide parts of the slit and is thinner near narrow parts of the slit. An impaction plate beneath the slit is wider below wide parts of the slit and narrower below narrow parts of the slit. The impaction plate is sloped so that the impaction surface is at a greater distance below wide parts of the slit, and at a lesser distance below narrow parts of the slit. A passage adjacent to the impaction plate allows penetration of unimpacted particles to a particle collector or sensor. An air mover provides flow through the apparatus. The impactor has a particle impaction efficiency that varies smoothly with particle size and a curve of particle penetration efficiency vs. particle size that closely meets any predetermined sampling criteria.
REFERENCES:
patent: 2538116 (1951-01-01), May
patent: 3518815 (1970-07-01), McFarland et al.
patent: 4133202 (1979-01-01), Marple
patent: 4350507 (1982-09-01), Greenough et al.
patent: 4400982 (1983-08-01), Bell
patent: 4452068 (1984-06-01), Loo
patent: 4463595 (1984-08-01), Yeh et al.
patent: 4670135 (1987-06-01), Marple et al.
patent: 4764186 (1988-08-01), Langer
patent: 4972957 (1990-11-01), Liu et al.
patent: 5040424 (1991-08-01), Marple et al.
Air Sampling Procedures Committee: Particle Size-Selective Sampling in the Workplace. American Conference of Governmental Industrial Hygienists, Cincinnati, Ohio (1985).
U.S. Environmental Protection Agency: Revisions to the National Ambient Air Quality Standards for Particulate Matter. Fed. Reg. 52:24634-24750 (1987).
Davies, C. N. Dust Sampling and Lung Disease, Br. J. Ind. Med. 9:120 (1952).
Marple, V. A., Simulation of Respirable Penetration Characteristics by Inertial Impaction. J. Aerosol Sci. 9, 125-134, (1978).
American Conference of Governmental Industrial Hygienists: Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices, 1993-1994, Cincinnati, Ohio.
Marple et al., Personal Sampling Impactors With Respirable Aerosol Penetration Characteristics, Am. Ind. Hyg. Assoc. J. 44:916-922 (1983).
Tomb et al., A New Two-Stage Respirable Dust Sampler. Am. Ind. Hyg. Assoc. J. 36:1 (1975).
Creighton Wray James
Raevis Robert
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