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Counting and particle transmission efficiency of the aerodynamic particle sizer.

Authors
Volckens-J; Peters-T
Source
J Aerosol Sci 2005 Dec; 36(12):1400-1408
NIOSHTIC No.
20029764
Abstract
The aerodynamic particle sizer (APS) measures the size distributions of particles with aerodynamic diameter between 0.5 and 20 um in real time. To provide accurate size distributions, the APS must measure both particle size and concentration correctly. The objective of this study was to characterize the counting efficiency of the APS as a function of particle size (0.8 - 10 um), particle type (liquid or solid), and APS model number (3310 vs. 3321). For solid particles, counting efficiencies ranged between 85% and 99%. For liquid droplets, counting efficiencies progressively declined from 75% at 0.8-um drops to 25% for 10-um drops. Fluorometric wash tests indicated that transmission losses occur when larger droplets impact on the instrument's inner nozzle. However, transmission losses did not account entirely for the reduced droplet counting efficiencies, indicating that additional losses may have occurred downstream of the inner nozzle. Between instrument comparisons revealed that although multiple APSs report similar number concentrations, small deviations in particle sizing can produce substantial errors when number concentrations are converted to mass concentrations.
Keywords
Aerosols; Aerosol-particles; Models; Particle-aerodynamics; Particle-counters
Contact
Department of Environmental and Radiological Health Sciences, Campus Delivery 1681, Colorado State University, Ft. Collins, CO 80523
CODEN
JALSB7
Publication Date
20051201
Document Type
Journal Article
Email Address
volckens@colostate.edu
Funding Type
Grant
Fiscal Year
2006
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T01-CCT-810435
Issue of Publication
12
ISSN
0021-8502
Source Name
Journal of Aerosol Science
State
CO
Performing Organization
Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado
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