U.S. flag An official website of the United States government.
Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

i

Counting and Particle Transmission Efficiency of the Aerodynamic Particle Sizer



Details

  • Personal Author:
  • Description:
    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. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISSN:
    0021-8502
  • Document Type:
    Text
  • Funding:
    Grant
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Volume:
    36
  • Issue:
    12
  • NIOSHTIC Number:
    nn:20029764
  • Citation:
    J Aerosol Sci 2005 Dec; 36(12):1400-1408
  • Contact Point Address:
    Department of Environmental and Radiological Health Sciences, Campus Delivery 1681, Colorado State University, Ft. Collins, CO 80523
  • Email:
    volckens@colostate.edu
  • Federal Fiscal Year:
    2006
  • Performing Organization:
    Colorado State University, Fort Collins, Colorado
  • Peer Reviewed:
    True
  • Start Date:
    19940701
  • Source Full Name:
    Journal of Aerosol Science
  • End Date:
    20050630
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:81129400f82e0e3fa1d83c0f6d3c41423d687d336fee45fa1754238eaceb128c1eda4dc61d4dd9c06137ea48830d2d424f77611287d78b0165fd516ab8977f3f
  • Download URL:
  • File Type:
    Filetype[PDF - 200.71 KB ]
PREVIOUS
ON THIS PAGE
Details
CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners.

As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.
BACK TO TOP