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Simplified Test Method to Evaluate Personal Aerosol Samplers

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  • Personal Author:
  • Description:
    INTRODUCTION: The performance evaluation of a personal aerosol sampler for the inhalable aerosol fraction (CEN, 1993; ISO, 1995) requires laboratory tests on a full-size manikin with particles up to at least 90 lun in aerodynamic diameter and wind speeds of 50 cm/s and higher (CEN, 1996). A recent collaborative study of CEN protocols for performance testing of workplace aerosol samplers (Kenny et al., 1997) clearly shows the difficulty of testing personal samplers in a large cross-section wind tunnel. The present study was initiated to simplify and reduce the cost of the suggested protocol. SIMPLIFIED TEST METHOD: The simplified test method consists of mounting several personal aerosol samplers of the same design on a static simplified torso instead of a full-size rotating manikin, as shown in Fig. 1A and B. The simplified torso consists of a rectangular three-dimensional body with rounded corners (33 cm wide, 20 cm high, 20 cm deep) to simulate the sampler's attachment to the human body. To reduce the number of experiments, the simplified torso was designed so that the personal sampler under investigation can be tested during the same run with the same aerosol and wind conditions in all three principal sampling orientations: facing the wind, 90 degrees to the wind and in the wake of the manikin. Thus, a sampler is attached in the center of each vertical face of the simplified torso. EXPERIMENTAL SETUP AND PROCEDURES: The laboratory evaluation of the simplified test method was conducted in two parts. The first part was an air flow study by carrying out flow pattern visualization and three-dimensional air velocity measurements around the test bodies (full-size torso and simplified torso) for the different sampling orientations. In the second part, the aerosol sampling efficiency of a commercially available personal aerosol sampler was compared when mounted on either of the two test bodies. Tests were performed in a large cross-section wind tunnel located at the NIOSH in Cincinnati. RESULTS: The air flow approaching a sampler mounted on a manikin depends on its location on the chest, symmetry of the full-size torso and position of the arms. The magnitude and direction of the air flow near the sampler mounted on the simplified torso were found to be comparable to the ones near the sampler mounted on the full-size torso, as shown by the air streamlines. The 3.5 I/min GSP personal aerosol sampler gives similar sampling efficiency for both test bodies when measured in the three sampling regimes at air velocities of 50 em/s and 200 cm/s with panicle of 70 Bm aerodynamic diameter. The advantage of the simplified test method is that fewer measurements need to be made and a smaller, less expensive wind tunnel can be used for the testing. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISSN:
    0021-8502
  • Document Type:
    Text
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    DPSE - Division of Physical Sciences and Engineering
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Volume:
    28
  • NIOSHTIC Number:
    nn:20056262
  • Citation:
    J Aerosol Sci 1997 Sep; 28(Suppl 1):S677-S678
  • Contact Point Address:
    O. Witschger, Aerosol Physics and Metrology Laboratory, IPSN/DPEA/SERAC, CEA-Saciay, F-91191 Gff sur Yvette, Cedex, France
  • Federal Fiscal Year:
    1997
  • Peer Reviewed:
    True
  • Source Full Name:
    Journal of Aerosol Science
  • Supplement:
    1
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:4f139970e5dacda90804f235b91e1d08822793e29afe822648c2fda9b5073dc3e1a1244fc3468b4535205e824e6cf53ca84c7550c23e9f24b7830d16582647ca
  • Download URL:
  • File Type:
    Filetype[PDF - 113.23 KB ]
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