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Multiple velocity aerosol sampling inlets to conform with revised ACGIH criteria.
NIOSH 1999 Jun; :1-24
A better evaluation of the hazard posed by airborne particles is possible if particles that do not contribute to the hazard are excluded from the airborne concentration analysis. Therefore, the criteria for the inhalable, thoracic and respirable fractions of airborne particles, proposed by Soderholm (1989), were adopted by the American Conference of Government Industrial Hygienists (ACGIH), the Comite European de Normalisation (CEN) and the International Standards Organization (ISO). However, currently available commercialized inlets, including cyclones and multi-nozzle impactors with uniform jet velocities do not comply with these revised criteria. The primary objective of this research is to develop new aerosol sampling inlets. These inlets, using an entirely new concept, can comply with size-selective aerosol sampling criteria better than the inlets currently being used. A prototype array of single stage impactors with different jet velocities has been developed in the Phase I study. The experimental results show that the impaction collection performance of the new inlet meets the proposed expectations very well in the size range of testing particles, but particle losses in the inlet body were also found to be significant. The test results showed that some design modifications would improve the performance of this device. These modifications and further testing are beyond the scope of the current Phase I work.
Airborne-particles; Standards; Industrial-hygiene; Aerosol-particles; Aerosol-sampling; Sampling-equipment; Inhalants; Equipment-design; Testing-equipment; Exposure-methods; Respirable-dust
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National Institute for Occupational Safety and Health
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