Three-stage dust sampler

Details Three-stage dust sampler Three-stage dust sampler

2006-10-03

2008-12-02

Rogers, David A. (Department: 2856)

Measuring and testing

Sampler, sample handling, etc.

With constituent separation

C073S863210, C073S863220

Reexamination Certificate

active

07458284

ABSTRACT:
A three-stage dust sampler makes use of a porous foam as the impactor substrates. The sampler includes an annular inlet which conforms to ISO/CEN/ACGIH inhalable sampling criteria, two impactor stages to classify thoracic and respirable particles and a final filter to collect respirable particles after the impactors. For 100 ppi polymer foam substrates, and a flow rate of 3.2 lpm, the collection efficiency curves of the thoracic and respirable dust matches ISO/CEN/ACGIH criteria when the jet-to-plate distance is 1.0. The cut-off aerodynamic diameter is 9.6 and 4.0 μm for the first and second impactor stages, respectively, and √{square root over (stk50)} is 0.39 for both stages. The collection efficiencies for solid particles is equal to that for liquid particles, indicating that there is no solid particle bouncing from the foam substrates.

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