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Figure 2e. Asbestos sampling cassette. The long (50 mm) inlet was designed to prevent incidental contact with the filter surface and, when facing downward, acts to a certain extent as an elutriator, preventing larger particles from reaching the filter surface. Made of conductive plastic and is operated at a flow rate between 0.5 L/min to 16 L/min.
Figure 2f. Bell mouth cowl sampler. An alternative to the standard asbestos sampling cassette. The inlet is flared to reduce the effect of external air motion on sample uniformity. Made of conductive plastic and is operated at a flow rate between 0.5 L/min to 16 L/min.
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NIOSH Manual of Analytical Methods
