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 Figure 2g. Dorr-Oliver 10-mm nylon cyclone. Used as a respirable sampler most often at 1.7 L/min. A version of this sampler is used at 2 L/min in coal mines with a 1.38 correction factor applied to the resultant mass. The holder encases body of the cyclone so that only the inlet section is visible just below the connection to the 37 mm cassette. The coal mine dust sampler version uses a cassette with an aluminum cartridge encasing the collection filter.

Figure 2h. Higgins-Dewell cyclone. Developed and used primarily as a respirable sampler in the UK. This version provides an interface directly to a 37-mm cassette. Cyclone construction is steel and operates at 2.2 L/min.

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NIOSH Manual of Analytical Methods