![]() Charge the pumps completely before beginning.(Please note the use of a rotameter is an industry standard and not part of the NIOSH 7400 method.) Pump calibration: Stopwatch and bubble tube/burette, electronic meter, or rotameter. ![]() Wire, multi-stranded, 22-gauge 1”, hose clamp to attach wire to cassette.(0.80 μm pore size filters are recommended for PCM analysis and 0.45 μm pore size filters are recommended for TEM analysis.) Sampler: field monitor, 25-mm, three-piece cassette with 50-mm electrically conductive extension cowl and cellulose ester filter, 0.45 to 1.2 μm pore size and back up pad.So for some exposures, substantially more fibers may be present than are actually counted. The smallest visible fibers detected by PCM usually are about 0.2 μm in diameter while the finest asbestos fibers may be as small as 0.02 μm in diameter.Other fibers that are not asbestos may be included in the count. The analytical technique does not positively identify asbestos fibers.Phase contrast is a fiber counting technique that excludes non-fibrous particles from the analysis. The analytical technique is specific for fibers.To assess whether the levels present suggest an elevated fiber concentration.To capture and quantify the amount of airborne asbestos and non-asbestos fibers present in the air.Note: While this guide recommends common practices, other requirements might vary by state and/or agency. Asbestos PCM Air Sampling Air Sampling for PCM Analysis
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