A COMPACT HIGH-FLOWRATE RESPIRABLE DUST SAMPLER: THE CPM3

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Abstract
The technical characteristics of the portable self-energized respirable dust sampler CPM3 are described. This instrument was originally developed in France in the 1970s by the Centre d'Etudes et Recherches de Charbonnages de France (CERCHAR) for use in coal mines; it is now also widely used elsewhere for industrial hygiene measurements. A high-speed rotating cup containing two layers of polyurethane foam provides the suction of the ambient aerosol at a high flowrate, 50 l. min −1 , and at the same time acts like a filter and traps the respirable particles that penetrate the cyclone-type preselector. The sampling characteristics (in calm air conditions only) were studied using two polydisperse test aerosols: coal and aluminium oxide (Aloxite 50). The particle collection efficiency of the instrument is shown to be very close to the conventional selectivity for the alveolar fraction as defined by ISO. The experimental results are compared with those obtained in similar conditions for two reference instruments: the U.S. 10-mm Dorr-Oliver cyclone at 1.7 l. min −1 and the British MRE Type 113A Gravimetric Sampler (Casella Ltd, London) at 2.5 l. min −1 .

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