Calibration of Dual-Inlet Cyclones for “Respirable” Mass Sampling

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Abstract
Three commercially available stainless steel cyclones have been evaluated for their suitability as pre-collectors in two-stage “respirable” dust samplers. The three cyclones differ in size but are similar in basic design, each having two tangential inlets 180° apart. All three closely match the ACGIH sampler acceptance criteria at a specific flowrate: i.e., 25, 75 and 430 lpm for the Aerotec ¾, UNICO 240, and Aerotec 2 respectively. If these cyclones and the similar ½ inch diameter UNICO 18 cyclone are to be used for size-selective aerosol sampling, closer quality control tolerances must be established in their manufacture., At present they are all individually assembled, and it was found that some individual units from both manufacturers were significantly different in critical dimensions and collection characteristics than the properly fabricated units. The collection efficiency of the cyclones decreases with increasing dust concentration, but the deviations expected at concentrations encountered in breathing zone or ambient sampling situations should be negligible.

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