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Performance characteristics of the multicyclone aerosol sampler.

The multicyclone aerosol sampler of Lippmann and Kydonieus has been redesigned for use in underground coal mines. It now includes an intrinsically safe battery-powered brushless dc motor coupled to a vane pump. Particles are collected by seven parallel samplers which surround a common inlet. Six samplers consist of a 10-mm nylon cyclone and a filter in series. Each cyclone operates at a different flow and has a different size cut. The seventh sampler is a filter alone. Analysis of the seven filter samples permits the construction of a size-mass distribution curve describing the airborne aerosol. Cyclone collection efficiencies were determind for aerodynamic particle sizes from 0.3 to 8 microns and for flow rates between 0.9 and 30 liters/min. The effects of particle electric charge, cyclone orientation, aerosol concentration, sample mass collected, and sampling rate pulsations on cyclone collection were also determined.