|The Cascade Centripeter is an instrument developed to obtain information on the concentration and size distribution of aerosols. The unit is mounted on a BTS601 Air Sampler utilising the 6cm Filter Holder.|
The instrument is in the form of a tube approximately 38mm diameter and 180mm long in which air cascades through a series of three orifices of diminishing diameter and successively finer fractions of the aerosol are collected by the nozzles located behind them. The separated particles are retained on circles of glass fibre filter paper inserted behind the nozzles in a manner convenient for weighing, microscopical examination or radio assay. When sampling at 30 litres per minute, the diameters of the unit density spherical particles collected by the three stages lie largely within the ranges > 14 microns, 4 to 14 microns and 1.2 to 4 microns, the smallest particles less than 1.2 microns which escape removal by the three centripeter stages are collected by a final 6cm filter paper through which all the air passes.
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