Evaluation of Size-Selective Presamplers: I. Theoretical Cyclone and Elutriator Relationships

Relationships of airborne dust concentrations measured by cyclone and elutriator size-selective presamplers are presented. Cyclone efficiency is assumed to fallow the Los Alamos criterion, and that of the elutriator the British Medical Research Council criterion. Cyclone-elutriator ratios are given for log-normally distributed aerosols with a count median diameter range of 0.1 to 11.0 microns and a mass median diameter range of 0.2 to 16 microns for geometric standard deviations of 1.1 to 3.0. For usual heterogeneous industrial dust clouds, the ratio is 0.81 ± 0.11. For these same dust clouds the cyclone passes from 2% to 75% of the total dust, and the elutriator from 4% to 81%.