Abstract
Three types of respirable dust samplers were positioned side-by-side as area samplers within three coal-fired electric power generating facilities. Respirable dust readings were taken using two direct-reading aerosol monitors (MIE PDM-3 Miniram and the TSI Model 8520 DustTrak) and the results compared to side-by-side respirable coal dust concentrations. Both direct-reading instruments use optical sensors for detecting dust concentrations, and in this study the air was passed through a 10-mm cyclone prior to detection. Respirable samples were collected using a 10-mm cyclone with a 5-µm PVC filter connected to a constant flow pump calibrated at 1.7 L/min. The samples were collected for fifteen 8-hr shifts over a one-month period. Respirable dust concentrations ranged from 0.23 to 10.83 mg/m3. The responses of each of the direct-reading instruments were compared to the respirable values. Neither of the two direct-reading instruments provided values that were identical to each other or the respirable samplers...
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