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Sampling efficiency determination of aerosol sampling inlets.
Aerosols in the mining and industrial work environments, Vol. 1, fundamentals and status. Marple VA, Liu BYH, eds. Ann Arbor, MI: Ann Arbor Science, 1983 Jan; 1:321-346
A method suitable for basic studies of entire aerosol sampling inlets as well as the calibration of simple or complex inlets was described. The performance of one specific inlet was shown to demonstrate the dependence of overall sampling efficiency on air movements near the sampler. A wind tunnel was designed to incorporate this new method for determining sampling efficiencies. The inlet under study was integrated into a modified optical single particle counter that recorded the aerosol concentration penetrating the inlet. The penetrated aerosol concentration was measured dynamically and quickly for various particle sizes, sampling velocities, wind velocities and sampling angles. Extensive measurements were made using this technique of the overall sampling efficiency of a thin walled sampling tube of 0.565 centimeters internal diameter and 20 centimeters in length. The sampling efficiency of the inlet tube was studied at wind velocities of 250 to 1000 centimeters per second, inlet velocities of 125 to 1000 centimeters per second, and angles from 0 to plus or minus 90 degrees. Sampling efficiency was significantly reduced when sampling was performed at an angle to the flow. When the sampling velocity was different in the inlet from the ambient wind velocity, sampling efficiency was significantly increased or decreased.
NIOSH-Grant; Control-technology; Air-sampling-techniques; Aerosols; Aerosol-particles; Workplace-studies; Air-sampling
Environmental Health University of Cincinnati 3223 Eden Avenue Cincinnati, Ohio 45267
Aerosols in the mining and industrial work environments, Vol. 1, fundamentals and status
University of Cincinnati, Cincinnati, Ohio
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division