Performance considerations for size-selective samplers.
Ann Am Conf Gov Ind Hyg 1984 Dec; 11:97-100
Sources of error and general performance of particle size selective samples are examined. The variability among samples is represented by the precision of the instrument and is largely due to random errors. The suitability of a particle sampler is defined by its conformance to size selective sampling criteria recommended by the Air Sampling Procedures Committee of the American Conference of Governmental Industrial Hygienists. Accuracy criteria consists of requiring the regression equation which fits the data to fall within the boundaries of the particle size selective criteria. The regression equation should fit the test data points with a minimum correlation coefficient of 0.90. Control of the sampling flow rate is one of the most common sources of error. Effects of pulsation appear to be minimal when pulsation dampeners are employed in the pumps. Ambient air speed and direction may have significant effects on performance. The minimum operating control is between minus 10 to minus 20 degrees-C. Over loading the sampling capacity of the sampler is also a problem. The accuracy with which a filter must be pre weighed is influenced by the weight of the sample to be measured. The author concludes that a calibration test method should be highly consistent to evaluate the precision of a sampling system.
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