A laboratory comparison of the differential pressure-based dust dosimeter with the personal gravimetric respirable dust sampler on coal dust.
Marple-V; Luna-P; Olson-B; Volkwein-J; Ramami-R; Mutmansky-J; He-H
American Industrial Hygiene Conference and Exposition, June 2-7, 2001, New Orleans, Louisiana. Fairfax, VA: American Industrial Hygiene Association, 2001 Jun; :12-13
The approved gravimetric respirable dust sampler (GRO), used to measure the amount of respirable dust to which a miner has been exposed, can only provide data on the miner's exposure days after the sample has been taken. It is more desirable to have an instrument that can provide real time personal respirable dust exposure level data so that the miner can take corrective action. This need has led to the development of a respirable dust dosimeter (RDD) by the National Institute for Occupational Safety and Health. The RDD pulls air through a tube where a foam plug removes the large non-respirable particles and the respirable fraction of the dust is collected on a filter. A pressure transducer continuously monitors the pressure drop across the filter and displays the data in real time. This paper describes the results of a laboratory comparison between the RDD and the GRD. Dust from three coal seams, Pocohonatas, Pittsburgh and Kittaning, were used in the comparison and twelve RDD pressure drop/GR respirable mass correlations were made for each coal type in the range of 0.8 to 3.24 mg. All laboratory comparisons were made in a dust chamber that held six RDDs and twelve GRDs. At intervals of mass loading, three GRDs were turned off and the value of the pressure drops of the RDDs recorded. In this manner the pressure drops of the six RDDs were compared to four mass values. Each of the mass values was the average of three GRDs. Results showed that there was a linear relationship between the RDD pressure drop values and the GRD mass values. To check the resolution of the standard transducers in the dosimeters, they were compared to high-resolution transducers. In addition, a MOUDI cascade impactor measured the dust size distribution in the chamber.
Dust-samplers; Dusts; Dust-exposure; Exposure-levels; Filters; Respirable-dust; Coal-dust; Measurement-equipment; Work-environment; Mining-industry; Exposure-levels; Filters; Monitors; Laboratory-testing; Dust-particles; Dust-analysis
American Industrial Hygiene Conference and Exposition, June 2-7, 2001, New Orleans, Louisiana