Laboratory evaluation of instantaneous reading dust monitors

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Abstract
Laboratory tests were conducted to evaluate 3 instantaneous reading respirable dust measuring instruments: the SIMSLIN II, the Tyndallometer TM-Digital and the GCA RDM-301. The SIMSLIN II and Tyndallometer employed the principle of light scattering to measure the mass concentration of respirable dust; the GCA used the principle of .beta.-ray attenuation to measure mass concentration. Simultaneous measurements with a homogenous grouping of instruments were made in coal dust aerosols ranging in concentration from 1.0-11.0 mg/m3 to establish between-instrument variability and correlation with the Isleworth Type 113A gravimetric respirable dust sampler (MRE). Between-instrument variability, expressed as the coefficient of variation, averaged 13.5% for the SIMSLIN II, 6.0% for the Tyndallometer and 13.1% for the GCA. Relationships established for comparative measurements with the MRE showed on the average that measurements with the SIMSLIN II, Tyndallometer and GCA were 18% greater, 29% less and 14% less, respectively, than measurements obtained with the MRE.

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