A NEW GENERATION OF LIGHT-SCATTERING INSTRUMENTS FOR RESPIRABLE DUST MEASUREMENT *

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Abstract
The optical determination of respirable dust concentration by light scattering is a suitable method for obtaining immediate information, provided that there is a good relationship with results obtained with gravimetrical dust samplers. The Tyndallometer TM digital and its MK 2 version, the TM digital μP, have been constructed to match the definition for respirable dust. Experiments in wind tunnels and workplaces have shown that the responses of these instruments are proportional to the mass concentration of the respirable dust fraction. Up to now, no influences of particle refractive index or density on the ratio of optical to gravimetric values have been found. However, there are particle size effects, especially with very fine or very coarse aerosols, such that no general conversion factor can be given. The TM digital μP is a portable software-controlled instrument. The version with advanced software has an internal memory from which the measured data can be output using plotters or printers.

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