Dry-Powder Aerosol Dispersing Device with Long-Time Output Stability

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Abstract
Operating parameters and performance characteristics are described for a dry‐powder Fe2O3aerosol disperser used for periods up to 23 h with minimal operator attention. Aerosol mass concentration fluctuations in a 3 m3 dynamic‐flow chamber were determined over 23‐h periods for the aerosol generator with and without electronic feedback circuits. From the data presented in this paper and from observations made during 2 weeks of continuous operation, this ``rust duster'' was found to be capable of continuously dispersing Fe2O3powder into 1.5 m3 of air per minute to produce aerosols having median concentrations from about 0.7 to 3.0 mg m−3. Over most of this concentration range, with or without the feedback control circuit, the mass concentration of Fe2O3aerosol was kept within the ±50% variability limit originally set as acceptable for chronic animal exposure conditions.

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