Analyzer, Thermo Systems electrical

The number distribution of particles having diameters from 0.03-10 urn was measured twice daily on most weekdays with a Thermo Systems electrical aerosol analyzer (EAA) ( ) and a Royco Model 202 Optical Particle Counter (OPC). These measurements were performed at a site three miles southeast of the air... 

On-line aerosol measurements were made using a Thermo-Systems, Inc., Model 3030 Electrical Aerosol Size Analyzer (EAA). This instrument uses the electrical mobility of the particles to measure the size distribution in the 0.01 to 0.5 ym range. 

Several methods were used to characterize aerosol distributions within the exposure chambers. The principal method employed a rectangular jet impactor which was inserted through a port in the chamber and used to inertially classify particles larger than 0.3 urn in diameter. As an additional index, total sulfuric acid mass use per total mass flow was calculated to give an approximation of H SO, mass per volume. Since a substantial part of the aerosol distribution in this system was below inertial impaction limits, an electrical mobility size analyzer (Thermo-... 

K. T. Whitby and W. E. Clarke, Electric Aerosol Particle Counters and Size Distribution Measuring System for the Range 0.015 to 1 Micron Size. Tellus 18 (1966), 573—585. Commercial information on the Whitby aerosol analyzer is available from Thermo Systems, Inc., 2500 Cleveland Avenue North, St. Paul, Minnesota, USA 55113. 

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