Accession Number : AD0692320

Title :   STUDIES ON THE PERFORMANCE OF THE ROTOROD FP SAMPLER.

Descriptive Note : Memorandum rept.,

Corporate Author : METRONICS ASSOCIATES INC PALO ALTO CALIF AEROSOL LAB

Personal Author(s) : Grinnell,S. W. ; Webster,F. X. ; Brown,T. S.

Report Date : 23 JUN 1965

Pagination or Media Count : 77

Abstract : Because of its high volume sampling rate and low power requirements, the Rotorod Sampler offers several advantages over use of the membrane filter in FP (fluorescent particulate) air tracer studies, but the impaction process is not 100% efficient in the FP size ranges now employed. However, data presented in this report show that when apparent dosages from Rotorod sampling are corrected for the average efficiency obtained from a given lot of FP, the dosages obtained are consisted with those obtained from closely adjacent membrane filters exposed to the same FP cloud. In the 154 comparisons reported standard deviations range from 6% to 10%, and improved experimental conditions would probably indicate considerably smaller deviation. Efficiencies with two different rod-coating methods are alike within about 3%, and no significant difference in efficiency was found between Rotorods oriented in the standard vertical position and those oriented horizontally. The relationship between particle size distribution parameters and Rotorod efficiencies is discussed. (Author)

Descriptors :   (*TRACER STUDIES, ATMOSPHERES), (*AEROSOLS, SAMPLERS), (*SAMPLERS, EFFICIENCY), FLUORESCENCE, PARTICLE SIZE, IMPACT, DOSAGE, AIR FILTERS, MEMBRANES, RODS, COATINGS, ADHESION, EXPERIMENTAL DATA, ERRORS, COLLECTING METHODS, PERFORMANCE(ENGINEERING)

Subject Categories : Meteorology
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE