The Standard Instrument Calibration Aerosol Test System

摘要

A system for testing personal "respirable" samplers in a well characterized coal dust environment is described. Components of the system, contained in one cabinet, include a Wright Dust Feed mechanism, tritide charge neutralizer, aerosol chamber, electrostatic precipitator sampler, and a GCA Respirable Dust Monitor, in addition to air flow plumb-ing and controls.nEmployment of this test system to evaluate the per¬formance of personal "respirable" particulate air sampling instruments required variations in aerosol mass concentra¬tion with respect to time and space to be less than ±10%. Up to four personal "respirable" dust samples can be simulta¬neously operated within the coal dust cloud. More than 80 tests of 3 or 4 samplers each showed that variation of total or respirable mass concentration is ±5% within the aerosol chamber. Aerosol aerodynamic size distribution measured with Andersen cascade impactors showed the dust cloud size to be stable within ±6% throughout periods of operation up to 8 h.