Patent ID: 6786105
Filing Date: 2004-09-07
Classification: G01N

Abstract:
A device comprising:an inlet port at a first end; a pump fluidly connected to the inlet port; a plurality of orifice plates, each orifice plate comprising an orifice; a plurality of impactor stage plates, each impactor stage plate comprising an impaction surface having a predetermined cutpoint for particulate matter, which allows characterizing particles from about 10 &mgr;m to less than 0.25 &mgr;m; and a filter plate at a second end, wherein the inlet port is fluidly connected to the filter plate such that a pressure drop from the first end to the second end is between about 8 and 15 inches of H2O with a flow rate of between 7 and 11 liters per minute (LPM), each orifice plate and impactor stage plate alternately disposed between the first end and second end, wherein each orifice plate is immediately followed by an impactor stage plate.