TSI Instruments SMPS 3938 - APPENDIX B Theory of Operation; Impaction Theory and Operation; Classifier Shown with Impactor Installed on Inlet; Cross-Sectional View of an Inertial Impactor [Hinds, 1982

Theory of Operation B-3
Impact i o n Theor y a n d Oper a t i o n
The aerosol first enters an impactor mounted on the exterior of the
classifier (see Figure B-1), which removes particles above a known particle
size by inertial impaction. The aerosol flow is accelerated through a nozzle
directed at a flat plate (see Figure B-2).
Figure B-1
Classifier Shown with Impactor Installed on Inlet
Impaction
Nozzle or
Jet
Stream Lines
Impaction
Plate
Figure B-2
Cross-Sectional View of an Inertial Impactor [Hinds, 1982]