Marple Cascade Impactor Stage Cut Points
This following comes from the Marple Impactor Operator's Manual (p. 18-19).
Use of cascade impactor data requires knowledge of the cut-points of the impactor stages. Table
8-1 gives the experimentally determined cut-points at the designed flow rate of 2 liters per minute.
| Impactor Stage No. | Cut-Point* Dp (Microns) |
| 3 | 9.8 |
| 4 | 6 |
| 5 | 3.5 |
| 6 | 1.55 |
| 7 | 0.93 |
| 8 | 0.52 |
| Backup Filter | 0 |
*Aerodynamic equivalent particle diameter for spherical particles of uniform mass
density in air at 25ºC and 1acfm.
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