Thermo Scientific™

Two-Stage Viable Andersen Cascade Impactor

 Related applications:
Collect 95 to 100% of the viable particles above 0.8 microns in an aerosol on a variety of bacteriological agar using the Thermo Scientific™ Two-Stage Viable Andersen Cascade Impactor. This multi-orifice impactor can be used whenever a size distribution is not required and only respirable-nonrespirable segregation or total counts are needed.

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A reusable aluminum sampler separates viable particles into two size ranges with the 50% cut-off diameter of Stage 1 at 8.0 microns for spherical particles of unit density.

Key Features:

  • The impactor is constructed with two aluminum stages that are held together with three dowel pins and three PTFE caps. Each impactor stage contains multiple precision-drilled orifices
  • Collection plates are prepared by aseptically pipetting 20mL of sterile bacteriological agar into each of the two glass Petri dishes supplied with instrument
  • Air to be sampled enters the jet orifices of Stage I and cascades through the jet orifices of Stage II with a higher orifice velocity (as compared to Stage I); smaller particles are inertially impacted on the agar plate more in Stage II than in Stage I
  • Viable particles are retained on the agar plates, and the exhaust air is carried through the outlet in the base of the instrument to the vacuum source
  • The unit requires a flow rate of exactly 28.3L/min (1cfm) for maximum collection efficiency


Vacuum pump (see specifications).

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