Thermo Scientific™

Eight-Stage Non-Viable Andersen Cascade Impactor

 Related applications:

Sample wet or dry particulates with the Thermo Scientific™ Eight-Stage Non-Viable Andersen Cascade Impactor. First in its class, the impactor is the original design cited as the world's reference for aerosol particle sizing. The impactors are uniquely defined as a primary standard classification device thanks to performance verification through well-established fundamental physical principles. It is a multi-stage, multi-orifice sampler used in environmental working areas to measure the size distribution and mass concentration levels of solid particulates and liquid aerosols.

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The combination of a constant flow rate and successively smaller diameter orifices increase the velocity of sample air as it cascades through the sampler, resulting in the impaction of progressively smaller particles in the succeeding stages. Operating at 28.3 liters per minute (LPM), the particle fraction ranges from 0.4 to >10.0 mirometers in diameter. Particles too small to be impacted on the last collection plate are collected in the backup filter. Optional accessories allow for additional research operations at 60 and 90 PLM.

Key Features:

  • Gravimetric analysis allows reference method precision
  • Ease of operation and calibration
  • Particle bounce and wall losses virtually eliminated
  • High mass collection and high flow rate
  • Gravimetric or chemical sample analysis
  • Stainless-steel, glass, and filter substrates available

Additional Information:

  • Each sampler comprises eight aluminum stages held together by three spring clamps and gasketed with O-ring seals. Each contains multiple precision-drilled orifices.
  • Ambient gases enter the inlet cone and cascade through the succeeding orifice stages with successively higher orifice velocities from Stage 0 to Stage 7.
  • Successively smaller particles are inertially impacted onto the collection plates. Submicrometer particles, which are not collected by the last collection plate, are caught in the backup filter, which is an integral part of the impactor immediately downstream from Stage 7.
  • Stage 0 is an orifice stage only, while Stage 8 is a collection stage only. Each sampler requires a flow rate of exactly 28.3L/min. (1 cfm) for maximum efficiency.

Recommended for:

  • Pharmaceutical applications
  • Studying ventilation
  • Indoor or outdoor air quality
  • Hazardous waste sites
  • Emergency response situations
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