The Pumped Counterflow Virtual Impactor (PCVI) is a virtual impactor that allows on-line separation of coarse from fine aerosol. The separation size is variable over the 0.3 to 5 micron diameter range, and the device is small enough to fit in the palm of your hand. With two mass flow controllers, the flows inside the PCVI can be varied to quickly change the particle size that passes through the counterflow and into the sample outlet flow.


  • Characterized cut size performance in the peer-reviewed literature
  • Changeable and broad cut size range by changing air flow rates
  • Broad pressure operating range
  • Easy to disassemble and clean
  • Stainless-steel construction
  • Designed to maintain tight concentricity between inlet jet and counterflow


  • Separation of coarse from fine aerosol
  • Ice chamber/ice nucleation studies
  • Ambient dust composition and size distribution studies
  • Laboratory cloud condensation nucleus studies
  • Fine/coarse PM chemical composition monitors
  • Any experiment or sampling situation requiring separation of coarse and fine aerosol

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