Pumped Counterflow Virtual Impactor (PCVI)

Model 8100


The 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.

  • Coarse particles delivered with sharp size cut into exit flow
  • Broad cut size range
  • Easy to disassemble and clean
  • Designed to maintain tight concentricity between inlet jet and counterflow
  • Stainless-steel construction


  • Characterized cut size performance in the peer-reviewed literature
  • Changeable cut size by changing air flow rates
  • Broad pressure operating range
  • Compatible with Brechtel automated 3-way valve to allow switching between coarse & fine particle flows

Technical Specs

PCVI Tech Specs

parameter value
Diameter cut size 0.3 to 5 microns
Sample inlet flow rate 5-20 lpm
Sample outlet flow rate 0.5-3 lpm
Add flow rate 2-8 lpm
Operating pressure 50-1,000 mb
Operating temperature 10-50°C

Copyright ©2017 All specifications are subject to change without notice. BMI assumes no responsibility for inaccuracies in this document or for any obligation to update information in this document. BMI reserves the right to change, modify, transfer or otherwise revise this publication without prior notice.

*Some products may be shown with optional accessories, which are sold separately. Items shown may not be to scale.

Applications and Solutions

  • 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

What’s Included

  • PCVI unit
  • Operating manual
  • Vacuum leak check certification


No software is required.


The following optional accessories are available:

PCVI Accessories

Part Number Description
PCVI-MFCv Mass flow controller for PCVI (0-50 lpm flow range, vacuum downstream of valve)
PCVI-MFCp Mass flow controller for PCVI (0-50 lpm flow range, pressure upstream of valve)
PCVI-Noz Nozzle for 8100 PCVI
PCVI-Kit Maintenance Kit for 8100 PCVI


PCVI Brochure

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