Aerosol Charge Neutralizer

Model 9000


The charge neutralizer produces a reproducible, bi-polar equilibrium particle charge distribution for scanning mobility sizer, electrostatic precipitator and particle charging experiments. The unit may also be used to bring highly charged aerosol from atomizers and other sources to charge equilibrium to help reduce electrostatic losses.

  • Easy-to-install Polonium-210 sources
  • Stainless steel construction
  • Ultra-clean high vacuum brazing construction
  • Total activity of 1 millicurie (37 MBq)
  • High maximum flow rate 5 lpm


  • Well characterized bi-polar charge distribution
  • Conveniently integrated into your sampling system
  • Easy to clean
  • Ultra-safe and inexpensive off-the-shelf sources

Technical Specs

9000 Tech Specs

parameter value
Sample flow rate 0-5 lpm
Total particle concentration Up to 100,000 cm⁻³
Construction Stainless steel
Size 1.25" dia. X 9" length/3 x 22.9 cm

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

  • Particle sampling requiring an equilibrium bipolar charge distribution
  • Continuous monitoring of ambient size distributions using the SEMS Model 2002
  • Neutralization of atomizer output for instrument characterization
  • Laboratory flow-tube reactor studies
  • Cloud condensation nucleus studies
  • Visibility reduction studies
  • Aerosol health impacts
  • Long-term climate and air quality monitoring
  • Rapid number size distribution measurements

What’s Included

The Model 9000 Charge Neutralizer comes with the following:

  • Neutralizer body with mounting bracket for two Po-210 sources
  • Detailed operating and maintenance manual
  • Vacuum leak check certification


No software is required.


The following optional accessories are available:

9000 Accessories

Part Number Description
CHG-Kit Maintenance kit for 9000 Charge Neutralizer

Related Products

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