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

Aerosol Charge Neutralizer

parameter value type
Sample flow rates 0-5 lpm
Total particle concentrations Up to 100,000/cc
Construction Stainless steel
Compact Size 9"L x 1.25" dia.

Copyright ©2014 All specifications are subject to change without notice. BMI assumes no responsibility for any 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 notice.

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:

ACN accessory list

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

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