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EAN 581 – Electrostatic Aerosol Neutralizer

The Bipolar Electrostatic Aerosol Neutraliser EAN 581 from Topas conditions the charge distribution on test dusts as well as other aerosols, like required in ISO 11155-1 and DIN 71460-1. Charge equilibrium can be controlled by mixing positive and negative ions in a precise manner.

The mechanical interaction of particles, especially solid ones, may cause undesirable levels of electrostatic charge. Test dusts must be generated with a high degree of reproducibility for instance when evaluating aerosol separation techniques such as cyclones, filters or impactors. Comparable results can only be obtained at controlled and similar charge levels.


The aerosol discharge of Electrostatic Aerosol Neutralizer EAN 581 is based on the corona discharge principle and consists of a mixing chamber with two separate ionization heads and a control unit. Positive and negative ions are generated by the two ion blowers and consecutively mixed into the aerosol stream in the mixing chamber. A source of compressed, particle free air is connected to both of the ionization heads and mains voltage applied to the power cord.

The special design of the mixing chamber guarantees nearly ideal mixing conditions allowing the highest (dis)charging efficiency. The exchange of air ions onto the surface of the particles causes changes in the final charge remaining on the particle as it leaves the unit.

  • Controllable generation of ions
  • Separate adjustment of both positive and negative ion sources
  • No radioactive source
  • Easy to integrate into existing filter test systems and other test apparatus


  • Effective, controllable aerosol neutralization
  • Neutralisation of charged test dusts produced with dust generators (like Dust Disperser SAG 410)
  • Particle charging in a definite manner
  • Reproducible evalutation of aerosol separation techniques and filtration efficiencies (e.g. part of Filter Test Stand for Cabin Air Filters PAF 111 and ALF 114 – Test Stand for Air Filters acc. to EN 779)
  • Quality assurance
  • Fundamental aerosol research
EAN 581 - Electrostatic Aerosol Neutralizer
Aerosol Flow Rate1…15m³/h (17..250lpm)
AerosolsSolid or liquid aerosols 0.1 … 150 µm
Connections Inlet OutletOuter diameter 8 mm 14 mm
Pressurised Air SupplyParticle filtered air, max. 8bar
Power ConsumptionApprox. 50 W
High Voltage0 … 10 KV
Ionization Current0 … 150 µA
Power Supply100 … 260 VAC
Dimensions Control Unit480 mm x 260 mm x 160 mm
Weight Control Unit Mixing Chamber7.5 kg 1.2 kg

Product Brochure

User Manual