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.