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Fluidized Bed Aerosol Generator 3400A

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Useful for a variety of applications, the Fluidized Bed Aerosol Generator Model 3400A aerosolizes dry powders and dusts. Using bronze beads to break up powder agglomerates, the FBAG 3400A generates a constant output in terms of aerosol concentration and size distribution. It is used in various applications such as filter testing, inhalation toxicology testing, and providing seed particles for laser-velocimetry.

Product Details

The FBAG* Model 3400A is a general-purpose powder disperser. As air forces its way up through the horizontal screen and around the bronze beads and dust particles it creates a boiling action that de-agglomerates the powder. The FBAG disperses powders over a size range from 0.5 to 40 µm, in concentrations from 10 to 100 mg/m 3 . A key feature of this aerosol generator is its stable output and concentration.

*Developed in cooperation with the University of Minnesota Particle Technology Laboratory.

Features and Benefits

  • Particle size range from 0.5 to 40 µm
  • Bed of bronze beads breaks up powder agglomerates
  • Stable output and concentration


  • Inhalation toxicology
  • Filter testing
  • Particle seeding
  • Powder dispersion

  • Do I need to change the bronze beads every time I change powders (Model 3400A)?
    Yes. Once the bronze beads are used they are contaminated by the powder. Used beads should be saved for reuse when the same powder will be aerosolized again.
  • How long does it take for the output concentration to stabilize (Model 3400A)?
    With fresh bronze beads it may take seven or eight hours for the output concentration to fully stabilize. Until this time the concentration will constantly increase. If the beads have been previously allowed to stabilize with the same powder then a constant output will occur within a couple of minutes. Also, if the feed rate of the powder is changed it will take several hours for the generator to restabilize.
  • Why am I not getting any particles larger than 3 or 4 µm coming out of the Fluidized Bed (Model 3400A)?
    There is a cyclone at the outlet of the Fluidized Bed the cuts out all particles larger than 3.5 µm. The cyclone comes installed from the factory, but may be easily removed.

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