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DDU 570 – Diffusion Dryer

The Topas Diffusion Dryer DDU 570 has been developed mainly as additional equipment for the Aerosol Generator ATM 220 that is operated by compressed air. The aerosol to be dried is streaming through 3 screen pipes which are surrounded by Silica Gel (desiccant with indicator) serving as drying agent. The Silica Gel causes a very dry atmosphere. The excess moisture in the aerosol moves into the dry environment by the effect of diffusion. Because the aerosol does not get into direct contact with the drying agent only a very low particle loss occurs.

  • Only minimal particle loss, because the desiccant and the aerosol are not in direct contact
  • Uncomplicated, but effective working principle (diffusion drying)
  • Desiccant by means of an exsikkator easy to regenerate
  • Drying of aqueous aerosols
  • In connection with Aerosol Generator ATM 220: Generation of calibration aerosols with aqueous suspensions of reference particles
  • In connection with an atomizer: used for nuclei source of the Condensation Aerosol Generators SLG 250 / 270

The diffusion dryer was developed for applications under ambient air pressure condition. It is not suitable for pressure conditions.

Physical Data of the Silica Gel *)
Bulk densityapprox. 800 kg/m³
Granular sizeGranules / 2 – 5 mm
Loss on drying (150°C, 3 h)max. 2%
Water adsorbing capacitymin. 25%
Colour changefrom orange to colourless
Melting Point>1000 °C
Flash PointNot applicable
Substances to be avoidedstrong oxidizing agent
*) contains heavy metal free moisture indicator

Versions of diffusion dryer
DDU 570/HDDU 570/L
Adapted for:ATM 230ATM 220 / ATM 226
Dimensions in mm (Ø x height)70 mm x 475 mm70 mm x 253 mm
Mass of drying agentapprox. 830 gapprox. 410 g
Max. volume flow10 l/min5 l/min
max. pressure counter100 mbar
max. ambient temperature40 °C
max. aerosol temperature40 °C
Hose connector8 mm
Weight (without silica gel)0.94 kg0.72 kg

Product Brochure

User Manual