Dilution System DDS 560

The dynamic dilution system DDS 560 serves for customised and reproducible dilution of aerosols with variable dilution factor and for any flow rate in the range of (0.5 - 3.0) L/min.

Standards

The adjusted dilution factor is shown on a display. In the applied principle that corresponds to the standard VDI 3491-15, particles are removed from the sample according to the specified dilution ratio – the particle size distribution remains unchanged.

Optical particle counters show a maximum measurable aerosol concentration due to their operating principle. If this limit is exceeded major errors cannot be excluded, for example because of coincidence. In case of clean room testing or laminar flow box testing according to VDI 2083 measurements of high upstream concentrations are required. Conventional clean room particle counters are unable to measure at such high concentrations.

By placing the dynamic dilutor DDS 560 before a particle measuring device, e.g. the LAP 322: Laser Aerosol Particle Size Spectrometer, the aerosol concentration can be reduced by a factor selected by the user. Thus, the required upstream concentration can be diluted to a concentration which is within the measuring range of the particle counting device.

Benefits

• infinitely variable dilution of aerosols
• infinitely variable sample flow
• monitoring and visualisation of sample flow and dilution ratio
• characteristics of the gas phase of the aerosol (e.g. humidity) are maintained
• self-contained system (i.e., no external air supply necessary, no exhaust air flow)

Applications

• validation and test of clean room equipment
• checking HEPA- and ULPA-filters
• filter media verification
• aerosol research
• verification of aerosol generators and powder disperser

Accessories

• set of straight adapter R3 and elbow adapter R4 for aerosol outlet
• replacement HEPA-Filter capsule