Dynamic Dilution System DDS 560 for variable-adjustable dilution of aerosols at variable air flow rates
Made in Germany. brand TOPAS, model DDS 560
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The Dynamic Dilution System DDS 560 is designed to definitely and reproducibly dilute aerosols according to EN ISO 14644 part 3 with possibility to adjust the dilution factor.
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.
The operating principle is based on the splitting of the total volume flow into a so-called bypass volume flow and a capillary volume flow. By means of an HEPA-filter all the particles are removed from the substantially larger bypass volume stream. The particle concentration of the smaller capillary volume stream remains unchanged. These two flows are eventually brought together again. The dilution factor is determined by the ratio of the capillary volume flow to the total volume flow. Both volume flow rates are continuously measured. The volume flow ratio is calculated and shown on the display. The total flow rate of the DDS 560 is set by the inlet volume flow of the particle counter. The user can adjust the desired dilution ratio with a control valve in the bypass line.
BENEFITS
APPLICATIONS
| Parameter title | Unit | Value |
|---|---|---|
| purpose of conditioning | – | dilution of aerosols |
| sample condition, outlet | – | diluted aerosol |
| setting parameter | – | dilution factor |
| setting range | – | 5 … 370 (depending on aerosol flow rate, see product sheer) |
| setting resolution | – | 1 |
| setting method | – | manual |
| aerosol, volumetric flow rate | L/min | 0,5 … 3,0 (continously variable) |
| sample condition, inlet | – | non-diluted aerosol |
| power supply | – | 12 V DC, 300 mA (via power adapter) |
| hose connector | mm | Ø 8 |
| material, capillary | – | brass |
| environmental condition, max. counterpressure | kPa | ± 35 |
| dimensions (w × h × d) | mm | 300 × 200 × 140 |
| weight | kg | 2,9 |
ACCESSORIES
You can request the necessary certificates, documentation, instructions and user manuals for TOPAS DDS 560 using the special form.
You can buy TOPAS DDS 560 in UK or Europe at a favourable price in «DOLCHETRADE» by leaving a request on the website, by phone +441225535040 or by email dolce@dolcetrade.com. TOPAS DDS 560 price are subject to change depending on exchange rates. We deliver instruments by transport companies in the United Kingdom and Europe.
See also: Aerosol Diluters for clean room
