DIL 551 Static Dilution System
Manual static 1:10 aerosol dilution system for 28.3 L/min flow, providing reproducible particle-concentration reduction while retaining the aerosol size distribution.
Model Overview
| Model | Configuration | Primary use | Selection note |
|---|---|---|---|
| DIL 551 | 1:10; 28.3 L/min | Manual static 1:10 aerosol dilution system for 28 | Select DIL 551 for manual 1:10 dilution at 28.3 L/min. |
Key Features
Defined and reproducible dilution
Reduces aerosol particle concentration by a specified ratio while retaining the particle-size distribution of the sampled aerosol.
Capillary and HEPA-bypass principle
A small capillary flow retains the original particle concentration while particles are removed from the larger bypass flow before both streams are recombined.
Stable operation
Designed to provide a consistent dilution ratio during changing operating conditions in cleanroom, filter-test and aerosol-measurement workflows.
No auxiliary compressed-air supply
The passive flow arrangement uses the downstream instrument or process flow, avoiding a separate dilution-air supply for normal operation.
Overpressure and underpressure capability
Suitable for integration in measurement lines that operate under positive or negative pressure within the specified counterpressure limits.
Low-maintenance construction
Uses a compact fluidic layout with a HEPA-filtered bypass and requires only routine inspection and service of the flow path and filter elements.
Technical Specifications
| Parameter | Unit | Value / Description |
|---|---|---|
| CONDITIONING | ||
| Purpose | — | Dilution of aerosols |
| Sample condition, inlet | — | Non-diluted aerosol |
| Sample condition, outlet | — | Diluted aerosol |
| Dilution factor | — | 10 |
| Aerosol volumetric flow rate | L/min | 28.3 |
| Setting method | — | Manual |
| CONNECTIONS & OPERATING CONDITIONS | ||
| Power supply | — | 12 V DC, 30 mA |
| Hose connector | mm | Ø 8, optional Ø 10 |
| Pressure drop | kPa | 0.8–1.3 |
| Environmental temperature | °C | 10–50 |
| Maximum counterpressure | kPa | ±35 |
| PHYSICAL | ||
| Dimensions (W × H × D) | mm | 110 × 160 × 300 |
| Weight | kg | 1.5 |
Specifications follow the current Topas GmbH product information reviewed for this page. Confirm the final configuration, accessories and calibration documentation at quotation stage.
Applications
Verification of cleanroom test aerosols
Reduces high upstream challenge-aerosol concentrations to a range suitable for optical particle counters during cleanroom and clean-air-device testing.
Laminar-flow and safety-cabinet acceptance
Supports acceptance measurements on laminar-flow boxes, work benches, safety cabinets and smaller cleanroom installations.
Filter separation-efficiency measurement
Extends the usable concentration range of particle counters in upstream and downstream filter-efficiency measurements.
Highly concentrated aerosol analysis
Conditions concentrated aerosol samples before particle counting to reduce coincidence-related measurement errors.
Aerosol research
Provides a defined dilution stage for experimental aerosol generation, transport and particle-size-distribution studies.
Measurement-range extension
Allows particle-measurement instruments to analyse aerosol concentrations that would otherwise exceed their operating range.
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