Cascaded Dilution Systems

The Palas VKL series of dilution systems operate according to the ejector principle and form the basis for VDI guideline 3491 sheet 15. The VKL series of dilution systems are unique in their ability to provide a particularly long service life and easy operation. They deliver a constant and representative dilution with factors of 10, 27, or 100. By cascading several VKL systems it is possible achieve a dilution factor of up to 1 : 1,000,000. The VKL dilution systems are used in vertical operation for powders or dusts with particles up to 20 µm making them ideal for clean room applications.

The VKL systems can be combined with all common particle counters. The VKL systems can be fabricated from stainless steel for corrosive aerosols and/or configured so that they are pressure-resistant to 10 bar overpressure. The VKL 27 dilution systems were developed specifically for the application of testing gas masks, where the dilution factor of 1 : 27 is required.

The DC 10000 utilizes a fan for the air supply in the dilution cascade eliminating the need for compressed air. The DC 10000 can be used for the dilution of aerosols with a particle size up to 5 µm and can also be operated with external compressed air, if available. The DC systems are typically used in the filter media test rigs that operate according to EN 1822 and ISO 29463. The dilution cascade has an aerosol inlet and four aerosol outlets to which aerosol measuring devices, such as optical particle counters, according to ISO12501-4, or optical aerosol spectrometers can be connected. Depending on which aerosol outlet is connected to the relevant measuring system, the defined dilution factors of 1:10; 1:100; 1:1,000 or 1:10,000 can be achieved.

VKL 100


DC 10000

  • Each individual dilution system is characterized unambiguously and each is documented with a calibration certificate
  • The dilution steps deliver a constant, representative dilution with the factors 10 or 100
  • The dilution systems can be cascaded with the factors 1,000, 10,000, 100,000, and 1,000,000
  • Low compressed air consumption at 128 l/min with a dilution factor of 10,000 by utilizing four VKL 10 systems
  • The dilution steps can be combined with all common particle counters
  • Can be tested for performance by the users themselves with a simple test set-up
  • Provides isobaric dilution up to 10 bar overpressure with the VKL 10 ED dilution system
  • Aerosol measurement technology: diesel exhaust gases, coolant aerosols, welding smoke, oil droplets, test aerosols of filters and inertial separators
  • Separation efficiency can be determined with the use of counting measuring methods, for instance the separation efficiency of dust filters or HEPA/ULPA filters
  • Leak test and acceptance measurements of clean rooms, isolators, and safety work benches
  • Inhalation Toxicology
  • Quality control of respirator masks and filter cartridges
  • Aerosol dilutions in filter test systems like the MFP 1000 HEPA and MFP Nano plus
  • Aerosol dilution in clean rooms
  • Aerosol dilution in the operating room to determine the level of protection according to 93-3 and VDI 1946-4
  • VKL 10
  • VKL 10 E (Made of stainless steel for corrosive aerosols)
  • VKL 10 ED (Pressure-resistant dilution system made of stainless steel for dilution at up to 10 bar counter-pressure, and for corrosive aerosols)
  • VKL 10 V (Has a suction volume flow of 50 l/min and was developed to combine the dilution system with clean room counters)
  • VKL 100
  • VKL 27 (Developed specifically for the application of testing gas masks)
  • DC 10000


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