Palas GmbH

- Model VKL 10 - Aerosol Dilution Systems

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The welas VKL 10 series of dilution systems can reduce the concentration of aerosols by the dilution factor 01:10, also of very highly concentrated aerosols, in a defined and reliable way. The Palas VKL 10 dilution systems are used in vertical operation for the particle size range up to 20 µm for powders and dusts. Dilution factors of up to 1:100,000 are achieved by cascading several VKL systems.

Particle-free air with the volume flow VR circulates through an annular passage around the suction nozzle. Thus, according to Bernoulli, a volume flow VAn is generated at the suction nozzle.

The dilution factor VF is calculated according to the following formula

Representative dilution of particle size distribution of the Palas dilution systems by cascading

VDI report no. 1973 from 2007 proved metrologically that a reproducible aerosol dilution is possible with the Palas dilution systems down to VF 100,000.

  • The dilution systems from Palas  are characterized unambiguously. This is documented with a calibration certificate for each individual device.
  • The dilution steps deliver a temporally constant, representative dilution with the factors 10 and 100.
  • The dilution systems can be cascaded with the factors 100, 1,000, 10,000 and 100,000
  • Low compressed air consumption , e.g. just 128 l/min with a dilution factor of 10,000 with four VKL 10 systems
  • The dilution steps are combinable with all common particle counters.
  • With a simple test set-up these cascaded dilution systems can be checked by the users themselves.
  • Isobaric dilution up to 10 bar overpressure / isothermal dilution up to 120°C with the VKL 10 E, VKL 10 ED, KHG 10 and KHG 10 D dilution systems

Simple functional test on-site

With this simple test set-up, the Palas cascaded dilution systems can be checked by anyone themselves:

Firstly a particle measurement is performed with one dilution step. Here it is important that the aerosol concentration, e.g. lab air, to be measured does not exceed the coincidence limit (maximum detectable aerosol concentration). In the second step, the dilution step to be tested is connected in series (cascaded). To check the dilution factor of the test step (pos. 2), the total particle count form the measurement in pos. 1 is divided by the total particle count from pos. 2.

Provided the first measurement is not affected by a coincidence error and the dilution system under test is working (not soiled), a dilution factor of almost 10 is determined. If this should not be the case, there was possibly coincidence in measurement 1. In this case the aerosol concentration has to be decreased or a further dilution step used. Another possibility would be that the dilution step to be tested is soiled. In this case the device has to be cleaned and the test repeated.

  • Aerosol measurement technology: diesel exhaust gases, swarfs, coolant aerosols, weld smoke, oil droplets, test aerosols of filters and inertial separators
  • Separation efficiency determination with counting measuring methods, e.g. with 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

  • dimensions: 100 • 245 • 100 mm
  • weight: about 4.0 kg
  • dilution factor: 1 : 10
  • isokinetic suction nozzles: 0.045 l/min, 0.3 l/min, 3.5 l/min, 9 l/min, 28 l/min, 50 l/min
  • maximum particle size: < 20 µm (for dusts)
  • special features: cascadable
  • volume flow (clean air): 18 - 45 l/min
  • volume flow (suction flow): 2 - 5 l/min
  • compressed air supply: 4 - 8 barg

  • Suction nozzles
  • absolute filter
  • adapter for special nozzles
  • compressed air adapter for series VKL
  • compressed air distributor
  • transportation case for up to 2 VKL-systems
  • tube connections
  • tubes

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