Parameter Controlled Dilution Systems

An aerosol can change due to the dilution and sampling used in the system. Applications under high pressure or high temperature, like in combustion processes, will produce aerosols sensitive to pressure and/or temperature. To reduce the influence the measurement process has on the aerosol, the entire measurement chain has to be configured to provide isobaric and isothermal conditions. The KHG series of dilution systems can be heated up to 200°C for isothermal dilutions and can also be pressure-resistant up to 10 bar overpressure for isobaric dilution. When using the KHG series in combination with the heatable and/or pressure-resistant Welas® or Promo®, aerosol spectrometers, a completely isobaric and isothermal measurement chain is ensured.

The PMPD dilution system is used for aerosol characterization of emissions from internal combustion engines, including continuous combustion cycles. The Particle Measurement Program (PMP) is a mass measuring method in line with standardizing the particle measurement technique for internal combustion exhaust gases. The PMPD dilution system was specifically developed for the PMP application or the PMP measurement chain. The PMPD dilution system consists of a vaporization line and dilution line heated to 200°C and a thermodiluter to remove volatile particles. The efficiency of removing volatile particles was determined to be 0.99967. This was attained in Switzerland at the METAS Institute by means of a thermodiluter up to 200°C with 30 nm sized tetracontane (C40H82) droplets in accordance with "VPR Calibration Procedure AEA / ED47382 / Issue 5″ (Volatile Particle Removal Efficiency).

  • 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 of 1,000, 10,000 and 100,000
  • 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 and isothermal dilution up to 200°C
  • Dilution of hot aerosols, for example engine oil, DEHS, etc.
  • Aerosol measurement technology: Diesel exhaust gases, abrasive dusts, cooling lubricant aerosols, welding fumes, 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 oil mist separators
  • Hot gas filtration
  • Measurement of isolators under pressure conditions
  • Inhalation Toxicology, for instance the testing of medical nebulizers / inhalation studies
  • Dilution of hot aerosols such as engine oil, DEHS, etc.
  • Aerosol measurement technology: diesel exhaust gases, swarfs, coolant aerosols, weld smoke, oil droplets, test aerosols of filters and inertial separators
  • Dilution system for the PMP measurement chain
  • KHG 10
  • KHG 10 D (heatable and pressure-resistant up to 10 bar for isothermal and isobaric dilution with a dilution factor of 1:10)
  • PMPD 100
  • PMPD 1000


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