Generation of test particles of approx. 10 nm – 10 µm for filter testing, inhalation studies, calibration of measuring equipment, etc.

All airborne particles, e.g. droplets, dust, pollen, etc., within the size range of approx. 1 nm –100 µm are called aerosols. Defined test aerosols made up of droplets are required in order to enable a clear comparison of the performance of filters and particle measurement devices, for example.

Palas® aerosol generators and liquid nebulisers are in highly successful use worldwide due to their special advantages, including high dosing constancy, easy handling, long lifetime, and reliable, economical, and reproducible operation. All Palas® aerosol generators meet the stringent requirements of VDI guideline 3491.

In order to be able to perform practical analyses and comparisons, droplet aerosols must be generated from liquids that are also used in the real world. Fluids, such as water, DEHS, motor oils, white oil, etc., differ significantly in viscosity, surface tension, and density.

As a result, Palas® offers aerosol generators for liquids based on various atomization methods for different applications.

Test aerosols are able to be generated within a particle size range of approx. 10 nm – 10 µm and with mass flows ranging from a few mg/h to more than 300 g/h. Monodisperse or polydisperse test aerosol particle size distributions are able to be generated, depending on the model and aerosol substance.

AGF SYSTEM                                        

The AGF series features a robust design, easy handling, and a long lifetime. The AGF series comprises a combination of a binary nozzle with downstream cyclone. The AGF 2.0 is equipped with a cyclone with a cut-off diameter of dCut-off = 2 µm; the AGF 10.0 is equipped with a cyclone with a cut-off diameter of dCut-off = 10 µm.

The maximum particle concentration of the AGF series is approx. 107 particles/cm3. The cyclone is able to calculate the max. particle size, regardless of the liquid.

Large droplets generate high mass flows and may contaminate filters, for example, to such an extent that droplet loading causes the filters to be evaluated as better than they actually are during filter testing.

The AGF series is very successfully used for the generation of test aerosols, in clean room technology applications, to test compressed air filters, and for LDV measurements.

MAG SYSTEM                                      

MAG system provides particular advantages to the user. As a result, the MAG 3000 outperforms conventional Sinclair-LaMer generators.

• The bypass technology around the core source developed by Palas® enables larger particles to be generated within approx. 10 seconds.
• No no drying stage needed and only one volume flow meter is necessary with this new technology.
• Mechanical separation between the power supply and the particle generation system guarantees the greatest possible safety.
Among other uses, the MAG 3000 monodisperse aerosol generator is used to calibrate the resolution capacity and classification accuracy of measuring devices.

PLG SYSTEM                                        

In order to be able to perform practical analyses and comparisons, droplet aerosols must be generated from liquids that are also used in the real world. Fluids, such as water, DEHS, motor oils, white oil, etc., differ significantly in viscosity, surface tension, and density.

The PLG system uses a a nozzle system specially developed by Palas® based on the Laskin principle, which guarantees highly constant particle size distributions and particle concentrations over long periods.

Various model versions have been developed for different applications. Depending on the model, the liquid can be heated to temperatures of up to 120°C and atomized with various nozzles to different maximum mass flows of up to approx. 3 mg/h – 300 g/h. The nozzle can also be used at positive pressure values of up to 10 bar.

RAS SYSTEM                                        

The necessary reference concentration can be adjusted reliably and reproducibly to Cn,Ref = 106 particles/ft3 = 35.3 • 106 particles/m3 for the generation of the reference source flow QRef = 6.3 • 109 particles/min as per SWKI 99-3 and DIN 1946-4.

The RAS comprises an aerosol generator and an aerosol distributor with six aerosol outlets and up to six sampling heads. The highly accurate aerosol concentration is obtained by means of a special aerosol generator and one mass flow controller each for the volume flow on the aerosol generator and for the mixed air supply.

UGF SYSTEM                                       

Unlike the AGF series, UGF 2000 has a cyclone with built-in control air. The aerosol concentration is able to be varied by a factor of 500 using the control air introduced into the cyclone.High-efficiency particulate air filters (with quality H10-U17) are tested in accordance with international conventions with an aerosol whose particle count is mainly within the so-called MPPS (Most Penetration Particle Size, dp = 0.1 – 0.3 µm) range. The UGF 2000 provides this particle size spectrum exactly and the desired concentration.Large droplets generate high mass flows and may contaminate these filters to such an extent that droplet loading causes the filters to be evaluated as better than they actually are during filter testing.Exact isokinetic sampling is not necessary when sampling particles < 2 µm. This is why the UGF 2000 system has been successfully used worldwide for HEPA/ULPA filter testing for over 25 years.