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.