Abstract: Devices to determine the filtration behavior of a device for filtering gaseous fluid. These devices are characterized by unchanged reproducibility during further tests. To this end, the device comprises a first device for setting a particular differential pressure, a second device having a certain degree of filtration efficiency of the gaseous fluid, which flows through the devices, of the filter test system such that a differential pressure and/or filtration efficiency are adjustable in a variable fashion and independently of one another, and the first device (2) and the second device (3) are normal for filtration, with permanently constant characteristics with regard to the differential pressure that is set and the filtration efficiency that is set as a reference device for simulation of a filtering separator, a first adapter for coupling on the inflow side, and a second adapter for coupling on the outflow side.

Abstract: An aerosol generator specially designed for the generation of monodisperse aerosols such as calibration aerosols for the testing of measuring equipment and filters; for aerosols for making streams visible or for inhalation aerosols for medical purposes. An aerosol generator, based upon the Sinclair La Mer-principle, has been modified by inserting a nuclei removing section combined with a valve bypass between the nuclei source and the saturator.