Test rig MFP Nano plus for the determination of the separation efficiency of filter media according to EN 1822-3

摘要

The MFP Nano plus with the integrated U-SMPS system (measuring particles in the size range of 5 nm up to 1 μm) can test filter media with salt aerosols as well as with oil droplets, e.g. DEHS. By choosing the adequate solution concentration in the aerosol generator the mean generated particle size is precisely defined. Thus, the system can be matched to an optimum counting statistic for the particular MPPS range (Most Penetrating Particle Size). The polydisperse test aerosol is classified with the DEMC (Differential Electrical Mobility Classifier), so that only monodisperse particles of a particular size can get on the filter media for the determination of the efficiency. This procedure minimizes loading effects caused by the test aerosol on the filter medium at the downstream measurement. The condensation particle counter UF-CPC 50 then determines fast and reliably the appropriate particle number concentration to each particle size. The UF-CPC 50 uses a large optical measurement volume and is therefore optimized for highest counting rates in very low aerosol concentrations. This procedure minimizes loading effects caused by the test aerosol on the filter medium at the downstream measurement. The series MFP for the evaluation of the dust holding capacity, the pressure loss and the efficiency of filter media has been proven to the entire satisfaction of our customers for years. The entire spectrum in air filter media testing, starting at very low efficient open media up to ULPA qualities can be carried out with the different versions of the MFP series.