Measurement of ultrafine aerosol size distributions by a combination of diffusion screen separators and condensation particle counters

So far, on-line measurements of aerosol size distributions in the sub-µm regime were accomplished by a Condensation Particle Size Analyzer (CPSA) for the size range dP < 20 nm and a conventional DMA for the size range 10 – 1000 nm. The CPSA is a four channel instrument based on CPC-technique. It provides information in the size range from 3 to 20 nm with a time resolution in the order of seconds (Schröde