A new Electromobility Spectrometer for the Measurement of aerosol distributions in the Sizerange from 1 to 1000nm

The electromobility Spectrometer is an automated measurement system for the size analysis if fine and ultrafine aerosols using Differential Mobility Analysers (DMA) for the classification of particles and an elestrical sensor for their detection. To cover a particle sizerange from 1 to 1000nm, new DMAs with different geometries  have been designed to optimize performance for small and large particles. Key problems in the characterization of partices smaller than 20nm have been adressed. A Farady Cup electrometer woth a sensitivity of 10^-16 A is used as a particle sensor to avoid the deficieny of condensation nucleus counters with counting efficiencies decreasing with particle size...