Scanning Mobility Particle Sizer

SMPS | TSI with Ultrafine Condensation Particle Counter 3776

Location: LFG, Haberstraße 9a, 91058 Erlangen, Room 01.813

The SMPS is suitable for measuring the particle size distribution of gas-borne nanoparticles (< 1 m) and consists of two units: the Electrostatic Classifier (TSI Model 3080) with Differential Mobility Analyzer (DMA) and Kr-85 Neutralizer (TSI Model 3077) and the Condensation Particle Counter (TSI Model 3776).

The size range is primarily determined by the DMA used. The nano DMA (TSI Model 3085) is suitable for particle sizes between 5 nm and 120 nm, while the long DMA (TSI Model 3081) can measure sizes between 15 nm and 670 nm. The size range can be fine-tuned using measurement parameters.

According to the manufacturer, the CPC can measure concentrations up to 3105 particles/cm³ and has two operating modes (“high-flow”/”low-flow”). The high-flow mode is suitable for smaller particles as the aerosol is drawn in at a higher volume flow, reducing diffusion losses. In low-flow mode, the size measurement range is wider.

In addition to the SMPS, another electrostatic classifier (TSI Model 3082) with an additional nano DMA can be used for tandem DMA measurements. With a tandem DMA setup, particle size change processes can be studied using 2-dimensional particle sizes.