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Scanning Mobility Particle Sizer

Scanning Mobility Particle Sizer (SMPS) is an analytical instrument that measures the size and number concentration of aerosol particles with diameters from 2.5 nm to 1000 nm. It employs a continuous, fast-scanning technique to provide high-resolution measurements.

We offer scanning mobility particle sizers with condensation particle counters (SMPS+C) and with Faraday cup electrometers (SMPS+E) as detectors. All nanoparticle sizer systems feature the "Vienna-type" DMA design1, which is known for its highest size resolution and lowest particle diffusion losses. Thanks to the flexible design of the DMAs with three electrodes of different lengths (S-M-L), a wide range of experimental requirements can be met.



SMPS+C

The GRIMM SMPS+C systems feature the Vienna-type DMA design, well known for the highest size resolution and lowest particle diffusional losses – even for the smallest particles. GRIMM offers a flexible design of the Vienna-type DMA with two electrodes of different lengths to accommodate a variety of experimental needs. To expand the size range, the GRIMM SMPS+C can be combined with a GRIMM Optical Particle Counter to build a Wide Range Aerosol Spectrometer (WRAS) that measures size distributions up to the particle size of 32µm. It comes in two models - 5416-based and 5420-based.




SMPS+E

The GRIMM SMPS+E systems feature the Vienna-type DMA design, well known for the highest size resolution and lowest particle diffusional losses – even for the smallest particles – with a Faraday Cup Electrometer (FCE) as a detector. The SMPS+E systems include the GRIMM 5706 DMA controller and the GRIMM 5705 fast and low noise FCE. GRIMM’s unique FCE design applies a rinsing air flow around the insulator of the Faraday Cup to minimize the effects of leakage currents due to internal particle contaminations. The instrument is optimized to reduce the effects of mechanical shocks and pressure differences, enabling the SMPS+E as a reference instrument for the calibration of nano particle counters.



PSMPS

The PSMPS is a mobility particle size spectrometer that combines a Grimm SMPS+C system with the Airmodus Particle Size Magnifier (PSM). This combination allows accessing the 1 nm particle size range. It is indispensable for understanding the basic mechanisms of the highly dynamic processes of particle formation and the growth rate of the particles (e. g. Kulmala et al., 2013, Direct Observations of Atmospheric Aerosol Nucleation. Science, 339, 934).

Particle nucleation processes are important in the atmosphere where they affect the formation of clouds and the radiative forcing but also in combustion-related studies (e. g. the emissions of vehicle engines) and in material sciences (e. g. the synthesis of nanoparticles).