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Electrical mobility has become an established metric for measuring ultrafine particle size and particle size distributions are often assumed to denote mobility diameter. The building block of early electrical mobility instruments was the Differential Mobility Analyzer, which allows the selection of particles of a given (variable) electrical mobility, when coupled with a suitable charging device (neutralizer). The DMS500 combines electrical mobility measurements of particles with sensitive electrometer detectors, allowing generation of particle size/ number distributions in real-time. These outputs may be further processed to give simultaneous outputs of particle size, number and mass. The instrument is ideally suited to a range of applications from ambient and process monitoring to direct measurements of high concentration sources such as engines.
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- Download DMS500 brochure
- Download 'Time Response vs Data Rate'
- Download 'Ambient aerosol sampling with DMS500'
- Download 'Measurement of Drug Delivery Inhalers'
- Download 'Empirical calibration procedure'
- Download 'Measurement of Volatile Aerosols with the dms500'
- Download 'DMS500 sizing, resolution & time response'
- Download 'Nanoparticle emissions from a domestic multi-fuel stove'
- Download 'Nanoparticle emissions from cooking'
- Download 'DMS500 Reproducibility and Accuracy'
DMS500 offers measurement of the particle size distribution from 5nm to up to 2.5μm.
(Allowing measurement of PM2.5.)
Measurement of the aerosol size spectrum from 5nm to 2.5μm for both solid particles and liquid droplets
The fastest time response available: 10 Hz data, 200ms T10-90% response
Optional integrated two stage dilution for high concentration measurements, including engine exhaust
Real time log-normal mode fitting and recalculation of derived parameters- e.g. surface area, mass
Remote control via RS232 or Ethernet
Special patented features of the differential mobility classifier give this particle sizer the fastest time response available in any ultrafine aerosol sizer. The fast T10-90% time response is especially useful for investigation of fast changing spectra. Even during steady state conditions, the DMS500 dramatically increases the efficiency and convenience of experimental measurements compared with scanning instruments.
Uses a high sample flow rate (8 litres per minute) and unique multiple sheath flows in the charger, resulting in low diffusion losses even of small particles.
Each DMS500 undergoes an empirical calibration procedure, involving real aerosols, taking full account of particle losses, and even different particle morphologies thus preventing the drop in accuracy at larger sizes seen in some other analyzers. Calibration certificates for spherical and agglomerate calibrations are provided.
An optional portable size check kit allows the user to check the sizing accuracy of the DMS500 on site, without the need for any other equipment.
The DMS500 is controlled by a Windows PC via an Ethernet interface, allowing the PC to be located up to 200 m from the instrument. The user interface includes datalogging of the spectrum, including real-time aerosol mode information. The DMS500 is designed to easily integrate with other test equipment- four analogue inputs are recorded to the data file, and four analogue outputs may be configured in software. The instrument can be controlled via digital remote control and can even trigger other equipment at a pre-set aerosol concentration (for example a roadside camera). Data presentation tools for MS Excel are included to assist in understanding the data from the DMS500.