Measurement of the aerosol size spectrum from 5nm to 2.5μm
The fastest time response available: 10 spectra/second, 200ms T10-90
Built-in two stage dilution for direct engine exhaust measurements
Mass measurement and automatic aerosol mode discrimination
The Cambustion DMS500 offers measurement of the particle size distribution from 5nm to up to 2.5μm. Special patented features of the differential mobility classifier give this particle sizer the fastest time response available in any ultrafine aerosol measurement.
The time response is especially useful for investigation of fast changing spectra such as combustion engine emissions, drug delivery systems such as inhalers, and roadside ambient aerosol sampling. But it also dramatically increases the efficiency and convenience of experimental measurements compared with scanning instruments.
The DMS500 is fully controlled by a computer up to 200 m from the instrument. The interface includes datalogging of the spectrum and up to four auxiliary analogue signals for correlation with other measurements. Four analogue outputs can be configured to reflect the particle concentration in any desired size range. For integration with other test equipment, the instrument can be controlled by a digital remote control and it can even trigger other equipment at a preset aerosol concentration (for example a roadside camera). Data analysis tools are included to ease postprocessing in Microsoft Excel.
Flexible sampling options
Due to its sub-ambient operation, the DMS500 is very tolerant of sample pressure: the facility to run the entire sample line at reduced pressure also allows preservation of high frequency information without particle loss problems. The instrument includes an integrated two-stage diluter allowing measurements from engine exhausts with no additional equipment as well as reducing cleaning requirements. Additional sampling options such as a heated line are available.
The combination of the particle size and the time resolution of the DMS500 allows investigation of previously unmeasurable events. For example the data on the left shows short lived normal combustion, visible smoke, and nucleation mode aerosols, produced during and after a heavy acceleration from a Diesel vehicle.
To allow unattended operation in applications such as ambient monitoring, the DMS500 includes the facility for sampling at preset times and periodic automatic zeroing. For optimum sensitivity, the interface offers automatic averaging of the spectrum over periods up to a minute.
Mass Measurement and Mode Finding
The DMS500 automatically discriminates principle aerosol modes. When applied to Diesel exhaust, this allows the Nucleation (volatile) and Accumulation (soot) modes to be treated separately, thus enabling PMP comparable number concentration measurements without the use of a thermal diluter. The instrument also calculates real-time particulate mass concentration, which can be combined with an air flow signal provided to one of the instrument's analogue inputs to give a total mass signal as an analogue output or logged to file. For more details of this feature, please download this information sheet.
To see more DMS500 applications click here.
Contact Cambustion for more information and prices.