Introduction to the DMS Series
The DMS500 was launched in 2002, as the first of a new type of instrument. It combines electrical mobility measurements of particles with sensitive electrometer detectors, to give ouputs of particle size, number and mass in real time.
Refreshed in 2009 as the MkII with significant upgrades in sensitivity and test cell integration, the DMS500 is ideally suited to laboratory or engine test cell applications.
The DMS50 builds on the DMS500 technology, offering similar features in a smaller package ideally matched to in-vehicle or mobile measurements.
DMS500 Features
- Measurement of the aerosol size spectrum from 5nm to 2.5μm
- The fastest time response available: 10 Hz data, 200ms T10-90% response
- Built-in two stage dilution for direct engine exhaust measurements
- Mass measurement and automatic aerosol mode discrimination
- Enhanced Sensitivity- DMS500 MkII now 3x more sensitive than DMS500 MkI
- Test cell integration via AK protocol
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 fast T10-90% time response is especially useful for investigation of fast changing spectra, with applications including engine emissions, drug delivery systems, tobacco smoke research, pyrotechnics and ambient aerosol sampling. Even during steady state conditions, the DMS500 dramatically increases the efficiency and convenience of experimental measurements compared with scanning instruments.
The DMS500 is controlled by a 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 preset aerosol concentration (for example a roadside camera). Data presentation tools for MS Excel are included to assist in understanding the data from the DMS500.
Sample handling & conditioning options
The DMS500 may be ordered with an optional integrated two-stage diluter and heated sample line, allowing measurements from engine exhausts with no additional equipment. The dilution system also extends instrument cleaning intervals, allowing the DMS500 to join other test cell equipment as standard tools. as well as reducing cleaning requirements.
The unique combination of the particle size range and the time reponse of the DMS500 allows investigation of previously unmeasurable events. The data on the left show 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 scheduled operation based either on fixed time intervals, or a more sophisticated text file containing a schedule. 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 between aerosol modes. When applied to Diesel or GDI exhaust, this allows the Nucleation (liquid) and Accumulation (solid) modes to be processed separately, enabling PMP (proposed Euro 5/6 particle number / km) comparable number concentration measurements without the use of a volatile particle remover. The instrument also calculates real-time particulate mass concentration. All instrument outputs may be compensated in real time for total exhaust mass flow, if a suitable external analogue signal for flow is available. 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.