Engine Exhaust Particle Sizer Spectrometer 3090

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Product Details

The Engine Exhaust Particle Sizer 3090 (EEPS™) spectrometer measures the size distribution of engine-exhaust particle emissions in the range from 5.6 to 560 nm with the fastest time resolution available. Users can visualize and study the dynamic behavior of particle emissions that occur during transient test cycles, during the first few seconds of a cold start, or during regeneration of a particle trap or diesel particulate filter (DPF).

The EEPS spectrometer displays measurements in 32 channels total (16 channels per decade). It operates over a wide particle concentration range, including down to 200 particles/cm3. It operates at ambient pressure to prevent evaporation of volatile and semi-volatile particles, and it requires no consumables.

Ease of operation is a key feature of this particle sizer. All components are housed in a single 32-kg cabinet that includes the vacuum source. A microprocessor measures temperature and barometric pressure automatically to convert to volumetric flow. The instrument includes features for remote operation and includes software that is unmatched in the industry.

Developed under license from Airel, Ltd.

Features and Benefits

  • Measures particles from 5.6 to 560 nm
  • 10-Hz data collection captures transient events in real time
  • Comprehensive software for data collection and analysis
  • Easy to use
  • Housed in a single cabinet that weighs just 32 kg
  • Four configurable analog outputs (see Application Note EEPS-001) NEW
  • Selectable matrices tailored to application for more accurate measurement (See Application Note EEPS-005) NEW


  • Engine-exhaust particle sizing

Included Items

  • Engine Exhaust Particle Sizer software

To request more information about TSI's Engine Exhaust Particle Sizer (EEPS™) spectrometer, including a price quotation, a system demo, and/or product literature contact TSI today .

  • Can the Model 3090 measure exhaust directly from the tailpipe?
    No. Like most other instruments, the EEPS™ spectrometer requires dilution before the hot engine exhaust particles are sampled. Many of the size distribution characteristics are determined by how the conditioning and sampling are done.
  • Do I need to send the Model 3090 to TSI for recalibration?
    The EEPS™ spectrometer can be cleaned and serviced in the field. Periodic service and calibration at a TSI facility is recommended to ensure accurate sizing.
  • How do I know that particle size information is correct?
    TSI's years of experience with the earlier electrical mobility systems have resulted in this new instrument for measuring particle sizes. Comparing the results of a stable aerosol size between a Scanning Mobility Particle Sizer™ (SMPS) and the EEPS™ spectrometer will assure that the particle sizing is correct. If there is a significant difference, see the troubleshooting section in the EEPS manual to identify likely sources of the problem.
  • How do I know that the Model 3090 is working properly?
    Built-in diagnostics indicate when air flows and charger or column voltages are out of specification and prevent operation if the conditions are not correct. Periodically running particle size standards will also ensure the system is sizing particles properly. Refer to the appropriate sections of the Model 3090 EEPS™ spectrometer manual.
  • How do the Model 3090 results compare with other instruments that use different technology?
    The standard for sizing engine exhaust particles is the TSI SMPS™ systems. The Model 3090 EEPS™ spectrometer uses a similar electrical mobility technique but with multiple sensors to get a much faster size distribution.
  • How does the temperature and humidity affect the EEPS™ spectrometer measurement?
    Temperature and relative humidity affects the formation of nucleation mode particles. If the temperature is too high, the electrometer response can be affected. Dilution and control of the sample temperature is necessary for consistent results.
  • What if the density is unknown?
    As long as you are simply comparing results for consistency, a density value can be assumed. A constant density for all particle sizes can be easily entered into software. If the true density is determined later, or the assumption needs to be changed, the user can edit the density value at any time.
  • What if the density setting is incorrect?
    The density setting for each particle size can be set either before or after taking data. Tables of density settings (for different sizes) can be saved and loaded to quickly change density to that which controls the mass results.
  • What test protocols can be performed with the Model 3090?
    The instrument can do tests up to 90 minutes in length. If a test needs to be stopped early, a single mouse-click (or several key strokes) will stop data collection.

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