The Engine Exhaust Particle Sizer™(EEPS™) spectrometer Model 3090 measures the size distribution of engine exhaust particle emissions from 5.6 to 560 nm with the fastest time resolution available (10 Hz). 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).



TSI’s EEPS spectrometer uses an array of sensitive electrometers, combined with three proprietary data inversion matrices, to provide real-time particle size data in 32 size channels (16 channels per decade). The data inversion matrices allow the researcher to optimize size distribution accuracy for specific particle types (soot, default and compact), and matrices can be applied at the time of measurement or in a post-processing environment. The EEPS spectrometer does not include any built-in sample dilution, giving the user maximum flexibility and independence with respect to sample conditioning. However, for measuring solid particles from engines, TSI now offers the Porous Tube Thermodiluter (PTT) 3098, a fully integrated sample conditioning solution for the EEPS spectrometer.

The EEPS spectrometer operates at ambient pressure to prevent evaporation of volatile and semi-volatile particles; consumables or an external vacuum pump are not required. Providing size distributions and number concentrations (ranging down to 1000 #/cm3) ten times a second, the EEPS spectrometer has been proven to be a valuable tool for automotive emissions engineers and aerosol researchers.


  • Engine exhaust particle characterization
  • Aftertreatment particle filter performance analysis
  • Brake dust emission studies
  • Fundamental aerosol research


  • Wide size range and dynamic concentration range
  • Real-time measurements with 10Hz frequency
  • Selectable particle matrices
  • Robust design and operation
  • Service made simple
  • Front panel display
  • Flexible data management with EEPS software
  • Proven measurement principle

Brošure i tehničke specifikacije

Particle Instruments Catalog US

Engine Exhaust Particle Sizer Spectrometer Model 3090 Spec Sheet A4