High Resolution ELPI®+


The Dekati® High Resolution ELPI®+ (Electrical Low Pressure Impactor, HR-ELPI®+) is an advanced version of the widely use ELPI®+ instrument. The High Resolution ELPI®+ combines features of the ELPI®+ with a data inversion algorithm that gives real-time particle number size distribution in up to 500 size classes 6 nm – 10 μm. Other High Resolution ELPI®+ features include wide particle sample concentration range, robust structure and possibility to characterize chemical composition of size classified particles after the real-time measurement. The wide measurement range, superior size resolution and fast time response make the High Resolution ELPI®+  and ideal tool for a broad range of particle measurement applications.



  • Wide particle size range 6 nm – 10 µm with one single instrument and one measurement method
  • Real-time particle number size distribution in up to 500 size classes
  • 1 Hz sampling rate
  • Possibility to collect size classified particles for chemical analysis
  • Wide operational concentration range
  • Simple and robust construction with stainless steel impactor stages
  • Insensitivity to variations in sample pressure
  • Several data saving options including analogue inputs and outputs
  • Can be used also in standard ELPI®+ mode to measure particle active surface, mass and charge size distribution



The robust structure of the HR-ELPI®+, and its ability to measure in real-time over a wide size range, make the HR-ELPI®+ the ideal choice for various measurement applications. In combination with Dekati® Sample Conditioning Instruments, Dekati can provide complete HR-ELPI®+ measurement solutions for a very broad range of applications and even demanding measurement conditions. Typical applications for the HR-ELPI®+ include:

  • Combustion process studies and emission measurements
  • Outdoor and indoor air quality measurements
  • Occupational health studies
  • Engine exhaust measurements
  • Brake wear measurements
  • Blow-by gas measurements
  • Nanoparticle measurements


Other ELPI®+ versions

High Temperature ELPI®+