Wide Range Gravimetric Particle Size Distribution

Dekati® Low Pressure Impactor DLPI+ is a widely used and well characterized cascade impactor for detailed particle size distribution analysis. This impactor gives information on particle size distribution in 14 size fractions 16 nm - 10 µm. The size classified particles can be collected on different material substrates, such as aluminium or polycarbonate, for either gravimetric or chemical analysis. The High Temperature DLPI+ allows sampling from up to 180 °C making it an ideal choice for stationary source emission measurements and other applications where particle sample is at high temperature.

Each individual DLPI+ impactor unit is calibrated for exact flow rate and impactor stage cut points to ensure accuracy of the measured data. The DLPI+ desgin is the same as in the ELPI®+ (Electrical Low Pressure Impactor) enabling an easy upgrade from DLPI+ into a full ELPI®+ system for real-time particle size distribution measurements.

The measurement setup in emission measurements includes:

  • High Temperature DLPI+
  • Vacuum pump, no additional flow control needed
  • Isokinetic sampling probes for different flow velocities
  • Dekati® Cyclone for removal of 10 µm particles (optional)
  • Needed connections which may vary depending on the dimensions of the measurement location


DLPI+ features include:

  • Wide particle size range; 16 nm – 10 μm
  • Particle size distribution in 14 size fractions
  • 10 lpm sample flow rate, Classic DLPI available for 30 lpm
  • Integrated impactor low pressure measurement and adjustment
  • Gravimetric, chemical or SEM/TEM analysis of size classified particles
  • Stainless steel stages for operation even in harsh environments
  • Sampling from up to 180 °C with High Temperature DLPI+
  • Excellent calibration data*
  • Can be upgraded into a full ELPI®+ system for real-time data
  • Complete measurement setups including cyclones, isokinetic sampling probes, heaters and pumps available from Dekati Ltd.

* Järvinen, A., Aitomaa, M., Rostedt, A., Keskinen, J. & Yli-Ojanperä, J. 2014. Calibration of the new electrical low pressure impactor (ELPI+). 2014. J. Aerosol Sci. 69, pp. 150-159.