Particle filtration research


Dekati® measurement solutions for particle filtration efficiency (PFE) research and testing include both real-time instruments and gravimetric cascade impactors for particle size distribution and concentration measurements. Our particle measurement solutions have been successfully used in filter efficiency testing and research for over 25 years and today, our instruments are used globally by thousands of customers both in research and industry to measure different properties of airborne particles <10 µm.

Dekati® measurement instruments provide more detailed information than what filtration standards (EN 149, EN 13274, EN 14683) require. Our measurement solutions provide options for real-time monitoring of particulate mass, number, or the lung-deposited surface area (LDSA) of the particles, and for total concentration and particle size distribution measurements. Our instruments additionally enable gravimetric and chemical analysis of size classified particles with cascade impactors, PM10 – 2.5 – 1.0 measurements and real-time particle size distribution measurements. The instruments operate in a wide dynamic range enabling the use of the same instrument for measurements before and the filter.

Dekati® instruments are used for testing and research of

  • Air cleaning filters
  • Facemasks including N95, N99, N100, FFP1, FFP2 and FFP3 masks
  • Electret filters
  • Ventilation filters (HVAC testing)
  • Oil mist filters
  • Blow-by gas filters in automotive industry
  • Baghouse filters and ESPs in energy production and other stationary sources
  • Other industrial filters

Particle Filtration Research and Testing

Assessing facemasks to protect against COVID-19 using ELPI®+ at Instituto Nacional de Técnica Aeroespacial (INTA), Spain. Image courtesy of Victor Achilla (

Filter efficiency measurements with Dekati® Products

  • Real-time particle size distribution measurements 6 nm-10 µm with one measurement method and one instrument
  • Up to 500 size classes for detailed analyses of filtration efficiency
  • Wide dynamic range – same instrument for pre- and after filter measurements
  • Long term measurements with minimal down time
  • Options for particle mass, particle number, and lung-deposited surface area (LDSA) measurements
  • Options for measuring particle charge levels in different size fractions
  • Options for real-time or gravimetric size distribution measurements with cascade impactors
  • Additional options for chemical or biological analysis of the size classified particles