EPNC Diffusion-Charging Based Particle Number Counting Technology as Alternative to Condensation Particle Counting Based Methods

Elmeri Laakkonen, Markus Nikka, Peter Lambaerts, Anssi Arffman, Panu Karjalainen, Philipp Seifert, Peter Schwanzer

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Particle Number (PN) measurement testing has for long been conducted by using Condensation Particle Counter (CPC) based technology. While accurate at low concentrations, CPC has nevertheless several drawbacks for in-field use, such as the use of a working fluid, the need for dilution, the delicate optical components and the sensitivity to contamination. Diffusion Charging (DC) based particle counting technologies have often been disregarded as a valid alternative to CPC based methods due to their intrinsic particle size dependent counting efficiency and lower sensitivity. However, Dekati's novel ePNC PN technology has brought DC technology to the next level. Due to its patented technology, the Dekati ePNC's particle counting efficiency is nearly size independent, turning DC as a competing technology for CPC, especially for demanding field applications, such as Periodic Technical Inspection (PTI), Portable Emission Measurement Systems (PEMS) for Real Driving Emissions (RDE), and brake and tire wear measurements. These applications require the ability to continuously measure elevated particle concentrations with sufficient accuracy in often harsh environments such as garages or during on-road testing. In this study we will look closer into the ePNC technology and show the results of recent measurement campaigns that prove the suitability of the Dekati ePNC's DC technology as an alternative to CPC methods. For example, during vehicle type approval style chassis dynamometer measurement ePNC technology was found to produce comparable results against a PMP reference (7% difference in emission factor).

Original languageEnglish
Title of host publicationSAE Technical Papers
PublisherSAE International
Publication statusPublished - 16 Jan 2024
Publication typeA4 Article in conference proceedings
EventSymposium on International Automotive Technology - Pune, India
Duration: 23 Jan 202425 Jan 2024
Conference number: 18

Publication series

NameSAE Technical Papers
PublisherSAE International
ISSN (Print)0148-7191


ConferenceSymposium on International Automotive Technology
Abbreviated titleSIAT 2024
Internet address

Publication forum classification

  • Publication forum level 1

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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