Handheld Emission Particle Counter

Particle measurement in diesel exhaust gases

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Researchers at the FHNW have developed a portable device for checking Diesel particle filters based on the naneos Partector 2.
This device, called HEPaC, will be available in the third quarter of 2022. It is METAS-certified for the Swiss market.


The 7 key benefits of the HEPaC are:

 Simple measurement of particle number concentrations
 Portable and battery-operated
 Emission measurements without dilution (sensor heated)
 Concentration range up to 5'000'000 particles/cm3
 No operating fluids or dryers necessary
 Automatic creation of an official measurement report on a tablet
 METAS-certified according to ordinance SR 941.242

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  • Measured value: Particle number concentration
  • Intended vehicle types: Diesel vehicles only. No gasoline or CNG vehicles.
  • Concentration range: 103-5·106 pt/cm3
  • Time resolution: 1s
  • Response time: 5s
  • Inlet flow: 0.5 l/min
  • Evaporation tube temperature: 195°C
  • Sensor temperature: 55°C
  • Heat up time: ~20min
  • Relative humidity: 10 % to 90%, non-condensing
  • Environmental operating temperature: 5 – 40°C
  • Environmental pressure range: 860 – 1060 hPa
  • Battery: Rechargeable Li-Ion, 48Wh
  • Battery runtime: ~3h (with a new battery)
  • BT wireless range: 3 - 30 m, depending on obstacles
  • Noise: < 60dB
  • Mechanical environment: M2
  • Electromagnetic environment: E2
  • Dimensions: 37.5 x 9.2 x 4.4 cm
  • Weight: 1.1 kg

Exhaust gas contains a lot of humidity, which can condense in the measuring device when the gas cools down. This could lead to problems with the measurement. Therefore, corresponding sensors are heated or the gas gets previously diluted. Exhaust gases from petrol and natural gas vehicles, however, contain a lot more humidity, which is why the device should only be used for diesel exhaust gases.

Scope of delivery

  • Sensor
  • Probe
  • Transport case
  • Power supply
  • Manual
  • Software package for tablet operation