Dust concentration

Devices used for the continuous dust measurement register in the wider sense the physical changes caused by the particles in the measuring system converting them into electrical signals. For that the measured object can be analysed directly in exhaust gas channel (in-situ measurement) or a partial volume flow is collected and fed into a measuring device (extractive sampling).

As result of the in-situ techniques, the measurement signals derive from the direct interaction of light or a triboelectric probe with the dust particles in the exhaust gas channel. For evaluation the scattered light or the absorbance of a transmitted light beam respectively triboelectricity can be used.

The in-situ measuring devices are only suitable for the measurement of dust in dry gases.

In case of wet or saturated with water vapour gases, the existing water droplets and aerosols create also light scattering effects, which distort the measurements results. Therefore in these cases the extractive measurement technique should be selected. The basis of the extractive methods constructs a preferably isokinetic partial flow extraction from the main gas flow. As measuring principles the scattered light measurement or the triboelectric measurement can be carried out. 

The process-related restrictions have substantial influence over the choice of the measurement method.

Periodic dust concentration measurements are usually used as a standard reference method (gravimetric) for calibration of continuous dust concentration measuring devices.



Dust concentration measuring device OPM 19 ED

  • extractive measurement in wet and sticky exhaust gases
  • optical scattered light measurement
  • measuring gas is sampled by a temperature regulated probe
  • measuring range: dust (in operation) 0...7.5 mg/m³ (max. 250 mg/m³)


Dust concentration measuring device PFM 20

  • suitability tested EN 15267; QAL1 and MCERTS certified
  • tribo-electric in-situ dust monitor certified by TUV according to EN 15859:2010
  • lowest certificated range 0 - 7.5 mg/m³ dust, max. measuring range 0...250 mg/m³ dust (special range 0...1,000 mg/m³ dust on request)
  • for installations requiring a permit (13th BImSchV, 17th BImSchV, 30th BImSchV, 44th BImSchV, TA Luft) as well as at installations according to the 27th BImSchV
  • automatic zero and reference point check


Mobile filter diagnosis device PFM 20 m

  • easy and safe handling of complete system thanks to portable case design
  • immediate evaluation of the clean gas dust content after filter systems 
  • flexible use by variable length of the probe rod
  • data transfer and software update via USB interface 
  • easy mounting


Dust concentration measuring device PFM 06 ED

  • extractive optic dust concentration measurement
  • measurement in wet, sticky exhaust gas conditions
  • optical dust sensor
  • suitability tested according to EN 15267-3 (QAL1)
  • approved for installations according to IED


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