Dust and opacity measurement devices

Dust removal systems are standard equipment at cement plants, among others. Electric or fabric filters are made use of to comply with legally stipulated dust limits in exhaust gases. The optical dust and opacity measurement devices presented here ensure compliance with the limits and also monitor the effectiveness and functionality of filter systems.


D-R 200 is a system for in-situ monitoring of dust emissions on smaller plants and in process applications. The system uses the double pass light attenuation principle. The system consists of a measuring head, a reflector, a purge air supply unit and a zero point reflector.

Our service staff is available at all times for the safe and smooth operation that follows: on-site service, helpdesk, remote maintenance and diagnostics as well as training in training centers or at your location. We also offer fast, reliable, world-wide supply of spare parts.


Measuring principle



Opacity, extinction

Typical measuring ranges for CEM

0 ... 25/50/100 % OP
0 ... 0.2/0.4 ... 1.6 Ext
0 ... 160 mg/m3
0 ... 4 000 mg/m3 dust (with reference to 1 m path length after gravimetric calibration)


  • In-situ measuring principle directly in flue gas flow

  • Digital operation with microprocessor

  • Adjustable limit value

  • Two contact switch outputs

  • Measuring value integral 4/15/64 seconds

  • Internal event memory

  • PC-interface for easy maintenance

  • Results shown as opacity or extinction

  • No weather protection covers needed