Volume flow measurement

Depending on the composition of the exhaust gas, temperature, stack diameter, and pressure conditions, etc., different measurement methods are used to determine volumetric flow and exhaust gas velocity in industrial exhaust gases: the impact pressure method or ultrasonic technology. Almost every kind of situation can be handled with the devices presented here.


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

Differential pressure


Flue gas volume flow, flue gas velocity

Typical measuring ranges for CEM

0 ... 3 000 000 m3/h
2 ... 50 m/s


  • Measurement of flue gas velocity

  • Calculation of volume flow at standard conditions

  • Adjustable parameters

  • Automatic back-purging device (optional)

  • Versions with or without counter-support and for point measurement

  • Probes: 0.4 - 2 m/up to 4 m/up to 8 m

  • Options: Display and control unit, weather protection cover, special design in other materials, dP transducer in ex-version