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D-FL 220 measuring devices side by side

D-FL 220
Volume flow measuring system

For continuous, contactless volume flow measurement in dry and humid gases. Reliable, even under demanding operating conditions.  


Functionality: Ultrasonic transit time difference method

  • Continuous measurement of velocity and volume flow
  • Contactless measurement 
  • Corrosion-resistant ultrasonic transducers
  • Measurement over the entire duct diameter
  • Automatic control functions
  • Certified for official emission monitoring
  • Precise measurement of gas velocity and volume flow
  • Suitable for measurement in humid and aggressive gases
  • Long life time and high availability even under extreme plant conditions
  • Low maintenance
  • Continuous emission monitoring in humid and aggressive gases
  • Continuous emission measurement in small to very large duct diameters
  • Volume flow measurement for process control and process optimization
  • Technical data
  • System components
Measuring principleUltrasonic transit time difference method, in-situ measurement, continuous measurement, double-sided installation, contactless measurement
Measuring variableVolume flow (operation), volume flow (standardized), velocity, temperature
Measuring rangeVelocity: 0 … 40 m/sVolume flow: 0 … 5,000,000 m3/h
Certified measuring range0 … 30 m/s
Ambient conditionsAmbient temperature:-40 … +70 °C (measuring device)-40 … +60 °C (certified)Humidity: 30 … 60% relative humidity, non-condensing
Operating conditions in ductTemperature: max. 300 °CRelative humidity: 0 … 95%, non-condensingRelative pressure: -50 … +20 hPa
Duct dimensionsInner diameter: 0.5 … 14 m, depending on the operating conditions in the ductWall thickness: max. 800 mm
InterfacesAnalogue output: 1x 4 … 20 mA, maximum 400 Ohm, potential-freeDigital output: 2x NC/NO, max. 60 VDC, 30 VAC, 0,5 AModbus RS 485 RTU, USB
Operation and displaySoftware D-ESI 100, operating unit D-ISC 100, status LED
Control functionsAutomatic zero point and reference point measurement
Nominal voltage24 VDC
Degree of protectionIP65
2 measuring devices D-FL 220
Purge air unit D-BL
Terminal Box D-TB 100
Software D-ESI 100* or
Operating unit D-ISC 100**
Weather protection (optional for outdoor installation)

* Enables remote access via web interface, PC with Windows operating system required

** Additional interfaces with D-ISC 100 operating unit

  • Mandatory
  • Recommended
D-TB 100
D-ESI 100
D-ISC 100 xx2