Solid Flow Meter for Dense Phase

DensFlow is a measuring system especially developed for the continuous flow measurement for dense phased-conveyed materials and high flow rates.

DensFlow is used for the online-measuring of:

  • types of powder or granulates
  • pneumatically dense phase-conveyed materials
  • after mechanical conveying systems, e.g. chutes, slides or pipes
  • with large flow rates


  • Reliable flow metering in pneumatic dense-stream
  • Unlimited throughput volumes can be measured
  • optionally pressure-resistant up to 25 bar
  • Installation creates no obstacle in the profile, hence no dead spots in which residue can form
  • Measurement independent of the flow speed of the material
  • Simple retrofitting
  • Maintenance-free
  • Contactless measuring procedure
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Application Examples

  • Continuous Flow monitoring of PCI Coal Dust

    Continuous Flow monitoring of PCI Coal Dust

  • Flow metering of coal dust in dense stream in a steel plant

    Flow metering of coal dust in dense stream in a steel plant

  • Technical Specifications
  • Applications
  • Operating Principle
  • Literature
  • Sensor diameter: 20mm to 125mm
  • Ambient temperature: Sensor electronic: -20 … +60 °C
  • Mediums temperature: Sensor pipe: -20 … +80 °C
  • Max. working pressure: 16 bar, optional 25 bar
  • Working frequency: 100 kHz
  • Accuracy: ± 2…5 % in calibrated range
  • Housing: Stainless Steel
  • Inner Pipe: Ceramic
  • Fuel Conveying
  • Coal Dust Injection Conveying in Dense phase
  • Mechanical Conveying

Through the special input coupling of a high-frequency, electromagnetic alternating field, a homogenous measuring field is generated in the measuring pipe. Solids within this measuring field reduce the amplitude of this alternating field. This leads to a measuring signal corresponding to the concentration of the solids being conveyed in the measuring tube (kg/m3). 
Using the same kind of sensor, the change of the alternating field is measured within the measuring tube at two additional points. These two sensors have a defined distance to each other. 
The analysis electronics with its integrated correlator determines the runtime of the conveyor belt between the both sensors from the two sensor signals. The known distance is then used to determine the speed of the solid (m/sec). 
The two measured parameters concentration (K) and speed (v) as well as the known profile (A) of the measuring tube, the flow is determined as
Q = K x v x A 
and output as a 4 ... 20 mA signal.