DensFlow - Material flow metering in dense-stream

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DensFlow -
Flow metering in dense-stream

The measuring system for continuous flow metering in dense-stream conveying
and high levels of throughput

  • 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 (no mechanics)



What do you want to do?


DensFlow is a measuring system specially developed for flow metering of solids in dense-stream conveying. DensFlow is used  in the  online measurement of:

- Powders or granules

- in pneumatic dense-stream transport


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.

Mounting and Installation

In pneumatic dense-stream conveying , the installation point is specified in accordance with the conveyed inlet and outlet paths.
The assembly of the measuring tube at the specified installation point takes place using a flange installation. Measuring tubes can be supplied in standard form in nominal widths of up to 150 mm with flange connections in accordance with DIN 2576.

Technical Data

Sensor Housing Stainless Steel 1.4571, NW 10 ... 125 mm, flange EN 1092-1  
  Inner pipe Ceramic  
  Protection category IP 65 according EN 60 529/10.91  
  Environment temperature Sensor pipe electronic:
0 ... + 60 °C
Sensor pipe:
- 20 ... + 80 °C (higher temperatures as option)
  Max. working pressure 16 bar, optional 25 bar  
  Working frequency 100 kHz  
  Weight Depending on the nominal diameter  
  Velocity range 1 ... 10 m/s  
  Accuracy ± 2 ... 5 % in the calibrated range range  
  Dimension NW + 90 mm, L 500 mm  
Transmitter Power supply 110 / 240 V, 50 Hz, 24 V DC  
  Power consumption 20 W / 24 VA  
  Protection category IP 65 to EN 60 529 / 10.91  
  Operating temperature - 10... + 45 °C [14 ... 113 °F]  
  Dimensions 258 x 237 x 174 (W x H x D)  
  Weight approx. 2.5 kg  
  Cable glands 3 x M 16 (4.5 - 10 mm Ø)  
  Terminal clamp wire size 0.2 - 2.5 mm² [AWG 24-14]  
  Current output signal 2 x 4 … 20 mA (0 … 20 mA), load < 500  
  Alarm output - Error output Relay with toggle switch - max. 250 V AC, 1 A  
  Data backup Flash memory  
  Impulse output Open Collector - max. 30 V, 20 mA  
  RS 485 interface ModBus  

Application Form

Application examples

Click on a desired application example to navigate to a detailed description.


Flow metering of coal dust
in dense streams in steel manufacture

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

Main lance monitoring
during coal injection in the steel plant

Single lance monitoring
in the steel plant during the firing of the oven


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