- Flow Metering Instruments



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

  • Reliableflow meteringin pneumaticdense-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)


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.


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.


  • Housing: Steel St 52, powder-coated (optional Stainless steel 1.471 DN10 - 125 mm (larger diameters on request) Flange EN 1092-1
  • Inner pipe: Ceramic
  • Protection category: IP65
  • Ambient temperature: Sensor electronic: 0 - +60°C
  • Medium temperature: Sensor pipe: 0 - +80°C (higher temperatures as option)
  • Working pressure: Max 16 bar, optional 25 bar
  • Working frequency: 88 kHz
  • Weight: Depending on the nominal diameter
  • Velocity range: 1 - 10 m/s
  • Dimensions: Ø DN + 150mm, L 500mm
  • Accuracy: ± 2 - 5% in calibrated range


  • Power Supply: 110/240V AC, 50 Hz, 24V DC
  • Power consumption: 20W/24VA
  • Protection category: IP65 to EN 60 529/10.91
  • Operating temperature: -10 - +45°C (14 - 113°F)
  • Dimensions: 258 x 237 x 174mm (W x H x D)
  • Weight: Approx 2.5 kg
  • Cable glands: 3 x M16 (4.5 - 10mm Ø)
  • Terminal clamp wire size: 0.2 - 2.5mm² (AWG 24 - 14)
  • Current output signal: 2 x 4 - 20 mA (0 - 20 mA) load < 500 ^
  • Alarm output: Relay with toggle switch - max
  • Error output: 250V AC, 1A
  • Data backup: Flash memory
  • Impulse output: Open collector - max 30V, 20 mA
  • RS 485 interface : ModBus

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