Flow measurement for bulk solids using weight and velocity


  • No moving components
  • Independent from changing product properties and flow velocity
  • Gentle product flow, passive measurement principle
  • Minimum operating costs
  • Free product flow also if device is switched off
  • Easy to integrate

What do you want to do?


SolidFlow 2.0 is a sensor especially developed for measuring the flow rate of solids conveyed in metallic ducts.

It has successfully been tested for online-measuring of:

  • all types of dust, powder and granulates
  • grain size between 1 nm and 1 cm
  • pneumatically conveyed materials or
  • in free fall after mechanical conveying systems
  • SolidFlow is wear-resistant and the commissioning is very easy.


The SolidFlow 2.0-sensor uses the latest microwave technology.
The sensor is used exclusively in metal piping.

The measuring field is generated through the special coupling of the microwave together with the metal pipe.
The microwave coupled into the pipe is reflected by the solid particles and received by the sensor.

The received signals are evaluated with regard to their frequency and amplitude.

The sensor virtually works like a particle counter that counts streaming particles per time unit.

The frequency-selective analysis ensures that only streaming particles are measured.
The SolidFlow 2.0 has a active roping compensation. Based on latest microprocessor-technology, the measuring signal is being dismantled in its frequency spectrum, which enables the sensor to compensate influences of roping.
The calibration of the sensor takes place in the installed state, simply by pushing a button and entering the reference quantity.

Mounting and Installation

For the assembly of the sensor, the installation location is specified in accordance with the conveyed inlet and outlet paths.

In case of pipe diameters over 200 mm, 2 or 3 sensors per measuring point are used, with the sensors arranged at 90° or 120° to each other.

In free-fall applications (e. g. after conveyor screws or rotary conveyors), an inlet path (fall height) of at least 300 mm is ideal. Shorter inlet paths are possible by agreement.

The sensor bracket (welding socket) is welded on at the specified installation location. After this, a 20 mm-borehole is drilled through the sensor bracket and through the pipe wall.

The sensor is then adjusted to the wall thickness, inserted and fixed with the help of the coupling nut. Done!


The commissioning of the measuring device takes place via the FME analysis electronics.

These electronics offer a convenient, menu-driven input of parameters such as measuring range, desired physical units or measuring signal attenuation.

The available outputs are a current output, 4…20 mA as well as a pulse output (open collector). The menu language options are German, English or French.

Technical Data
Sensor Housing Stainless steel 1.4571
Protection category IP 65, DustEx 20 or GasEx (option)
Operating temperature Front end of sensor: – 20 … + 80 °C [-4 … +176 °F]Optional: – 20 … + 200 °C [-4 … +392 °F]Sensor electronic: 0 … 60 °C [+32 … +140 °F]
Max. working pressure 1 bar, optional 10 bar
Working frequency K-Band 24,125 GHz (± 100 MHz)
Transmitting power Max. 5 mW
Weight 1.3 kg
Dimension Ø 60, Ø 20, L 271 mm
Accuracy ± 2… 5 % in calibrated range
Transmitter Power supply 110/230 V, 50 Hz (optional 24 V DC)
Power consumption 20 W / 24 VA
Current consumption Max. 1 A at 24 V
Protection category IP 65 according to EN 60 529/10.91
Operating temperature -10 … + 45 °C [+14 … +113 °F]
Enclosure dimensions 258 x 237 x 174 (W x H x D)
Weight Approx. 2.5 kg
Interface RS 485 / RS 232 C (ModBus)
Cable glands 3 x M16 (4.5 – 10 mm Ø)
Screw terminals 0.2 – 2.5 mm² [AWG 24 – 14]
Current output signal 4… 20 mA (0… 20 mA), load < 500 Ω
Measurement value alarm relay output Relay with switching contact, max. 250 V AC, 1 A
Data storage Flash
Pulse output Open Collector – Max. 30 V, 20 mA
C-Box Size 98 x 64 x 35 mm (W x H x D)

Application Examples

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

Flow metering of hearth furnace coke
in a waste incineration plant for the bonding of pollutants

Flow metering of quicklime in free fall
Flow metering of maize meal in free fall

Volume determination of activated coal
for the bonding of pollutants in a waste-to-energy plant

Spice dosing in the manufacture
of potato chips

Continuous throughput measuring
of pulverised limestone in pneumatic conveyors

Flow metering of baking powder in free fall
Continuous volume measurement in free fall for the filling of salts
Flow metering of grains in free fall

Global Technology Systems

P.O. Box 799 Shalimar, FL 32579. USA
(850) 651-3388
[email protected]


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