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MaxxFlow HTC - Fall through measurement of high mass flow rates

For measurement of high mass flow rates for dry solids from the exit of pre feeding devices, e. g. screw conveyors, air slides, rotary valves, bucket elevators, etc.

  • Most non-metallic solids can be measured
  • Can be installed on round pipes or ducts
  • No real upper limit of mass flow
  • Maximum pressure 10 bar
  • Dust tight
  • No flow restrictions to the process flow (wear resistant ceramic liner)
  • The mass flow measurement is independent of flow characteristics
  • Maximum temperature, 12O °C
  • Can be installed at an angle
  • Small footprint, 220 mm (DN 100), 290 mm (DN 150), 310 mm (DN 200)
  • No moving parts, hence no maintenance
  • Easy to calibrate


The MaxxFlow HTC is specially developed for the flow measurement of dry bulk solids during high-volume throughput. Due to its completely open profile and its low installation height, the MaxxFlow HTC is especially suitable in situation in which it was previously only possible to use complicated or expensive mechanical solutions, e. g. impact plates or measuring chutes.

The installation of the MaxxFlow HTC takes place independently of the direction of the line (vertical/inclined), but always after mechanical conveyor elements,
e. g. rotary feeder, screw conveyors, air slides or chain conveyors.


After the conveyor, the material to be measured falls or slides through an inlet path and runs through the sensor. During the throughput, the MaxxFlow HTC records the material type and speed. Since the material falls from a constant height after emerging from the conveyor element, the speed of the product stream is accelerated, but is constant at the installation position of the sensor.
Due to this constant speed, the speed measurement does not need to be activated in every case, but can be calculated as a constant depending on the height of the fall. The mass flow is determined as follows:

Q (kg/s)   =   K (kg/m3)   x   v (m/s)   x   A (m2)

Through the input coupling of a high-frequency, electro-magnetic alternating field, a homogenous measuring field is generated in the measuring tube.
The measuring tube (interior tube of the sensor) consists of wear-resistant Al2O3 ceramics. Dry bulk solids inside the measuring field reduce the amplitude of the alternating field.
This leads to a measuring signal that is in proportion to the concentration of the dry bulk solids in the sensor (kg/m3).

If the material speed varies, for example due to a change in initial speed, then this can also be measured. 
This takes place through a runtime measurement with the help of two additional electrodes behind the interior ceramics tube.

Mounting and Installation

A complete measuring station consists of these components:

•    Measuring feeder for installation in the conveyor line
•    Transmitter

The measuring feeder is available in sizes DN 100, DN 150 mm and DN 200 mm.
On request the components inlet path (between conveyor element and sensor) and gate valve (for calibration) can also be configured and supplied.

The transmitter is connected to the sensor using 4-wired, shielded cable.
The maximum distance between measuring feeder and transmitter is 300 m.

Technical Data

Application examples

Mass flow measurement of raw meal
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Mass flow measurement of potato starch in free fall prefeeding chain conveyors
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Mass flow measurement of salt in free fall pre feeding chain conveyor
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Mass flow measurement of wood pellets in free fall
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Flow metering of grains
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Mass flow measurement in building material industry
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Mass flow measurement of raw meal after dosing roller
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Quicklime mass flow measurement in free fall after an air slide
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Mass flow measurement EPS granules in pipe after disc conveyor
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