Weigh belt feeder for granular materials

Logo de la marque Hasler

The material passing through the feeder hopper of the belt feeder is extracted from the storage silo by the belt and then conveyed to the weighing bridge. The flow rate of the Gravit is calculated according to the speed of the belt and the load measured when it reaches the weigh bridge. The Gravit flow rate is maintained constant by the SCM electronic controller by regulation of the belt speed according to the set point requested. The belt feeder can also be used as a continuous weigher to measure a product flow and calculate total past weight (flowmeter function). Options can be added to the Gravit, including the addition of a chain collector (One or more transverse squeegees driven by two side chains retrieve the spilled particles from the bottom of the feeder and bring them back to the common outlet).

Customer benefits

  • Accuracy : ± 0,25%
  • Modular length and belt width
  • Easy maintenance and commissioning
  • Proven longevity and modularity
  • Permanent technical enhancement


  • Modular construction
  • Adapted and smooth surfaces
  • High rigidity thanks to folded side girders
  • Automatic belt tension device by spring-loaded tensioning roller
  • Auto-centring belt system
  • Turn-down ratio : 1:10 ; 1:20 ; 1:100


Spillage conveyor :

One ore more scraper(s) driven by two chains recover the particles that escaped from the weighfeeder and convey it to the common discharge point.


Hammer Gate :

This gate limits the height of the extraction section while enabling the passage of oversized material lumps, the mobile elements (hammers) lifting then returning to their original position once the material lumps have gone through.

Scraper - sticky materials:

this scraper keeps the belt clean when transporting sticky materials

Integrated into the new GRAVIT or under renovation, this scraper keeps the belt clean when transporting sticky materials. Maintenance is facilitated by its hoodopening mechanism from the outside.
The taring is thus maintained, preserving the dosing accuracy

Other options :

  • Inlets : Vibrating / elongated / rock-box
  • Rod closing gates / cut-off gates
  • Vanne à tringles
  • Material cover
  • High temperature resistant belt
  • Digital load cell


Weighfeeder signals and information, such as Weight, Speed, Belt tracking, Belt index are directly connected to the SCM-3 controller. The SCM controller calculates the actual flowrate, totalizes the conveyed material and generates the control signal for the variable speed drive.
Detailed alarm informations are obtained via the display (SDU).

* SCM-3 Field or Panel version: see : SCM-3-F-260.001-E. or SCM-3-P.260.001-E

Mobile application

The SCM-3 is supplied with a Process Display Unit offering a 5-inch touch screen and 16.7 million colors.
As an option a mobile application is proposed.

Dimensions and flowrates

TypeBelt widthIEA minB minHC minDFGWeight
Max flowrate
γ =1 t/m³
GRAVIT 650650C+700400*120070022913508501140~135066540
GRAVIT 800800C+700500*120070022913508501290~155077590
GRAVIT 10001000C+900600*1500110042917509001530~1800940170
GRAVIT 12001200C+900800*15001500429215010001730~20301140250
GRAVIT 14001400C+900100016001500429215011001930~22301300350

Dimensions en mm

* : Length can be doubled in order to increase the extraction surface
** : Maximum speed for very free flowing materials.


Technical data

Protection classIP55
Rating0,37 - 7,5 kw
Gear unitHollow shaft helical bevel gear
TransmissionDirect on head drum
Working temperature range-10°C to +60°C
Speed sensorDigital encoder
Girders and coverSteel
Conveyor beltRubber: endless vulcanized
Corrosion protectionPrimer, Finish coat
Color & CoatingRAL 5000 blue, 80μ standard

Download technical sheet