Gravit Light

Weight belt feeder for alternative fuels

Logo de la marque Hasler

HASLER Group Gravit light is suitable for the dosing of alternative fuels and low density materials, like shredded plastics, household waste, biomass fluff, wood, chips or sawdust. Equiped with a specific belt scape, Gravit Light receive the same accuracy than the other weigh belt feeders, special attention has been given to the design in the aim to adapt it to the light-density materials. According to our customers, this is a uccess !


  • Cement
  • Power plants

Customer benefits

  • Accuracy : ±0,5%
  • Easy maintenance and commissioning
  • Longevity
  • Permanent technical enhancement
  • Suitable for shreded plastics, household waste, biomass fluff, wood, chips or sawdust with a max. density of 300 kg/m³


  • Modular construction
  • Mild steel frame
  • Closed material guiding channel
  • Inlet weighing for controlling a pre-feeder
  • Light material belt
  • Max. capacity 350 m³/h
  • Low maintenance
  • Nonsensitive to foreign material
  • Turn-down ratio : 1:40
  • ATEX Version available on request

Specialities and options


Belt scraper : Special belt scraper made of PE-UHMW for smooth cleaning of the belt.

Silicon skirting :
Sealing between material guiding channel and belt is made by silicon skirts.


Spillage conveyor :
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.

Feed screw


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.

The pre-feeder is controlled as a function of the inlet weighing.

Detailed alarm informations are obtained via the display (SDU).

Flow controllers for SCM-3 conveyor belts

* SCM3 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.


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Technical data

Protection classIP55
Ratingfrom 0.55 kW
Gear unitHollow shaft helical-bevel or helical-worm gear
TransmissionDirect on head drum
Working temperature range-10°C to +60°C
Speed sensorDigital encoder
Girders and idlersMild steel
Materialguide and -coverMild steel (Stainless steel on request)
BeltPVC or rubber, endless vulcanized
Corrosion protectionPrimer, Finish coat
Colour & CoatingRAL 5000 blue, 80μ standard

Download technical sheet