Model VMF-90A™ Volumetric Screw Feeder

Model VMF-90A Volumetric Screw Feeder


  • Automatic metering screw feed system for mixing and dispensing dry powdered or pelletized material into a secondary process
  • Ideal for water, wastewater and chemical processing applications
  • Heavy-duty, gear-driven auger for metering mechanism
  • Built-in hopper capacity of 1.5 cu. ft.
  • Feed rate 0.07 to 10.19 cu. ft. per hour
  • Accuracy of within 1.0% of volume
  • Optional gravimetric feeding with integrated “Loss in Weight” system

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Scaletron 2 Year Warranty on All Feeder Products

Automatic Metering Screw Feed System for Mixing and Dispensing Dry Powders into a Secondary Process

The Model VMF-90A Volumetric Screw Feeder has been designed to be a “stand alone” option for adding a simple volumetric feeding unit to any process. The VMF-90A is capable of accurately dispensing many common chemicals found in the water and waste water industries, as well as, a host of other industrial chemicals. The VMF-90A is the perfect choice for a basic feeder while still incorporating a few standard industry upgrades like a concentric material conditioning auger, SCR motor controller and a vibratory agitator mount.

Standard Features

  • Rugged, corrosion resistant 304 stainless steel frame
  • Built-in 1.5 cu. ft. gravity fed hopper in 304 stainless steel with maintenance access hatch and integrated load cell attachment point
  • 0.50″, 0.75″ or 1.5″ Diameter solid auger in 304 stainless steel with “bayonet” style connection
  • Standard concentric material conditioning overwind auger
  • Water and dust proof NEMA 4X, variable speed motor controller capable of remote installation
  • 90 VDC right-angle geared, wash down motor


  • Integrated “Loss in Weight” measurement system with four (4) load cells and AccuPro 5000 Digital Controller
  • 316 Stainless steel or dry powder epoxy coated carbon steel construction
  • 316 Stainless steel augers and overwind helix augers
  • Hopper extensions for additional capacity
  • Lift-off, hinged, clamp-on and adapter lids
  • 50 lb. and bulk bag loaders
  • SCADA programmable and HMI PLC touch screen motor controllers
  • Explosion proof motors
  • Mixing tanks, wetting cones and eductors
  • Vibratory agitators and particle crushers
  • Dust collectors
  • Feeder stands and elevated loading platforms
  • Programmable controller module stand


Feeder and scale are designed to accurately dispense:

  • Aluminum sulfate (alum), calcium hydroxide (hydrated lime), carbon, ferric and ferrous sulfate, magnesium hydroxide, polymers, potassium, soda ash, sodium sulfite and thiosulfate, and other dry powders or pelletized materials