Model VMF-28 SL™ Volumetric Screw Feeder with Silo Connection

Model VMF-28 SL Volumetric Screw Feeder with Silo Connection


  • Automatic metering screw feeder for dispensing dry powdered or pelletized material into a secondary process
  • Ideal for water, wastewater and chemical processing applications
  • Designed for direct connection to silo
  • Heavy-duty, gear-driven auger for metering mechanism
  • Built-in hopper capacity of 5.0 cu. ft.
  • Feed rate 0.03 to 50.0 cu. ft. per hour
  • Accuracy of within 2% 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 Polymers into A Secondary Process

The Model VMF-28 SL Volumetric Screw Feeder with Silo Connection has been designed to be an “all in one” option for adding an in-line dry chemical addition process fed by silos. The VMF-28 BL 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 directly into a supply line. The VMF-28 SL is the perfect choice when you need to control the addition of medium to larger doses of dry chemicals to a process. To meet customer demands Scaletron has combined a rugged screw feeder, programmable control module, a number of standard upgrades, and a flexible iris or slide gate valve silo connector and then mounted it all to a rugged base. If you are looking to do a “one and done install” for a dry chemical feeding system, then Scaletron is sure the VMF-28 SL will meet and exceed your chemical feeding needs.

Standard Features

  • Rugged steel frame protected by corrosion resistant finish
  • Flexible iris or slide gate valve silo connector
  • Built-in stainless steel gravity fed hopper
  • Concentric helical overwind auger
  • Stainless steel 0.75″ to 3.25″ diameter solid auger or 1.5″ to 3.25″ diameter open helix auger
  • Water and dust proof NEMA 4X, SCR variable speed motor control capable of remote installation
  • 90 VDC right-angle, wash down gear motor
  • Integrated vibration mounts


  • Integrated “Loss in Weight” measurement system with four (4) load cells and Model AccuPro 5000 Digital controller
  • Multiple discharge spout styles
  • Custom auger styles and sizes
  • SCADA programmable and HMI PLC touch screen motor controllers
  • Washguard® and explosion proof motors
  • Mixing tanks, wetting cones and eductors
  • Vibratory agitators and particle crushers
  • Dust collectors
  • Base stands and elevated loading platforms


Feeder is 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