Model VMF-28 PM™ Volumetric Screw Feeder for Polymer Mixing

Model VMF-28 PM Volumetric Screw Feeder for Polymer Mixing


  • Automatic metering screw feed system for mixing and dispensing dry polymers into a secondary process
  • Ideal for water, wastewater and chemical processing applications
  • Complete skid mounted system with aging/mixing tanks, pumps and piping
  • 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 PM Volumetric Screw Feeder for Polymer Mixing has been designed to be an “all in one” skid package option for polymer mixing and dispensing. The VMF-28 PM is capable of accurately dispensing dry polymers found in the water and waste water industries. The VMF-28 PM is the perfect choice when you need to control the addition of small to medium solution doses of polymers to a process. To meet customer demands Scaletron has combined a rugged screw feeder, programmable control module, a number of standard upgrades, two (2) aging/mixing tanks, and a progressive cavity pump and then mounted it all to a base that will fit through almost any normal size doorway. If you are looking to do a “one and done install” for a polymer mixing and dispensing system, then Scaletron is sure the VMF-28 PM will meet and exceed your needs.

Standard Features

  • Rugged steel frame protected by corrosion resistant finish
  • Aging/mixing tanks and progressive cavity pump
  • 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, SCADA programmable variable speed motor controller capable of remote installation
  • 90 VDC right-angle geared, wash down 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
  • HMI PLC touch screen motor controllers
  • Explosion proof motors
  • Wetting cones and eductors
  • Vibratory agitators and particle crushers
  • Dust collectors
  • Elevated loading platforms
  • Programmable controller module stand


Feeder and scale are designed to accurately dispense:

  • Polymers and other dry powders or pelletized materials