Model VMF-90E™ Volumetric Screw Feeder with Mixing Tank

Model VMF-90E Volumetric Screw Feeder with Mixing Tank


  • 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 3.6 cu. ft.
  • Feed rate 1.02 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-90E Volumetric Screw Feeder with Mixing Tank has been designed to be an “all in one” skid package option for adding a solution tank type dry chemical addition process. The VMF-90E 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-90E is the perfect choice when you need to control the addition of small to medium solution doses of chemicals to a process. To meet customer demands Scaletron has combined a rugged screw feeder, vibratory agitator, programmable control module, a number of standard upgrades, a solution mixing tank with mixer 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 solution tank type dry chemical feeding system, then Scaletron is sure the VMF-90E will meet and exceed your chemical feeding needs.

Standard Features

  • Rugged, carbon steel construction with corrosion resistant zinc oxide primed, dry powder epoxy coating
  • Built-in 3.6 cu. ft. gravity fed hopper with maintenance access hatch and integrated load cell attachment point
  • 1.5″ Diameter open helix feed screw in 304 stainless steel with “bayonet” style connection
  • Standard concentric material conditioning overwind auger
  • Electric vibratory hopper agitator/material conditioner
  • Remote location mountable, programmable SCR motor controller with HMI screen in water and dust proof NEMA 4X stainless enclosure
  • 90 VDC right-angle geared, wash down motor
  • 35 Gallon solution mixing tank with mixer motor and propeller


  • Integrated “Loss in Weight” measurement system with four (4) load cells and Model AccuPro 5000 Digital Controller
  • All 304 or 316 stainless steel construction (except feeder stand and base)
  • 316 Stainless steel augers and overwind helix augers
  • Explosion proof motors
  • Pneumatic vibratory agitator and particle crushers
  • 50 or 75 Gallon solution mixing tank
  • Dust collectors
  • Single 50 lb. bag loader (carbon steel or 304 stainless)
  • Lift-off, hinged, clamp-on and adapter lids
  • Elevated loading platform
  • 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