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OM Series Large Capacity Oval Gear Meters

use for almost any liquid transfer application

use for almost any liquid transfer application

The FLOMEC® OM Large Capacity Oval Gear meters have fitting sizes of 3 inches and 4 inches, and handle volumetric flow measurement of clean liquids used in a wide range of applications.

Large capacity OMs are well suited to precise measurement of fuels, oils, solvents, alcohols, mildly aggressive chemicals, and various other clean industrial liquids. Flow rates from 35L/min to 2500L/min, combined with low pressure drop, weights and measures (AU/NZ only) and various hazardous area certifications make the large capacity OM-Series meters applicable to almost any liquid transfer or application whether pumped or gravity-fed.

OM Series Oval Gear flow meters are perfect for measuring the transfer of thick or non-conductive liquids.

Sizes: 3-inch – 4-inch (75mm-100mm) Pipe Sizes | Flows from 10GPM - 600GPM (35L/min – 2500L/min) with Pulse-Out or LCD display

Owner's Manuals

Accuracy: ± 0.5% of reading (± 0.2% of reading with optional RT14)
Pressure Rating:

See Data Sheet

Temp Range:

-40° F to 300° F (-40° C to 150° C)

Flow Range: See Data Sheet




  • High accuracy and repeatability, measures every drop and saves waste in your process
  • Low pressure drop, minimising pumping costs
  • Extremely versatile design accurately measures high and low viscosity fluids
  • No requirement for flow conditioning (straight pipe runs) gives a simple and inexpensive installation
  • Only two moving parts provides a reliable product with minimal maintenance costs
  • IECEx/ATEX models available, making the product safe to use in flammable liquid applications


Typical applications include dispensing or bulk transfer of: 

  • Diesel fuel
  • Petrol (gasoline) with or without ethanol content
  • Biofuels
  • Kerosene
  • Glycols / Anti-Freeze
  • Diesel Exhaust Fluid (DEF / Adblue)
  • Lubricating oils and greases
  • Edible oils
  • Solvents
  • Resins and adhesives
  • Fertilizers, herbicides, insecticides