OG4 Oval Gear Flowmeter: SummaryOG4 Oval Gear Flowmeter: FeaturesSTP File Download (3D File)OG4 Oval Gear Flowmeter: Overview (PDF download)OG4 Oval Gear Flowmeter: Instruction Sheet (PDF download)OG4 Oval Gear Flowmeter ImagesOG4 Oval Gear Flowmeter: Order CodesOval Gear Flowmeter Technical Notes

OG4 Oval Gear Flow Meters – Swept Volume Flow Meters: Summary

The compact rugged OG4 oval gear flowmeter – a swept volume flow measurement device, is designed to give high performance with a low cost of ownership. It has a standard flow range from 0.25 to 50 L/min on 30 cSt oil and 2.5 to 50 L/min on water like liquids. It can have totally non-metallic wetted components, PEEK™, ceramic and an elastomer which makes this the ideal choice for the metering of aggressive chemicals. The standard inlet and outlet are ¾' female threads. For OEM use alternatives, including manifold mountings, are available. The standard model is 316 St St with Viton® 'O' ring seal.

swept volume flow meters

OG4 Aluminium Swept Volume Oval Gear Flow Meter

OG4 Oval Gear Flow Meters – Swept Volume Flow Meters: Features

At the heart of the rugged OG4, swept volume oval gear flowmeter are a pair of toothed oval gears one of which contains chemically resistant magnets, the gears rotate freely on robust bearings. Rotation is detected through the chamber wall by a Hall effect detector or a reed switch giving approximately 115 pulses per litre passed. The output is an NPN pulse or a voltage free contact closure either of which is readily interfaced with most electronic display or recording devices. This combination of materials and technology ensures a long life product with reliable, accurate operation throughout.

  • Swept volume flow measurement device using oval gears
  • Excellent chemical resistance
  • Rugged construction
  • Individual calibration
  • High viscosity capability
  • Low pressure loss
  • No flow conditioning required
  • Compact meter assembly
  • Hall, reed switch or Namur sensor
  • Accuracy
    • 1.0% reading water
    • 0.5% reading oil
  • ±0.5% reading *
  • 0.1% repeatability
  • IP67/NEMA 4 protection
  • Models to 700 Bar
  • Non-metallic option
  • * When used with our metra-smar instrument

OG4 Oval Gear Flow Meters – Swept Volume Flow Meters are Ideal for

  • Engine test
  • Oil flow
  • High viscosity fluids
  • OEM equipment
  • Hazardous area flow measurement
flanged flow meters

OG4 Flanged Swept Volume Oval Gear Flow Meter, Flanged

OG4 Oval Gear Flow Meters – Swept Volume Flow Meters: Standard Materials of Construction

  • Body and cap – 316 St St
  • PEEK
  • Aluminium
  • 'O' Ring – Viton®
  • Gears – PEEK
  • Magnets – Ceramic


OG4 Oval Gear Flow Meters – Swept Volume Flow Meter Models

Flow range– Water2.5 – 50 LPM2.5 – 50 LPM2.5 – 50 LPM
– 30 cSt Oil0.25 – 50 LPM0.25 – 50 LPM0.25 – 50 LPM
Wetted materials– Body316 StainlessAluminiumPEEK™
– GearsCarbon filled PEEKCarbon filled PEEKCarbon filled PEEK
– SealViton®Viton®Viton®
– MagnetCeramicCeramicCeramic
Standard pressure rating50 Bar10 Bar10 Bar
Accuracy– Water± 1.0 % FSD± 1.0 % FSD± 0.5 % FSD
– 30 cSt Oil± 0.5 % Reading± 0.5 % Reading± 0.5 % FSD
Repeatability± 0.1 %± 0.1 %± 0.1 %
Detector typeHall effectHall effectHall effect
TerminationsVia M20 cable glandMIL style instrument socket4 PIN M12 connector
Approximate ‘K’
factor – Pulse/L

flow rate and viscosity of OG4 oval gear positive displacement flow meter

OG4 Oval Gear FLow Meter: 30cStk oil ‘K’ Factor vs Flow Rate

oval gear flow meters

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    OG4 Oval Gear Flow Meters – Swept Volume Flow Meters: Order Codes

    swept volume flow meters

    OG4 Aluminium Swept Volume Oval Gear Flow Meter

    oval gear flow meter supplier

    e.g. OG4-SS5-VHT-B is a stainless steel meter rated
    at 80°C, 50 Bar, Viton® seal, Hall effect detector
    and a 3/4' BSP thread.

    'O' rings – OG4 Oval Gear Flow Meters – Swept Volume Flow Meters

    Viton™ is the standard material for all of our flowmeters although nitrile and EPDM are available as options. Due to the vast number of differing chemicals that can be put through the flowmeter various other elastomer materials may be available for the flowmeter of your choice. Please contact your sales representative for technical help on this matter.

    Magnets – OG4 Oval Gear Flow Meters – Swept Volume Flow Meters

    The standard magnet material is ceramic which has very good chemical resistance in a wide range of fluids. They are attacked by some very strong acids and should be replaced with coated magnets if this is the case. The alternative coatings are PTFE and PVC depending on the meter size or the detection method, consult your representative for more information.

    Gear material – OG4 Oval Gear Flow Meters – Swept Volume Flow Meters

    PEEK™ is a high temperature engineering thermoplastic. It is tough, rigid and strong with very good chemical and radiation resistance. It retains its excellent mechanical and tribological properties at high temperatures. This valuable combination of properties makes PEEK™ an ideal material for our gears. The grade of material used is carbon fibre reinforced with added graphite and PTFE, these additives give extra strength and reduced friction but remain captive in the material matrix and do not compromise the chemical resistance. Alternative gear materials may be available, contact your distributor for more details.

    High temperature rotors – OG4 Oval Gear Flow Meters – Swept Volume Flow Meters

    Because of the high temperature characteristics of PEEK™ we can use the same material for all flowmeter temperature ranges. The standard meter is manufactured for use up to 80°C (176°F) but optional rotors are available for 100°C (212°F) and 150°C (318°F).

    High viscosity rotors – OG4 Oval Gear Flow Meters – Swept Volume Flow Meters

    The operation of the meter requires specially modified gears for use with high viscosity fluids, over 1000 cps. Above this viscosity the maximum flow capacity of the meter is reduced and the gears are modified. The low flow capability and the overall accuracy both improve dramatically. See the graph below for the percentage reduction in maximum flow with these thicker fluids.

    Flanges and pipe connections – OG4 Oval Gear Flow Meters – Swept Volume Flow Meters

    The standard products are shown on the appropriate data sheets but any meter can be manufactured with alternative fittings to suit your application, consult your distributor for details.

    Oval Gear Flow Meters - Viscosity Graph

    Swept Volume Flow Meters – Viscosity Graph

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