OG3 Oval Gear Flowmeter: SummaryOG3 Oval Gear Flowmeter: FeaturesSTP File Download (3D File)OG3 Oval Gear Flowmeter: Overview (PDF download)OG3 Oval Gear Flowmeter: Instruction Sheet (PDF download)OG3 Oval Gear Flowmeter ImagesOG3 Oval Gear Flowmeter: Order CodesOval Gear Flowmeter Technical Notes

OG3 (Oval Gear) Positive Displacement Flow Meters

The compact rugged OG3 oval gear positive displacement flowmeter is designed to give high performance with a low cost of ownership. It has a standard flow range from 0.05 to 10 L/Min on 30 cSt oil and 0.5 to 10 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 ½' female threads. For OEM use alternatives, including manifold mountings, are available. The standard model is 316 St St with Viton® 'O' ring seal.

stainless steel oval gear flow meter

OG3 Stainless Steel Oval Gear Positive Displacement Flow Meter

OG3 (Oval Gear) Positive Displacement Flow Meters

At the heart of the OG3 oval gear positive displacement flow meter are a pair of toothed oval gears one of which contains chemically resistant magnets. Rotation is detected through the chamber wall by a Hall effect detector or a reed switch giving approximately 440 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.

  • Oval gear positive displacement flow meter/sensor
  • 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
    • ±0.5% FSD water
    • ±0.50% reading oil (30 cSt)
  • ±0.50% reading *
  • 0.1% repeatability
  • IP67/NEMA 4 protection
  • Models to 700 Bar
  • Non-metallic option
    * When used with our metra-smart

The OG3 (Oval Gear) Positive Displacement Flow Meter is Ideal for:

  • Engine test
  • Critical oil flow
  • High viscosity fluids
  • OEM equipment
  • Hazardous areas
aluminium oval gear flow meters

OG3 Aluminium Oval Gear Flow Meters

OG3 Positive Displacement (PD) Oval Gear/Swept Volume Flow Meters – Standard Materials of Construction

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

OG3 PD Oval Gear, Positive Displacement/Swept Volume Flow Meter Models

Flow range– WaterStainless
Flow range– Water0.5 – 10.0 LPM0.5 – 10.0 LPM0.5 – 10.0 LPM
– 30 cSt Oil0.05 – 10 LPM0.05 – 10 LPM0.05 – 10 LPM
Wetted materials– Body316 StainlessAluminiumPEEK
– GearsCarbon filled PEEKCarbon filled PEEKCarbon filled PEEK
– SealViton®Viton®Viton®
– MagnetCeramicCeramicCeramic
Accuracy– Water± 0.5 % FSD± 0.5 % FSD± 0.5 % FSD
– 30 cSt Oil± 1% Reading± 1% 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
Approximate ‘K’
factor – Pulse/L

viscosity of og3 oval gear positive displacement flow meter

OG3 Oval Gear PD Flow Meter Viscosity

OG3 Oval Gear Positive Displacement Flow Meter: Sensor Block Diagram

OG3 Oval Gear Positive Displacement Flow Meter: Order Codes

positive displacement flow meter

OG3 Oval Gear Positive Displacement Flow Meter

positive displacement og ordercodes

e.g. OG3-SS5-VHH-B is a stainless steel meter rated
at 80°C, 50 Bar, Viton® seal, Hall effect detector
and a 1/2' BSP thread.

'O' rings – OG3 Oval Gear Positive Displacement Flow Meter

Viton™ is the standard material for the OG3 Oval Gear Positive Displacement Flow Meter 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 – OG3 Oval Gear Positive Displacement Flow Meter

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 – OG3 Oval Gear Positive Displacement Flow Meter

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 – OG3 Oval Gear Positive Displacement Flow Meter

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 – OG3 Oval Gear Positive Displacement Flow Meter

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 – OG3 Oval Gear Positive Displacement Flow Meter

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

OG3 Oval Gear Positive Displacement Flow Meter – Viscosity Graph

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