OG6 Oval Gear Flowmeter: SummaryOG6 Oval Gear Flowmeter: FeaturesOG6 Oval Gear Flowmeter: Overview (PDF download)OG6 Oval Gear Flowmeter: Instruction Sheet (PDF download)OG6 Oval Gear Flowmeter ImagesOG6 Oval Gear Flowmeter: Order CodesOval Gear Flowmeter Technical Notes

OG6 Rugged Oval Gear Flowmeters: Summary

The rugged OG6 rugged oval gear flowmeter is designed to give high performance with a low cost of ownership. It has a standard flow range from 2.0 to 200 L/min on 30 cSt oil and 10 to
200 L/min on water like liquids. The standard inlet and outlet are 1½” female threads. For OEM use alternatives, including manifold mountings, are available. The standard models are 316 St St or Aluminium with Viton® ‘O’ ring seals.

aluminium oval gear flowmeter

OG6 Aluminium Oval Gear Flowmeter

OG6 Rugged Oval Gear Flowmeters: Features

At the heart of the OG6 rugged 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 21 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.

  • Excellent chemical resistance
  • Rugged construction
  • Individual calibration
  • High viscosity capability
  • Low pressure loss
  • No flow conditioning required
  • Hall, reed switch or Namur sensor
  • Accuracy
    • 1.0 % reading water
    • 0.5 % reading oil (30 cSt)
  • ±0.5% reading *
  • 0.1% repeatability
  • IP67/NEMA 4 protection
  • Models to 400 Bar
  • * When used with our metra-smart instrument

The OG6 rugged oval gear flowmeter is Ideal for

  • Engine test
  • Oil flow
  • High viscosity fluids
  • OEM equipment

OG6 Rugged Oval Gear Flowmeters – Standard Materials of Construction

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


OG6 Rugged Oval Gear Flowmeter Models

Sample product codes Stainless
Flow range – Water 10 – 200 LPM 10 – 200 LPM
– 30 cSt Oil 2.0 – 200 LPM 2.0 – 200 LPM
Wetted materials – Body 316 Stainless Aluminium
– Gears Carbon filled PEEK Carbon filled PEE
– Seal Viton® Viton®
– Magnet Ceramic Ceramic
Accuracy – Water ± 1.0 % FSD ± 1.0 % FSD
– 30 cSt Oil ± 0.5% Reading ± 0.5% Reading
Repeatability ± 0.1% ± 0.1%
Detector type Hall effect Hall effect
Terminations Terminal Block
P69 cable gland
Terminal Block
P69 cable gland
Approximate ‘K’
factor – Pulse/L
21 21

flow rate of swept volume oval gear flow meters

OG6 Rugged Oval Gear Flowmeters – Flow Rate

oval geared flow sensors

OG6 Rugged Oval Gear Flowmeters: Order Codes

aluminium oval gear flowmeter

OG6 Aluminium Oval Gear Flowmeter

oval geared flow sensor supply

e.g. OG6-SS5-VHP-B is a stainless steel meter
rated at 80°C, 50 Bar, Viton® seal, Hall effect
detector and a 11/2” BSP thread.

‘O’ rings – OG6 Rugged Oval Gear Flowmeters

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 – OG6 Rugged Oval Gear Flowmeters

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 – OG6 Rugged Oval Gear Flowmeters

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 – OG6 Rugged Oval Gear Flowmeters

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 – OG6 Rugged Oval Gear Flowmeters

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 – OG6 Rugged Oval Gear Flowmeters

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

Oval Gear Flow Meters – Viscosity Graph

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