Metra-Clear Oval Gear Flowmeter: SummaryMetra-Clear Oval Gear Flowmeter: FeaturesMetra-Clear Oval Gear Flowmeter: Overview (PDF download)Metra-Clear Oval Gear Flowmeter: Instruction Sheet (PDF download)Metra-Clear Oval Gear Flowmeter ImagesMetra-Clear Oval Gear Flowmeter: Order CodesMetra-Clear Oval Gear Flowmeter Technical Notes

Metra-Clear Oval Gear PD Flow Meter

The compact rugged acrylic topped Metra-Clear oval gear flowmeter is designed to give high performance with a low cost of ownership. The meters cover flow ranges from 0.01 to
100L/min on 30cSk oil and 0.1 to 100L/min on water like liquids. For OEM use alternatives, including manifold mountings, are available. The standard models have 316 St St aluminium or PEEK bodies with Viton® ‘O’ ring seals. For general meter specification see the appropriate OG data sheet.

mc2 metra clear oval gear pd flow meter by titan

MC2 Metra Clear Oval Gear PD Flow Meter

Metra-Clear Oval Gear PD Flow Meter

At the heart of the Metra-Clear oval gear flow meter are a pair of highly visible 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 an accurate number of 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.

  • Rugged construction
  • High visibility
  • Individual calibration
  • High viscosity capability
  • Low pressure loss
  • No flow conditioning required
  • Compact meter assembly
  • Hall or reed switch sensor
  • Accuracy
    • ±0.5% reading *
    • 0.1% repeatability
  • IP67/NEMA 4 protection
  • Non-metallic option
  • 10 Bar pressure
  • 60°C maximum temperature
  • 5 flow ranges
    * When used with our metra-smart instrument

The Metra Clear Oval Gear PD Flow Meter is Ideal For:

  • Engine test
  • Critical oil flow
  • High viscosity fluids
  • OEM equipment
mc4 metra clear oval gear pd flowmeter by titan

MC4 Metra Clear Oval Gear PD Flowmeter

Metra-Clear Oval Gear PD Flow Meter – Standard Materials of Construction

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

Metra-Clear Oval Gear, Positive Displacement Flow Meter (PEEK)

Metra-Clear Oval Gear, Positive Displacement Flow Meter (PEEK)

Metra-Clear Oval Gear, Positive Displacement Flow Meter ST ST & Aluminium

Metra-Clear ST ST & Aluminium

Metra-Clear Oval Gear PD Flow Meter Models

Flow range – Water 0.1–1.0 LPM 0.1–1.0 LPM
– 30 cSt Oil Stainless standard OG1-SS5-VHQ-B PEEK standard OG1-PS1-VHQ-B
Wetted materials – Body 316 Stainless St PEEK
– Gears Carbon filled PEEK™ Carbon filled PEEK™
– Seal Viton® Viton®
– Magnet Ceramic Ceramic
Accuracy – Water ± 1.0 % FSD ± 1.0 % FSD
– 30 cSt Oil ± 0.75% FSD ± 0.75% FSD
Repeatability ± 0.1% ± 0.1%
Detector type Hall effect Hall effect
Terminations M12 instrument socket M12 instrument socket
Approximate ‘K’
factor – Pulse/L
2050 2050

Metra Clear Flowmeter K' Factor vs Flow Rate

MC3 Metra Clear – Oval Gear Flowmeter – 30cStk oil – ‘K’ Factor vs Flow Rate

Metra-Clear Oval Gear PD Flow Meter: Sensor Block Diagram

metra clear flow meter block diagram

Metra Clear OG Flow Meter – Sensor Block Diagram

Metra-Clear Oval Gear PD Flow Meter: Order Codes

totalising flow meter & flow totaliser

OG2 Flow Totaliser – Oval Gear (PD) totalising flow meter


turbine flow sensor

e.g. MC3-SS1-VHH-B is a stainless steel meter
rated at 60°C, 10 Bar, Viton® seal, Hall effect
detector and a 1/2” BSP thread.

Metra Clear ‘O’ rings

Viton™ is the standard material for our Metra-Clear oval gear flow meters, 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.

Metra Clear Magnets

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.

Metra Clear Gear material

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.

Metra Clear High temperature rotors

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).

Metra Clear High viscosity rotors

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.

Metra Clear Flanges and pipe connections

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

Metra Clear Oval Gear Flow Meters – Viscosity Graph

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