Small Capacity High Pressure Oval Gear Meters

Small Capacity High Pressure Oval Gear Meters (OM Series)

The FLOMEC Small Capacity High Pressure Flow Meters is part of the OM-series, and offer the ability to handle a wide range of fluid viscosities because of the increased flow range. This high pressure version provide volumetric measurement of low flow, clean liquids up to 400 bar.

More advantages:

Direct volumetric reading, which gives high accuracy and repeatability
Measures liquids both of high and low viscosity
No requirements for flow conditioning
Optional Exd I/IIB approval (ATEX, IECEx)
High pressure rated up to 400 bar (5580 psi)

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Contact us at marine@insatech.com.

High accuracy and repeatability

The Oval gear meter is a precise positive displacement flowmeter incorporating a pair of
oval geared rotors. The meter is, therefore, independent of viscosity and density, which means that the same high accuracy is obtained regardless of changes in the physical parameters.

The high accuracy is also achieved because of the direct volumetric reading, which also gives a high degree of repeatability.

Monitoring for precision

Oval Gear flowmeters are available as blind meters with a pulse signal output capable of
interfacing to most monitoring and control instrumentation.
Or the meter can be fitted with instruments such as totalizers, rate totalizers or batch controllers.

These instruments also have monitoring and control output options including 4-20mA, scaled pulse, flow-rate
alarms and batch control logic (preset metering).

Typical Applications

These flowmeters are capable of measuring the flow of a broad range of liquids, and suitable for applications including:

Metering lubricants
Chemicals
Grease
Additives
High viscosity fluids

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Usage in the maritime industry

Flomec OM-series is especially suitable for flow measurement / dosing of more viscous liquids such as oils, fuels and bunker C Fuel Oil.

Measure your fuel consumption

For an application such as fuel supply to a surplus dosing engine, both flow and return flow must be measured to achieve net consumption.

In addition, the temperature must be measured for volume compensation. For this we also provide temperature sensors and flow computers with standard API / ASTM tables defining the different fuel types.

Setting up a system using the OM-series flowmeter provide you with an accurate and reliable measurement of its fuel consumption.

Get more information here

Choose the right Flowmeter

The Oval Gear Meters use a measuring principle, where a pair of oval-shaped gears in a measuring chamber rotate by the force of the liquid on these. The liquid flows into a chamber and is sealed off once the chamber is full and produces either an electronic pulse or drives a gear to register the volume as it exits the chamber.

As illustrated in the example on the right, the pulse is generated because the (green) liquid is sealed from both the inlet (red liquid) and exit (blue liquid). This set up would produce four pulses as the meter transmits four identical volumes for every cycle.

Thus, it matters which Flomec flow meter you choose:

This matters because the simplest flowmeters register each time a bucket is filled. Here the total volume would be the sum of the number of buckets filled. In the complex meters the discrete volumes passed each time can be summed together to see the overall volume passing through the flowmeter.

See all Oval Gear Flow Meters here

FLOMEC® OM Series, Small Capacity, High Pressure Flow Meters

Product Configuration

PRODUCT IDENTIFIER [1]
OM = Oval Gear Meter

METER SIZE [2]
004 = 1/8” (4 mm), 0.26-9.5 GPH (1-36 L/hr)
006 = 1/4” (6 mm), 0.5-27 GPH (2-100 L/hr)
008 = 1/4” (6 mm), 4-145 GPH (15-550 L/hr)

BODY MATERIAL [3]
H = High Pressure 316L SS
5580 psi (400 bar)

ROTOR MATERIAL / BEARING TYPE [4]
00 = PPS (Not available for 300º F (150º C) meters) / No bearing (Available for OM008 only)
51 = Stainless Steel / Carbon Ceramic (Standard on OM004 & OM006, optional for OM008)
71 = Keishi cut Stainless Steel (For high viscosity liquids) / Carbon Ceramic (Available for OM008 only)

O-RING MATERIAL [5]
1 = Viton™ 5º F min. (-15º C)
3 = Teflon encapsulated Viton™ 5º F min. (-15º C)
4 = Buna-N (Nitrile), -40º F minimum (-40º C)

MAXIMUM TEMPERATURE LIMIT [6]
-2 = 250º F (120º C) max.
-3⁺ = 300º F (150º C) max. (Hall Only) (includes SS terminal cover)
-5 = 250º F (120º C) max. (includes integral cooling fin)
-8 = 176º F (80º C) max. (meters with integral instruments, OM008 with PPS rotors)

PROCESS CONNECTIONS [7]
1 = BSPP (G) female threaded (ISO 228)
2 = NPT female threaded
B = Bottom Entry Manifold (Intermediate Pressure Only)

CABLE ENTRIES [8]
1 = M20 x 1.5 mm (M16 x 1.5 mm for R4 options)
6 = 3 x 16 mm drilled holes (for F instruments only)

INTEGRAL OPTIONS [9]
___ = Combination Reed Switch and Hall Effect Sensor
SS = Stainless steel terminal cover]
RS = Reed Switch only - to suit Intrinsically Safe installations
E1 = Explosion proof Exd IIB T3...T6 [IECEx & ATEX approved]
E2 = Explosion proof Exd I/IIB T3...T6 [IECEx & ATEX mines approved]
HR = High resolution Hall Effect output (Hall Effect only) (not available on 008 size) [OM004:11200ppL, OM006:4200ppL]
H1 = Explosion proof - Exd with HR Hi-Res. Hall option [IECEx & ATEX approved] (not available on 008 size)
R6 = Intrinsically Safe RT14 with all outputs (GRN housing) [IECEx & ATEX approved]
R6G = RT14 Intrinsically Safe rate totalizer with all outputs (GRN Housing) [IECEx & ATEX approved] (with gallons calibration)
R4 = RT40 backlit rate totalizer with all outputs (Alloy housing with facia protector) [scalable pulse output, backlight]
R4G = RT40 rate totalizer with backlit large digit LCD (Alloy housings with facia) (with gallons calibration)
R5 = RT14 backlit rate totalizer with all outputs (GRN housing) [scaled pulse, alarms, 4-20mA, backlight]
R5G = RT14 backlit rate totalizer with all outputs (GRN Housing) (with gallons calibration)
E0 = EB10 batch controller [2 stage DC batcher & totalizer] (GRN Housing)
E0G = EB10 batch controller [2 stage DC batcher & totalizer] (with gallons calibration) (GRN Housing)
E18 = E018 backlit rate/tot, pulse, 4-20 mA, lin, HART (Al), Incl. Line Bushing [IECEx & ATEX approved]
E19 = E018 backlit rate/tot, pulse, 4-20 mA, lin, HART (SS), Incl. Line Bushing [IECEx & ATEX approved]
F18 = F018 backlit rate/tot, pulse out, 4-20mA, 10 pt lin, HART
F19 = F018 Intrinsically Safe backlit rate/tot, pulse out, 4-20mA, 10 pt lin, HART [IECEx & ATEX approved]
F31 = F130 Intrinsically Safe 2 stage batch controller (IECEx & ATEX approved)

Flomec OM00468 R47 A1 1024X16x9 (3) Test

Accessories

When you buy the Oval Gear Meters, they each, by default, contain a traceable calibration certificate and 2 pulse outputs in the form of a Reed contact and Hall effect sensor.

This means, that it can be used to either have dual resolution of the heart rate signal or as a backup.

Additionally, there is a wide selection of different LCD display types associated with this series, so you can get a display of the values for instantaneous flow (eg l / h or m³ / h) and total flow (eg l or m³).

You also have the option to get a traditional mechanical display.

Displays & Electronics

FAQ

Key Features of Flomec Flow Meters

The FLOMEC OM Series is an oval gear meter designed for accurate measurement of clean liquids, including gasoline, diesel fuel, and other petroleum-based products, as well as chemicals and food-grade fluids.

What industries typically use FLOMEC oval gear meters?

A: These meters are commonly used in marine fuel consumption monitoring, industrial process control, chemical dosing, and food & beverage production.

How does a FLOMEC oval gear meter work?

The OM Series uses precision oval gears that rotate as liquid flows through, accurately measuring each volume of liquid. The high repeatability and accuracy (±0.5% of reading) make it suitable for critical applications.

What flow rate range does the OM Series support?

Depending on the OM Series model, flow rates range from 1 L/min to 2,500 L/min, making it versatile for various fluid transfer applications.

What materials are available for the FLOMEC OM Series?

The FLOMEC oval gear meters are available in different materials, including stainless steel for aggressive chemicals and hygienic applications, aluminum for fuels like gasoline and diesel fuel, and PPS (polyphenylene sulfide) for cost-effective solutions.

What is the pressure rating of the FLOMEC OM Series flow meters?

The maximum pressure rating varies by model, with some meters handling pressures up to 1,000 PSI (69 bar).

Can the OM Series measure high-viscosity liquids?

Yes, FLOMEC oval gear meters are ideal for measuring high-viscosity fluids such as oils, lubricants, and syrups, with minimal pressure drop.

What types of fluids can the FLOMEC OM Series measure?

These meters are designed for clean liquids such as:

Fuels – Gasoline, diesel fuel, kerosene, and jet fuel
Chemicals – Solvents, coolants, and acids (with appropriate materials)
Food-grade liquids – Syrups, oils, and dairy products

What output options are available for the FLOMEC OM Series?

The OM Series offers pulse output, making it easy to connect to PLCs, fuel consumption monitoring systems, and remote displays.

What power supply is required for pulse output models?

The pulse models typically operate on 5–24V DC, depending on the specific configuration.

How is the OM Series installed?

The meter should be installed horizontally or vertically, ensuring proper flow direction, avoiding air bubbles, and allowing for accurate fuel consumption measurement.

Maintenance Tips for Optimal Performance

These meters are designed for long-term reliability with minimal maintenance, but periodic cleaning and inspection of the oval gears and seals can help maintain accuracy.

What should I do if my FLOMEC flow meter is not providing accurate readings?

Check for:

Proper installation (eliminating trapped air and flow pulsations)
Correct calibration for the liquid being measured
Debris or wear affecting the oval gears

Can I recalibrate my FLOMEC OM Series flow meter?

Yes, the meter can be field-calibrated to ensure repeatability and accuracy over time.

Selecting the Right Meter for Your Needs

Selecting the correct model depends on factors like fluid type, pressure requirements, flow rate, material compatibility (stainless steel, aluminum, PPS), and output needs.

For technical questions

Martin Søvind Jensen

Tel: +45 2761 4502

Email: Martin.Sovind@insatech.com

Write to Martin

For commercial inquiries

Astrid Mihut

Tel.: +45 5537 2095

Email: Marine@insatech.com

We Deliver Directly to End Customers, Resellers, and Agents – Globally

At Insatech, we are proud to offer our high-quality products to all customers worldwide. Whether you’re an end customer, a reseller, or an agent, you can purchase directly from us.

By choosing us, you gain direct access to all our products, eliminating the need for intermediaries. Our global distribution possibilities ensure fast and reliable delivery to your doorstep, wherever you are.

We strive to make it easy for you as an end consumer to find the products you are looking for while supporting agents and resellers looking to grow their business. Whether you’re buying for your use or resale, we’re here to meet your needs.

Discover how simple it is to work directly with a trusted global distributor – shop with confidence at Insatech today!

Technical Specifications
Normal Size	1/8"(4 mm) - 3/8" (8 mm)
Flow range	0,26 GPH(1.0 L/hr) - 145 GPH(550 L/hr)
Accuracy+ @ 3cp	± 1.0% of reading (± 0.2% of reading with optional RT14)
Repeatability	Typically ± 0.03% of reading
Temperature Range	-40° F to +300° F (-40° C to +150° C)

Model/ Type
Product Identifier	OM004: 1/8" (4mm) Oval Gear Meter, 1-36 L/hr, 0.26-9.5 USG/hr OM006: 1/4" (6mm) Oval Gear Meter, 2-100 L/hr, 0.53-26.4 USG/hr OM008: 3/8" (8mm) Oval Gear Meter, 15-550 L/hr, 4-145 USG/hr
Body Material	H: High Pressure 316L SS 5580 psi (400 bar)
Rotor/ Bearing Material	00: PPS (not suitable for Temp code 3) 51: Stainless Steel / Carbon Ceramic Bearing 71: High Viscosity Stainless Steel / Carbon Ceramic Bearing
Seal Material	1: Viton (-15° C min. [5° F]) 3: Teflon Encapsulated Viton / Kalrez (-15° C min. [5° F]) 4: Nitrile (not suited Temp Code 3) (-40° C min. [-40° F])
Temperature Rating	-2: 120° C max. [250° F] -3: 150° C max. [300° F] - Hall only, includes SS terminal cover (See note 1) -5: Cooling fin for meters with integral display (For temperatures between 80-120° C [176-250° F]) -8: 80° C max. [176° F] - select for meters with display, OM008 with PPS rotors, and OM025P
Process Connection	1: BSPP (G) female threaded (ISO 228) 2: NPT female threaded B: Bottom Entry Manifold (Intermediate Pressure Only)
Cable Entry	1: M20 x 1.5mm (M16 x 1.5mm for R4) 6: 3 x 16mm drilled holes (for F instruments only)
Intregral Option	(DEFAULT): Combination Reed Switch and Hall Effect Sensor SS: Stainless steel terminal cover RS: Reed Switch only - to suit Intrinsically Safe installations E1: IECEx/ATEX Explosionproof EXd IIB T6…T3 E2: IECEx/ATEX Explosionproof EXd I/IIB T6…T3 HR: High resolution Hall effect (NPN) output. OM004:11200ppL, OM006:4200ppL. (See note 2) H1: IECEx/ATEX Explosion proof - Exd with HR Hi-Res. Hall option. (See note 2) R6: RT14 IECEx/ATEX Intrinsically Safe rate totaliser with all outputs, in GRN housing. (See notes 3, 4) R6G: IECEx/ATEX RT14 Intrinsically Safe rate totalizer with all outputs, in GRN Housing (with gallons calibration) (See notes 3 + 4) R4: RT40 backlit rate totaliser with all outputs in Aluminium housing (Notes 3, 4) R4G: RT40 rate totalizer with backlit large digit LCD in Alloy housings with facia (with gallons calibration) (See notes 3, 4) R5: RT14 backlit rate totaliser with all outputs, in GRN housing (Notes 3, 4) R5G: RT14 backlit rate totaliser with all outputs, in GRN housing (with gallons calibration) (Notes 3, 4) E0: EB10 batch controller [2 stage DC batcher & totalizer] in GRN Housing. (See notes 3, 4) E0G: EB10 batch controller [2 stage DC batcher & totalizer] in GRN Housing (with gallons calibration). (See notes 3, 4) E18: E018 IECEx/ATEX EXd rate totaliser with 4-20mA and pulse outputs, HART (AI) communications (See note 4) E19: E018 IECEx/ATEX EXd rate totaliser with 4-20mA and pulse outputs, HART (SS) communications (See note 4) F18: F018 rate totaliser with 4-20mA and pulse outputs and HART communications (See note 4) F19: IECEx/ATEX F018 Intrinsically Safe rate totaliser with 4-20mA and pulse outputs and HART communications (See note 4) F31: IECEx/ATEX Intrinsically Safe 2 stage batch controller (See note 4)
Note(s)	Note 1. Option will de-rate meter pressure ratings by 20% Note 2. Not available on 008 size Note 3. Temp code 5 required for integral instruments between 80°C & 120°C Note 4. Temp code 8 required for integral instruments below 80°C

Specifications & Manuals

Data Sheet - High Pressure Small Oval Gear Flow Meters - Flomec
English | pdf

Download

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Flomec OM Small Capacity High Pressure Flowmeters

High accuracy and repeatability

Monitoring for precision

Typical Applications