Medium Oval Gear Meters

Insatech Flomec OM Mekanisk Flowmåler OM025 ANSI RT40 FOR WEB PPT Square

Medium Capacity Oval Gear Meters (OM Series)

The FLOMEC Medium Oval Gear Meters offer the ability to handle a wide range of fluid viscosities because of the increased flow range. This gives you exceptional levels of repeatability.
Furthermore, these flowmeters are accurate, inexpensive in procurement, installation and maintenance.

More advantages:

Direct volumetric reading, which gives high accuracy and repeatability
Measures liquids both of high and low viscosity
No requirements for flow conditioning
Only two moving parts.

We deliver directly and globally to end-users, agents, and resellers.
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).

Insatech Flomec OM Mekanisk Flowmåler OM040 Right FOR WEB PPT Square

Typical Applications

For marine applications the medium sized oval gear flow meters are primarily used on medium sized vessels for diesel consumption measurements.

These flowmeters are capable of measuring the flow of a broad range of liquids;

Oils
Fuel
Batching
Diesel
Bunker C Fuel Oil
Industrial Fluids
Clean Fluids
Chemical Feed Lines
Truck metering
Chemical Additive Injection.

Does it match your need - contact us here

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

Insatech Flomec OM Mekanisk Flowmåler OM015 No Cap Front FOR WEB PPT 16 9

Insatech Flomec OM Mekanisk Flowmåler OM040 Right FOR WEB PPT 16 9

Insatech Flomec OM Mekanisk Flowmåler OM025 ANSI RT40 FOR WEB PPT 16 9

Insatech Flomec OM Mekanisk Flowmåler OM015 Side Right FOR WEB PPT 16 9

Insatech Flomec OM Mekanisk Flowmåler OM015 Left FOR WEB PPT 16 9

Insatech Flomec OM Mekanisk Flowmåler OM040 Flange Off FOR WEB PPT 16 9

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 Flowmeter you choose:

This matters because the simplest meters 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 meter.

See all Oval Gear Flow Meters here

Flomec OM Series Oval Gear Princip 1024X16x9

FLOMEC® OM Medium Capacity Oval Gear Meters

Product Configuration

PRODUCT IDENTIFIER [1]
OM = Oval Gear Meter

METER SIZE [2]
015 = 1/2” (15 mm), 0.26-10.6 GPM (1-40 L/min)
025 = 1” (25 mm), 2.6-40 GPM (10-150 L/min)
040 = 1-1/2” (40 mm), 4-66 GPM (15-250 L/min)
050 = 2” (50 mm), 8-118 GPM (30-450 L/min) with SS Rotors
050 = 2” (50 mm), 8-130 GPM (30-500 L/min) with PPS Rotors

BODY MATERIAL [3]
A = Aluminum
M = Intermediate pressure aluminum meter (2000 psi [138 bar]
max.) (OM025 only)
S = 316L Stainless Steel
N = Intermediate Pressure 316L SS (OM015-OM025N = 1450 psi [100 bar]) (OM040N-OM050N = 725 psi / 50 bar)

ROTOR MATERIAL / BEARING TYPE [4]
00 = PPS (not available for 300º F [150º C] meters) / No bearing
10 = Keishi cut PPS (for high viscosity liquids) (not available for 300º F [150º C] meters) / No bearing
51 = Stainless Steel / Carbon Ceramic
71 = Keishi cut Stainless Steel (for high viscosity liquids) / Carbon Ceramic

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 Effect) (includes SS terminal cover)
-5 = 250º F (120º C) max. (includes integral cooling fin)
-8 = 176º F (80º C) max. (meters with integral instruments)

PROCESS CONNECTIONS [7]
0 = No fittings (Not available on 015 size)
1 = BSPP (G) female threaded (ISO 228)
2 = NPT female threaded
3 = Sanitary Fittings (are 1/2” (13 mm) larger than meter size)
4 = ANSI-150 RF Flanged
5 = ANSI-300 RF Flanged
6 = PN16 DIN Flanged

CABLE ENTRIES [8]
1 = M20 x 1.5 mm (M16 x 1.5 mm for R4 options)
2 = 1/2 in. NPT
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 (Aluminum & Stainless meters) [IECEx & ATEX approved]
E2 = Explosion proof Exd I/IIB T3...T6 (stainless meters only) [IECEx & ATEX mines approved]
QP = Quadrature pulse (2 NPN phased outputs)
QPN = Quadrature pulse (2 NPN phased outputs) with Australian NZNMI approval for trade sale
Q1 = Explosion proof Exd (with quadrature pulse) [IECEx & ATEX approved]
Q1N = Explosion proof Exd (IECEx & ATEX) with Quadrature pulse with Australian NMI & NZ approval for trade sale (Not available on 015 size)
R3 = Intrinsically safe RT12 with all outputs (GRN housing) [IECEx & ATEX approved]
R3G = RT12 Intrinsically Safe rate totalizer with all outputs (GRN Housing) [IECEx & ATEX approved] (with gallons calibration)
R4 = RT40 rate totalizer with backlit large digit LCD [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)
R5G = RT14 backlit rate totalizer with all outputs (GRN Housing) (with gallons calibration)
E18 = E018 backlit rate/tot, pulse, 4-20mA, 10 point linearization, HART, aluminium body [IECEx & ATEX approved] (Not available with 015 size)
E19 = E018 backlit rate/tot, pulse, 4-20mA, 10 point linearization, HART, stainless steel body [IECEx & ATEX approved] (Not available with 015 size)
F18 = F018 backlit rate/tot, pulse, 4-20mA, 10 point linearization, HART
F19 = F018 backlit rate/tot, pulse, 4-20mA, 10 point linearization, HART, Intrinsically safe [IECEx & ATEX approved]
F31 = Intrinsically safe F130 2 stage batch controller [IECEx & ATEX approved]

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	1/2"(13 mm) - 2" (51 mm)
Flow range	0,26 GPM(1 L/hr) - 130 GPM(500 L/hr)
Accuracy @3cp	± 0.5% of reading (accuracy is ± 0.2% of reading with optional RT14 with non-linearity correction)
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 OM015: 1/2” (15mm) Oval Gear Meter, 1-40 L/min, 0.26-10.6 USG/min OM025: 1” (25mm) Oval Gear Meter, 10-150 L/min, 2.6-40 USG/min OM040: 1.5” (40mm) Oval Gear Meter, 15-250 L/min, 4-66 USG/min OM050: 2” (50mm) Oval Gear Meter, 30-450 L/min, 8-120 USG/min OM080: 3” (80mm) Oval Gear Meter, 50-1000 L/min, 13-260 USG/min OM100: 4” (100mm) Oval Gear Meter, 75-1500 L/min, 20-400 USG/min OM100: 4” (100mm) Oval Gear Meter, 150-2500 L/min, 40-660 USG/min
Body Material	A: Aluminium E: Extended flow Aluminium M: Intermediate pressure aluminium N: Intermediate pressure Stainless Steel S: Stainless Steel P: PPS (PPS rotors only, temp code 8, BSP/NPT, safe area only)
Rotor/ Bearing Material	00: PPS (not suitable for Temp code 3) 10: High Viscosity PPS (not suitable for Temp code 3) 44: Aluminium/Hardened Steel Roller Bearing (100E only) 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 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	0: No fittings 1: BSPP (G) female threaded (ISO 228) 2: NPT female threaded 3: Tri-clamp ferrules (1/2" larger than meter size) 4: ANSI-150 RF flanged ANSI-150 RF flanged - SS Meters 5: ANSI-300 RF flanged 6: PN16 DIN flanged DIN flanged - SS Meters
Cable Entry	1: M20 x 1.5mm (M16 x 1.5mm for R4) 2: 1/2" NPT 6: 3 x 16mm drilled holes (for R7/F15/F18/F19/F31)
Intregral Option	(DEFAULT): Reed switch & Hall Effect (NPN) outputs SS: Stainless steel terminal cover RS: Reed Switch only (Note 4) E1: IECEx/ATEX Explosionproof EXd IIB T6…T3 Gb (Note 4) E2: IECEx/ATEX Explosionproof EXd I/IIB T6…T3 Gb (SS meters only) FP: cFMus Approved, USA and Canada, Flameproof Class 1 Zone 1 (Note 4) QP: Quadrature pulse (2x NPN outputs) QPN: Quadrature pulse (2x NPN outputs) with. Australian / New-Zealand weights and measures approval Q1: Combination of E1 and QP Integral Options Q1N: Combination of E1 and QPN Integral Options HR: High resolution Hall effect (NPN) output H1: Combination of E1 and HR Integral Options R4: RT40 backlit rate totaliser in Aluminium housing (Notes 1, 2) Requires Cable Entry option 1 R5: RT14 backlit rate totaliser with 4-20mA and pulse outputs, in GRN housing (Notes 1, 2) R6: RT14 IECEx/ATEX Intrinsically Safe rate totaliser with 4-20mA and pulse outputs, in GRN housing (Notes 1, 2, 4) R7: RT40 backlit rate totaliser in GRN housing (Notes 1, 2, 5) B11: EB11 single stage batch controller in GRN housing (Notes 1, 2) E18: E018 IECEx/ATEX EXd rate totaliser with 4-20mA and pulse outputs, HART communications, in an Aluminium housing (Notes 2, 3) E19: E018 IECEx/ATEX EXd rate totaliser with 4-20mA and pulse outputs, HART communications, in a SS housing (Notes 2, 3) F15: F115 bidirectional flow rate/totaliser, 4-20mA and pulse outputs, in a GRN housing (Notes 1, 2) F18: F018 rate totaliser with 4-20mA and pulse outputs and HART communications, in a GRN housing (Notes 1, 2, 5) F19: F018 Intrinsically Safe rate totaliser with 4-20mA and pulse outputs and HART communications, in a GRN housing (Notes 1, 2, 4, 5) F31: Intrinsically Safe 2 stage batch controller (Notes 1, 2, 4, 5).
Calibration (for integral display models only)	(DEFAULT): Displays in Litres G: Displays in US Gallons
Note(s)	Note 1. Temp code 5 (cooling fin) is required for integral instruments with operating temperature between 80-120° C [176-250° F] Note 2. Temp code 8 is required for integral instruments with operating temperature up to 80° C max. [176° F] Note 3. Not available with OM080, OM080E, OM100, OM100E Note 4. Not available with OM025P Note 5. Only available with Cable entry code 6 Note 6. OM050 with PPS rotors 30 - 500 L/min [8 - 130 USG/min] with lubricating liquids, not for NMI use.

Specifications & Manuals

Owners manual - Oval Gear flowmeter - Flomec
English | pdf

Download
Data Sheet - Medium Oval Gear Flowmeter - Flomec
English | pdf

Download
Data Sheet - Fuel Consumtion System Marine - Flomec
English | pdf

Download
Data Sheet - Om Series Mechanical Flowmeter - Flomec
English | pdf

Download

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Flomec OM Medium Capacity Oval Gear Meters

High accuracy and repeatability

Monitoring for precision

Typical Applications