Oval Gear Chemical Flow Meters

Chemical Flow Meter (OM series)

FLOMEC Chemical Flow Meters offers accurate volumetric flow measurement of a broad range of clean water-based products and aggressive chemicals. The Flowmeters are also suitable for most fuels, fuel oils, and lubricating liquids.

More advantages:

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

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.

These meters can be used in gravity-fed application because of the high accuracy oval gear technology with low pressure drop.

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 PPS Flowmeters are used for;

Non-aromatic/non-halogenated organic chemicals
Water-based liquids
Diesel Exhaust Fluid
Petroleum
Strong acids
Oxidizers.

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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; 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 Series Chemical Flow Meter

Product Configuration

PRODUCT IDENTIFIER [1]
OM = Oval Gear Meter

METER SIZE [2]
025 = 1" (25 mm), 2.6 - 40 GPM (10-150 L/min)

BODY MATERIAL [3]
P = PPS

ROTOR MATERIAL / BEARING TYPE [4]
00 = PPS / No bearing
10 = Keishi cut PPS / No bearing

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

MAXIMUM TEMPERATURE LIMIT [6]
-8 = 176º F (80º C) max.

PROCESS CONNECTIONS [7]
1 = BSPP (RP) female threaded (ISO 7)
2 = NPT female threaded

CABLE ENTRIES [8]
1 = M20 x 1.5 mm (M16 x 1.5 mm for R4 option)
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
QP = Quadrature pulse (2 NPN phased outputs)
QPN = Quadrature pulse (2 NPN phased outputs) with Australian NMI & NZ approval for trade sale
R4 = RT40 rate totalizer with backlit large digit LCD [scalable pulse output, backlight]
R5 = RT14 backlit rate totalizer with all outputs (GRN Housing)
R7 = RT40 backlit rate totaliser in GRN housing
B11 = EB11 dual stage batch controller in GRN housing
F15 = F115 bi-directional flow rate/totaliser, 4-20mA and pulse outputs, in a GRN housing
F18 = F018 backlit rate/tot, pulse, 4-20mA, 10 point linearization, HART

DISPLAY CALIBRATION [10]
__ = Displays in Litres (DEFAULT)
G = Displays in US Gallons

Accessories

The Oval Gear Chemical Flowmeters has ceramic rotor pins as a standard, which makes it suitable for purposes where it does not suit or is permitted to use stainless steel.

Furthermore, the blind pulse meters are available with Reed Switch and Hall Effect outputs. You also have the option of quadrature pulse and integral 4-20mA outputs.

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.

See all the accessories here

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"(15 mm) - 4" (100 mm)
Nominal Flow Range* @ 3cP	0,26 GPM(1 L/min) - 660 GPM(2500 L/min)
Accuracy	±1% of reading for M registers. ±1% of reading for M registers (±0.5% for V registers)
Repeatability	Typically ± 0.03% of reading
Ambient Temperature Range	5° F - 176° F (-15° C to - 80° C)
Max. Pressure (threaded)	580 psi (40 bar) - 145 psi (10 bar)
M Register	4 digit resettable & NEMA 4 (IP65)
V Register	n/a 5 digit resettable & NEMA 3S (IP54)
Recommended Filtration	100 mesh (150 μm) - 40 mesh (400 μm)
Face-to-Face Dimension A - Threaded	4.33" (110 mm) - 12.6" (320 mm)
Face-to-Face Dimension A - Flanged	7.44"(189mm) - 16.3(414 mm)
Meter Base-to-Register Top - Dimension B	7.01"(178 mm) - 16.4" (416 mm)
Meter Cap Width	4.33" (110 mm) - 13.1" (332 mm)
Note	*Maximum flow reduces as viscosity increases. Max recommended Pressure drop is 14.5 psi (1 bar).

Model/ Type
Product Identifier	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, 35-750 L/min, 10-200 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 S: 316L Stainless Steel
Rotor/ Bearing Material	00: PPS 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	8: 80° C max. [176° F]
Process Connection	0: No fittings (Flomec 4 bolt flange) 1: BSPP (G) female threaded (ISO 228) 2: NPT female threaded 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	0: None
Mechanical Display	M3: 4 digit mechanical totalizer - Litres M4: 4 digit mechanical totalizer – US Gallons V1: 5 digit mechanical reset register - Litres

Specifications & Manuals

Data Sheet - Flowmec Oval Gear Chemical Flow Meter
English | pdf

Download
Manual - Flowmec Oval Gear Chemical Flow Meter (OM025)
English | pdf

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

Download

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Flomec Oval Gear Chemical Flow Meters

High accuracy and repeatability

Monitoring for precision

Typical Applications