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FMR 300 Series

FMR 300 & 600 Series


The FMR 300 & 600 Series are designed to accurately and reliably meet the highest demands of gas flow measurement. The meters are MID approved and fully comply with EN12480, OIML R137, and ANSI B109.3. The compact exchangeable aluminum cartridge allows local repair and on-site cleaning. 

The FMR 300 entire aluminum casing is designed for working pressures up to 500psi with a safety factor of 4 making it the lightest meter in its pressure class. The square impellers, improved position of the main bearings and shafts, make the meter more resistant to overload and pressure shocks.

The FMR 600 utilizes a steel casing with the same cartridge design and enhanced bearings for higher operating pressures up to 1450psi. The steel casing is designed to absorb pipe stresses caused by misalignments keeping the running stress free. For applications with higher then usual gas contaminations, the meter can be equipped with oilers for the rear bearings to flush out dirt.

Low Cost of Ownership

All FMR Series rotary meters use a fix gear ratio in the index head (no adjustment gears) making it a "one-fits-all" design. Together with the exchangeable cartridge design, the parts required for maintenance and repairs has been significantly lowered. The proprietary oiling system not only reduces wear and tear but keeps required oil changes over the meter's lifespan to a minimum.


The FMR 300 & 600 Series are suitable for custody transfer gas measurement of all non-corrosive gases such as Natural gas, propane, butane, air, hydrogen, etc.


Typical applications include:

  • Gas distribution in medium to high pressure networks Industrial applications

  • Compressed Natural Gas applications (NGV filling stations, etc.)


Each FMR rotary meter is tested with atmospheric air to traceable VSL (formerly NMi) calibrated references. It has been proven as part of the type approval testing that the difference between the accuracy at atmospheric air and at high pressure natural gas is negligible.

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