Introduction

The FMR 150 Series is 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 robust design of the casing and the cartridge make the meter less sensitive to installation stresses caused by the connecting piping. The entire aluminum casing of the FMR is designed for working pressures up to 290psig with a safety factor of 4. The square impellers, improved position of the main bearings and shafts, make the meter more resistant to overload and pressure shocks. The aluminum index and the protection of the standard installed, low shocks. The aluminum index and the protection of the standard installed, low frequency Reed contact with the associated magnets, make the meter more resistant to tampering or manipulation. Strong neodymium magents can be used to manipulate meters, which is very difficult to detect or prove and a major concern for utility companies worldwide.

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Principle

The FMR rotary gas meter is a positive displacement meter. The measurement of the gas is performed by two figure 8-shaped impellers (rotors) rotating within a measurement chamber. During a full revolution of the rotors, a fixed volume is displaced from the inlet to the outlet of the meter. The number of revolutions represents the amount of volume passed. The volume is displayed on a direct reading mechanical counter/odometer. Several low and high frequency sensors can be used for flow computation or control purposes.

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Applications

The FMR 150 series is suitable for custody transfer measurement of all non-corrosive gases such as natural gas, propane, butane, air, hydrogen, etc.

 

Typical applications include:

• Gas distribution in low to medium pressure networks

• Industrial applications

• Master meters for test benches

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Accuracy

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.