The FMG rotary gas meter is a displacement type gas meter. The meters are designed for fiscal use (MID approved by the NMi). The aluminium casing of the FMR (body and front plate) is designed for working pressures up to 40 barg with a safety factor of 4. The square impellers and the improved position of the main bearings and shafts, make the meter less sensitive to overload and pressure shocks.