The principal of the Rotary Gas Meter is well known. It is a positive displacement type of meter, passing pre-determined volumes of gas by means of two counter-rotating rotors or impellers. Four times per revolution a fixed unit of volume is displaced through the measurement chambers. The flowing gas volume is proportional to the number of revolutions of the output. The output of this model Rotary Gas Meter is a special designed magnetic coupling where one part is fitted inside the meter body and the associated part is placed in the read-out unit. The read-out unit can either be a mechanical index or an electronic index, with or without volume conversion and communication functions.
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