Is a broad flow rate range, metering and low flow rate band of the lower end of the range, the gas flow to be supplied to the user in the band and and the wide have flow rate range is defined by the high-band of the upper end in the middle of the range sieve Dick gas metering system that is interposed in-line which runs from the gas source to the user site for. The system includes an output chamber which the input chamber and the gas receiving pressurized gas flows from said source is supplied therefrom to the user. Three gas flow channels to interconnect the chamber. The first channel is defined by a first fluidic generator operative to the flow rate of the gas is seen frequency when in the low band to generate a periodic pulse which is proportional to the flow quantity. The second channel is defined by a second fluidic generator operative to see the frequency at which the flow rate of the gas is in the middle band to generate periodic pulse proportional to the flow quantity. Third channel is defined by a bypass passage which operates only when said flow is in the high band, the bypass acts to divide the gas stream between said second and third channels, thereby the second generator weighing the flow rate in the intermediate band. Periodic pulse which is generated by the first and the second generator, are summed are processed in order to provide an accurate reading of the gas to be consumed by the user through the 該全 range.