Patent ID: 7225085

Claim:
A precision gas flow meter, comprising: a gas holding/measurement chamber; a gas inlet valve coupled to said chamber; a gas outlet valve coupled to said chamber; a pressure sensor positioned in said chamber; a temperature sensor positioned in said chamber; an electronic controller; and programming executable by said electronic controller for carrying out the operations of opening said gas inlet valve wherein gas flows into said chamber, measuring pressure and temperature gas collected in said chamber, closing said gas inlet valve when the pressure of the gas in said chamber reaches a predetermined value which corresponds to a predetermined increment gas volume; opening said gas outlet valve to allow gas to flow out of said chamber; closing said gas outlet valve; recording an increment volume of gas; calculating the total volume of gas since zero time and the volume of gas measured during a specified period of time; and outputting the total volume of gas since zero time and the volume of gas measured during a specified period of time to a display or recorder; wherein said gas flow is reversible.