| 摘要 |
The invention relates to a differential pressure means (4) and a gas meter arrangement (1) for precisely measuring a gas consumption (6a) by means of a gas meter (2). A previously known gas meter (2) is disposed in a bypass (3) comprising a differential pressure means (4) in the gas pipe (5) for measuring a volumetric flow rate (dV/dt, 6a) inside the gas pipe (5). According to the invention, the differential pressure means (4) comprises flow ducts (40) having decreasing diameters (D1>D2>D 3>D4) as the radial position (R1<R2 <R3) increases starting from a central axis (A) of the differential pressure means (4). Examples of executions include inlet ports (41) and/or outlet ports (42) of the flow ducts (40), which are provided with a specific countersink angle (a) and an equidistant, concentric arrangement of flow ducts (40) on the cross-sectional area (Q) of the differential pressure means (4). The invention has the advantage of increasing the differential pressure (4) at a low volume flow rate (dV/dt, 6a), reducing the differential pressure (4) at a high volume flow rate (dV/dt, 6a), and generally creating an improved linearity across the entire measurement range between the volume flow rate (6b) in the bypass (3) and the volume flow rate (dV/dt, 6a) in the gas pipe (5), among other things.
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