Patent ID: 7698958

Claim:
Differential pressure means for a gas meter arrangement which comprises a gas meter in a bypass to a gas pipe for measuring a gas consumption through the gas pipe, the differential pressure means being designed to be mounted in the gas pipe and having a plurality of flow ducts, which have a typical diameter, flow ducts being provided in various radial positions on the differential pressure means, wherein: a) those flow ducts which are arranged on the differential pressure means closer to a radial position which is close to the center have a larger diameter; and b) those flow ducts which are arranged on the differential pressure means closer to a radial position which is close to the perimeter have a smaller diameter; c) a ratio of the total length to the total diameter of the differential pressure means is selected to be greater than 1; d) the flow ducts have a round cross-section and the typical diameter is the diameter of inlet ports of the flow ducts; e) the flow ducts have a constant flow cross section over the entire length of the differential pressure means; and f) inlet ports and/or outlet ports of the flow ducts have countersink angles, wherein the flow ducts have diameters which decrease monotonically as the radial position increases, starting from a central axis of the differential pressure means.