US 7,464,611 B2 · Differential pressure means for a gas meter arrangement, comprising an improved flow geometry

Abstract

A differential pressure system and a gas meter arrangement for precisely measuring a gas consumption by a gas meter is provided. A previously known gas meter is disposed in a bypass comprising a differential pressure system in the gas pipe for measuring a volumetric flow rate inside the gas pipe. The differential pressure system includes flow ducts having decreasing diameters as the radial position increases starting from a central axis of the differential pressure system. Examples of execution include inlet ports and/or outlet ports of the flow ducts which are provided with a specific countersink angle (α), and an equidistant, concentric arrangement of flow ducts on the cross-sectional area of the differential pressure system. This has the advantage of increasing the differential pressure at a low volume flow rate, reducing the differential pressure at a high volume flow rate, and generally creating an improved linearity across the entire measurement range between the volume flow rate in the bypass and the volume flow rate in the gas pipe, among other advantages.

Claims12

Dependent claims

Gas meter arrangement for measuring a gas consumption, especially in a private, public or industrial domain, comprising:

a gas meter, which is arranged in a bypass to a gas pipe, and
a differential pressure means which is arranged in the gas pipe and has a plurality of flow ducts which have a typical diameter, the flow ducts being provided in various radial positions on the differential pressure means, wherein:
a) the flow ducts which have a radial position lying closer to an inlet port of the bypass, have a smaller diameter, and
b) the flow ducts which have a radial position lying further away from an inlet port of the bypass, have a larger diameter, and at least one of
c) an inlet port and an outlet port of the bypass are arranged on a side wall of the gas pipe;
and
d) a linear span of the bypass is selected to be larger than or equal to a total length of the differential pressure means and the differential pressure means is arranged in the gas pipe between the inlet port and the outlet port of the bypass, and wherein the gas meter is a CMOS anemometer.

4 more elements

Dependencies are inferred from the claim text.

Differential pressure means for a gas meter arrangement, comprising an improved flow geometry

Life of this patent

Differential pressure means for a gas meter arrangement, comprising an improved flow geometry

Life of this patent

Abstract

Claims12