Gwf Messsysteme Ag

H. Meinecke Ag

Sensus Metering Systems Gmbh Hannover

Holger Kuhlemann

Markus Helfenstein

Mark Frister

Jürgen Skripalle

Eckhard Kuhn

Karsten Nettemann

Disclosed is a flow meter with at least two measuring sensors, preferably ultrasonic sensors, spaced apart from each other, wherein the coupling of the measuring signals into and out of a fluid is performed via a coupling element According to the disclosure, the measuring channel is formed with an approximately oval or trapezoid cross-section.

Flow meter with measuring channel

Disclosed is a flow meter with at least two measuring sensors, preferably ultrasonic sensors, spaced apart from each other, wherein the coupling of the measuring signals into and out of a fluid is performed via a coupling element which is inserted flush into a circumferential wall of a measuring channel.

The present invention relates to water meters for the installation in pipe lines of a nominal width-group and a method for operating such water meters, which operate according to the Woltmann principle. The present invention addresses the problem of avoiding the calibration expenditures for each of the nominal widths of the nominal width-group and the disadvantages entailed therein. The solution of this problem, stated generally, is that in the water meters at the relevant site, namely in the annular channel ( ) directly in front of the impeller wheel ( ), independently of the nominal width of the connected pipe line, a substantially rectangular velocity distribution ( ) obtains with stream lines directed substantially parallel to the wall of the annular channel ( ), with these flow conditions being substantially identical at identical throughflows.

Water meters to be mounted in the pipe conduits of a nominal diameter class and method for operating such water meters

The turbine flowmeter includes an impeller wheel mounted, so that it can rotate, between an upstream hub and downstream hub in a tubular element. The hubs are mounted securely in the tubular element by ribs. A device for regulating to compensate measuring errors resulting from manufacturing tolerances is provided at least on the upstream hub. To provide the regulating effect as well as to avoid an asymmetric flow against the impeller wheel the regulating device includes a pivotable regulating part (6) including fins (9) and is located immediately downstream of the upstream hub (1) and a drive device for pivoting the rotatable regulating part (6) about the impeller-wheel axis (A) between an off position (O) in which fins (9) are located in a turbulence region immediately downstream of the ribs (4) in a flow direction (F) through the tubular element (5) and at least one pivoted position (P',P') in which fins (9) extend in a flow region between the ribs (4) and are uniformly circumferentially distributed around the regulating part (6) to deflect a flow past it.

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Sarstedt, Germany

Holger Kuhlemann