Abstract: The present invention is directed to a flow measuring device according to the principle of the Karman vortex path, with a vortex-generating choke body which is adapted to be positioned within a pipe section and which comprises a prismatic forward part of trapezoidal cross-section which is positioned in said pipe section with its larger forward parallel surface against the flow direction, and a slab-shaped extension which follows the prismatic part's rearward parallel surface and which extends in the flow direction, and which also includes pressure pickups positioned inside said prismatic part of the choke body, such that said pickups can measure the periodic pressure variations which are generated by the vortex separation.

Abstract: Flow measuring device with a vortex-generating choke body which is arranged within a pipe section and consists of a prismatic forward part of trapezoidal cross-section and a parallelepiped-shaped extension projecting from the smaller surface of said prismatic part. In the interior of the prismatic part, two parallel pressure chambers are positioned transversely to the flow direction, which are connected via rows of openings or slots to the rear of the prismatic part, above and below the extension to form a pneumatic R-C combination. Pressure pickups for measuring the periodic pressure variations which are generated by the vortex separations and are proportional to the flow velocity, are arranged in the pressure chambers or in pressure-conducting connection therewith. By means of the R-C combination, the phase equality of the vortex separations over the width of the choke body is improved and the fading is reduced.