Patent ID: 6938496
Filing Date: 2005-09-06
Classification: G01F

Abstract:
1. A vortex flow pickup for measuring at least one of: mass flow, volume flow and flow velocity of a fluid which is flowing in a direction of flow in a measuring tube, having a tube wall with a bore therein, which vortex flow pickup, comprises: a bluff body which is arranged along a diameter of the measuring tube and serves for producing Karman vortices, said bluff body being connected to the tube wall of the measuring tube from the inside at a first and a second fixing location, which lie opposite each other; and a vortex sensor, which responds to pressure fluctuations produced by the vortices, said vortex sensor being fitted downstream of said bluff body in the bore of the tube wall of the measuring tube and seals off the bore, the center of the bore lying together with the center of said first fixing location of said bluff body on a generatrix of the measuring tube, said vortex sensor comprising: a diaphragm covering the bore, with a first surface facing the fluid and a second surface facing away from the fluid; a sensor vane, which is fastened on the first surface of the diaphragm and is shorter than the diameter of the measuring tube, said sensor vane has principal surfaces in line with the generatrix of the measuring tube and also at least one front edge, and is provided with a blind hole, a bottom of which lies in the vicinity of said at least one front edge; a temperature sensor, which is fixed on the bottom of said blind hole; and a sensor element fastened on said second surface, wherein: said temperature sensor is disposed within said sensor vane such that said temperature sensor being separated from the fluid to be measured.