Patent ID: 8511180

Claim:
A flowmeter device for measuring a flow rate of a fluid, the device comprising: a conduit for the fluid flow, the conduit being characterized by a cross-sectional area, the conduit including at least one section within which the cross-sectional area is different from the cross-sectional area of at least one other section of the conduit; a reference tube separated from the conduit by a wall, the reference tube including at least one external opening to a space containing the fluid to enable the fluid to fill the reference tube from outside the conduit; at least one opening in the wall between said at least one section and the reference tube; and a flexible diaphragm forming a space between the diaphragm and a region of the wall at said at least one section, which includes the opening, to inhibit flow of the fluid between the conduit and the reference tube, the diaphragm being deformable so as to allow measuring of a parameter indicative of the deformation of the diaphragm in response to a difference between fluid pressure in said at least one section and fluid pressure in the reference tube.