US Patent 8683875 Beta ratio changer for flow measurement devices

A beta ratio changer is provided for a flow measurement device having a fluid displacement member. The beta ratio changer includes a flange and a sleeve extending axially from the flange. The sleeve may be inserted into a fluid conduit of the fluid measurement device, reducing the inner diameter of the fluid conduit around the fluid displacement member. A new beta ratio may be determined from the diameter of the edge of the fluid displacement member and the inner diameter of the sleeve.