Patent ID: 7404337
Filing Date: 2008-07-29
Classification: G01F

Abstract:
1. A fluid flow metering apparatus, comprising: a) a housing having a wall portion forming a flow chamber including an entrance and an exit for allowing fluid to be passed through said chamber; b) a flow directing body located in said chamber and including a first conical portion positioned adjacent said chamber entrance, a second conical portion positioned adjacent said chamber exit, and a cylindrical portion intermediately positioned relative to said first and second conical portions; c) support means for holding said body within said chamber; d) a tuning member located in said housing chamber at least in part between said body and said entrance to said housing chamber, said tuning member including an orifice of a predetermined size selected to focus the passage of fluid across said flow directing body; e) a first pressure probe communicating with said chamber, said first pressure probe obtaining a first pressure measurement at the apex of said first conical portion of said body; and f) a second pressure probe communicating with said chamber, said second pressure probe obtaining a second pressure measurement at said cylindrical portion of said body, wherein the size of the orifice in said tuning member is selected to determine the operational flow measuring range of the flow metering apparatus.