| 摘要 |
A device (1; 101) for measuring fluid flow rates has a body (2; 102) defining a conduit (2a; 102a) for the fluid, the body having selectable first and second configurations, wherein in the first configuration the body presents a first constriction (6; 106) in the conduit for measuring a first range of fluid flow rates, and in a second configuration the body presents a second constriction (8; 108) in the conduit for measuring a second range of fluid flow rates, the second constriction being narrower than the first constriction, wherein the body is arranged for operative connection to means (4, 7, 9; 104; 107; 109) for determining the pressure difference between each constriction.
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