| 摘要 |
A gauge for measuring a pre-determined volume of liquid flowing therethrough comprising a conduit (418) for said liquid and a slug (424) positioned within said conduit, the slug having substantially neutral buoyancy in the liquid to be measured and being constructed and arranged such that it will move along the conduit at substantially the same rate as liquid flowing therein and is capable of being moved through the conduit with no net flow of liquid, the conduit comprising a constraint system (420, 422) defining a length of the conduit within which the slug is free to move, the gauge comprising detection (408, 410) means capable of detecting when the slug has moved a predetermined distance within the conduit. |
