Importance

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Abstract

An improved fluid flow meter for measuring a liquid flow rate is disclosed. It comprises a container having an interior cavity, an inlet opening, a vent opening, a first passageway and a second passageway. The first passageway has an upper opening which is sealed by a pressure transducer and has a lower opening which opens into the interior cavity below the inlet and vent openings. A pressure signal produced in the first passageway by liquid in the cavity is converted into a flow rate by a processor which is connected to the pressure transducer. The second passageway has a lower opening in communication with the interior cavity above the lower opening of the first passageway and an upper opening below the upper opening of the first passageway which is connected to a downwardly depending drain tube to drain the level of liquid in the cavity down by siphon action. In one embodiment the vent opening and the second passageway are in communication with the upper portion of a second cavity which is provided below the first cavity and has a lower outlet opening.

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First Claim