Flow measuring apparatus
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United States of America Patent
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Aug 22, 1995
Grant Date -
N/A
app pub date -
Mar 1, 1993
filing date -
Mar 1, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
Apparatus for accurately and reliably measuring fluid flow under turbulent or pulsating conditions with high signal-to-noise ratio and using a symmetrical design which works with flow in either direction. The apparatus is particularly well-suited for measuring airflow in a bi-level respiratory system. The apparatus includes a flow conduit, an upstream sense tube protruding into the flow conduit with a notch opening facing into the flow stream, a downstream sense tube protruding into the flow conduit with a notch opening facing away from the flow stream, and a flow or pressure sensor/transducer disposed in connecting lines between the upstream and downstream sense tubes. The notched opening has a semi-cylindrical shape. The flow conduit is either straight or angled.
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