Electro-magnetic flow transducer with insulating scroll
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United States of America Patent
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Apr 20, 2004
Grant Date -
N/A
app pub date -
Mar 19, 2002
filing date -
Mar 19, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electro-magnetic transducer interacts with a fluid in a tube and serves as either a flow sensor or as a pump. One or more electro-magnet(s) provide a magnetic flux transverse to a selected portion of the tube. The transducer has an electrically insulating sheet scrolled about an axis parallel to or coincident with that of the portion of the tube and extending from an axial streamlined body to an inner wall of the tube. One or more pair of electrodes are attached to the scroll so as to define a spiral electrical path between the two electrodes of the pair. These electrodes are connected to a voltage measurement circuit if the transducer is configured as a flow sensor or to a source of electric power if the transducer is configured as a pump. In addition, a flow commencement sensor is combined with the electro-magnetic flow sensor to provide a power-saving flow metering arrangement.
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