Liquid flow sensing systems
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United States of America Patent
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May 10, 2011
Grant Date -
Feb 4, 2010
app pub date -
Apr 23, 2009
filing date -
May 3, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A liquid flow sensing system for sensing the flow of liquid within a supply line (2) of a metering pumping machine, the system including a magnetic member (4) arranged for movement relative to a pneumatic switch (8) operated by the presence or absence of a magnetic field, the magnetic member (4) being contained within a sealed unit (5) located within the supply line (2) and the arrangement being such that, when the liquid flow rate falls below a predetermined level, the magnetic member (4) moves downwardly from a first operative position into a second operative position.
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