Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Alan Roger Harper0
Date of Patent
May 10, 2011
0Patent Application Number
123867980
Date Filed
April 23, 2009
0Patent Primary Examiner
Patent 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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