Liquid flow sensing systems

Details Liquid flow sensing systems Liquid flow sensing systems

2011-05-10

2011-05-10

Thompson, Jewel (Department: 2855)

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

Reexamination Certificate

active

07938018

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.

REFERENCES:
U.S. Appl. No. 12/386,798, Alan Harper, Mar. 9, 2009.

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