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Water meter

  • US 8,602,384 B2
  • Filed: 09/11/2009
  • Issued: 12/10/2013
  • Est. Priority Date: 07/31/2009
  • Status: Active Grant
First Claim
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1. A meter comprising:

  • an inlet for receiving a fluid;

    a housing defining a first cylindrical chamber receiving the fluid from the inlet, wherein a chamber axis passes through a center of the first cylindrical chamber;

    a first impeller housed within the first cylindrical chamber, wherein the first impeller provides one or more magnets;

    a magnetic switch provided adjacent to said first impeller, wherein the magnetic switch detects a number of rotations of said first impeller;

    a second cylindrical chamber defined by said housing for generating electric power, wherein said chamber axis passes through a center of the second cylindrical chamber;

    a second impeller housed within said second cylindrical chamber, wherein fluid flow through said second cylindrical chamber causes the second impeller to rotate;

    an outlet coupled to the housing, wherein the outlet is axially aligned with the inlet along a flow axis, and the flow axis does not intersect the chamber axis;

    a flow restrictor provided by the meter;

    a pressure differential sensor positioned to measure a pressure drop through the flow restrictor; and

    a processor coupled to said magnetic switch and said pressure differential sensor, wherein the processor calculates a pulse flowrate based on said number of rotations of said first impeller, and the processor calculates a pressure differential flowrate based on said pressure drop.

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