Patent ID: 8602384

Claim:
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.