Patent ID: 8770041

Claim:
A fluid meter which includes: a housing which comprises a cavity that defines a flow bore through which a fluid to be metered is directed; a rotor which is rotatably supported in the cavity and is set into rotation by the fluid flowing through the flow bore; a cover which is secured to the housing over the cavity to thereby contain the fluid in the flow bore, the cover comprising are opening in axial alignment with the rotor; a first magnet which is connected to an axial end portion of the rotor adjacent the opening; a second magnet which is positioned adjacent the opening and is magnetically coupled to the first magnet; a cap member which is positioned between the first and second magnets and is secured to the cover over the opening to thereby isolate the second magnet from the fluid in the flow bore; and a rotary encoder which is operatively coupled to the second magnet; wherein rotation of the rotor is magnetically transmitted through the cap member from the first magnet to the second magnet and is detected by the rotary encoder.