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Capacitive electromagnetic flowmeter

  • US 7,874,218 B2
  • Filed: 06/29/2007
  • Issued: 01/25/2011
  • Est. Priority Date: 07/18/2006
  • Status: Active Grant
First Claim
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1. A capacitive electromagnetic flowmeter comprising:

  • a measuring pipe;

    an insulating resin lining provided on an inner peripheral surface of a magnetic pipe;

    an excitation coil for producing a magnetic field in a direction that is perpendicular to the direction of a fluid that is flowing within the measuring pipe;

    a through hole penetrating a side wall of a nonmagnetic pipe in a direction that is perpendicular to the magnetic field produced by the excitation coil;

    a signal electrode that is coupled by electrostatic capacitance with the fluid that flows within the measuring pipe, disposed with-in the through hole;

    a guard electrode for shielding the signal electrode, disposed within the through hole; and

    an insulating vibration absorbing material, filled into the through hole, so as to cover the entire periphery of the signal electrode and the guard electrode.

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