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Enclosure for leak detector

  • US 9,593,999 B2
  • Filed: 06/08/2012
  • Issued: 03/14/2017
  • Est. Priority Date: 08/12/2011
  • Status: Active Grant
First Claim
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1. A leak detection sensor for attachment to a fire hydrant, the leak detection structure comprising:

  • a housing that is fixed to the fire hydrant, the fire hydrant defining an internal surface that defines a hydrant cavity, the housing being in fluid communication with the hydrant cavity, the housing having internal surfaces defining a housing cavity internal to the housing; and

    a leak detection subassembly, the leak detection subassembly including;

    at least one piezoelectric vibration sensor mounted with a fastener to an internal surface of the housing within the housing cavity, the at least one piezoelectric vibration sensor including a base and a piezoelectric layer deposited onto the base, the piezoelectric layer composed of piezoelectric crystals, the at least one piezoelectric vibration sensor arranged to receive a vibration from the housing via the fastener;

    at least one circuit arranged within the housing cavity and in electrical communication with the at least one piezoelectric sensor;

    an antenna in electrical communication with the at least one circuit;

    and wherein the housing is rigid.

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