Patent ID: 9593999
Date: 2017-03-14
CPC Classifications: B26F,E03B,G01F,G01M,H01Q,Y02A,Y10T

Claim:
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.