Patent ID: 7694570

Claim:
An ultrasonic transducer for detecting liquid in a pipe or vessel comprising: a housing; a piezoelectric element within said housing facing one end of said housing and having connected signal leads that extend out from said housing to be connected to an electronic circuit that is to at least one of supply electrical energy to be transmitted by said piezoelectric element as ultrasonic energy and/or receive ultrasonic energy to be supplied to the electronic circuit as electrical signals; and a piece of double sided adhesive tape having one adhesive side secured directly to the outer face of said one end of said housing with the other adhesive side to be secured directly to the outer surface of the wall of a pipe or vessel and being of a material and thickness to effectively couple the ultrasonic energy in at least one of transmitting and receiving directions between said piezoelectric element, the pipe or vessel wall on which the transducer is mounted and a liquid in the pipe or vessel.