Ultrasonic flow meter unit with an insulating damping member covering the ultrasonic transducers, a measuring circuit and lead wires

An ultrasonic flow meter unit mounted to a fluid passage through which a measurement target fluid flows, the ultrasonic flow meter unit comprising:

• a pair of ultrasonic transducers each including a piezoelectric substrate which generates an ultrasonic pulse, and an acoustic matching member, the pair of ultrasonic transducers being placed on the fluid passage such that the ultrasonic transducers mutually transmit and receive the ultrasonic pulse;
• a measuring circuit which is placed to connect with the fluid passage, and measures a flow of the measurement target fluid based on time for which the ultrasonic pulse propagates between the pair of ultrasonic transducers,
• wherein the measuring circuit and the pair of ultrasonic transducers are spaced apart from each other;
• and
• an insulating damping member arranged to cover both the measuring circuit and the pair of ultrasonic transducers such that the insulating damping member selectively covers the pair of ultrasonic transducers by contacting a mounting member arranged between each ultrasonic transducer and the fluid passage and covering the piezoelectric substrate, wherein the insulating damping member is arranged adjacent to the acoustic matching member without contacting the acoustic matching member.