Patent ID: 9261389
Filing Date: 2016-02-16
CPC Classification: G01F

Claim Text:
1. An ultrasonic flowmeter comprising an elongate duct through which fluid flows when the flowmeter is in use, ultrasonic transducers arranged respectively to transmit and receive ultrasonic pulses propagated through such fluid when the flowmeter is in use, and electronic circuitry connected to the transducers to provide a measure of the time delay between emission of an electronic pulse from one of the transducers and reception of the pulse by the other of the transducers, and constructed to enable an output to be provided which is dependent upon that delay and which is indicative of the rate of flow of fluid through the duct, in which the transducers are located respectively at opposite ends of the duct and are arranged to transmit and receive ultrasonic pulses propagated through the fluid substantially parallel to the duct from one end thereof to the other, wherein the transducers are provided with respective vibratory surfaces which transmit and/or receive ultrasound, which vibratory surfaces have a diameter which exceeds the cross-sectional diameter of the duct.