| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter which has a transmission body to which an ultrasonic transceiver is attached integrally formed with a measurement pipe, and makes it difficult for fine bubbles to be attached to an inner peripheral surface of the measurement pipe of the ultrasonic flowmeter.SOLUTION: The ultrasonic flowmeter 10 includes: a measurement pipe 1 for making a fluid flow within the pipe; and two ultrasonic transducers 3 each attached to a transmission body 2 disposed on an outside part of the measurement pipe 1 so as to be alienated from each other in an axial direction. The measurement pipe 1 and the two transmission bodies 2 are integrally formed. The internal diameter of the measurement pipe 1 is constant in a length direction at or below 5 mm, and the length of the measurement pipe 1 is 30 mm or longer. The arithmetic average roughness Ra of the inner peripheral surface of the measurement pipe 1 satisfies the following formula: 0 μm<Ra≤0.2 μm. |
