Patent ID: 7673527

Claim:
A disposable flow cell ( 10 ) for measuring the flow rate of a fluid comprising: a fluid inlet and a fluid outlet separated by a sample flow-through channel ( 13 ) having an essentially straight part ( 12 ) therein; said flow cell includes two transducers ( 11 ) of ultrasonic waves axially aligned with each other on opposite sides of said channel ( 13 ); wherein ultrasonic waves transmitted by said transducers travel longitudinally in opposite directions in parallel with the flow direction through said essentially straight part ( 12 ) of said channel ( 13 ); the two transducers ( 11 ) of ultrasonic waves being reversibly detachable from the flow cell, wherein the angle of refraction of said longitudinal wave at the interface between the essentially straight part ( 12 ) of the channel ( 13 ) and said fluid is essentially 90°, wherein the channel is separated from the transducers ( 11 ) of ultrasonic waves by a plug ( 14 ) and wherein the flow cell with detached transducers ( 11 ) and the plug ( 14 ) are both produced from a single polymeric material.