| 摘要 |
<p>An ultrasonic flowmeter controller, comprising emitter sensor pairs coaxial to a rectilinear measurement tube which has a cross-section uniformly decreasing from its inlet, this latter being of annular radial extension symmetrical about the tube axis, and being provided with a grid of annular structure offering a resistance to passage of the fluid under examination which increases from the outer end to the inner end of the grid, and being connected to the tube by an annular inlet duct which is curved in the shape of a circular arc with a uniformly decreasing cross-section and comprises a deflection fairing of substantially conical extension in correspondence with the tube axis; an axial flow deflector is provided at the tube outlet to convey the fluid into an annular duct of decreasing cross-section, of which the radial exit port is closable by a valving member moved along the measurement tube axis by operating means. <IMAGE></p> |
