| 摘要 |
Provided is a straight tube ultrasonic flow meter capable eliminating error causes in the ultrasonic wave measurement, and having further improved measurement accuracy. A straight tube ultrasonic flow meter (1) includes: a measuring unit (20) disposed within a measurement space (13) of a casing (10), the measuring unit having a tubular body for measurement (21) as a straight tube through which a fluid for measurement flows and a pair of oscillators (22a, 22b) disposed around an outer circumference of the tubular body for measurement (21) at a predetermined interval along an axial direction, the measuring unit (20) capable of measuring a flow rate of the fluid by obtaining a flow velocity of the fluid for measurement based on a difference in propagation time of ultrasonic wave from both directions detected between the oscillators (22a, 22b). The measuring unit (20) is fixed to the casing (10) and connected to an external pipe with a measuring unit protecting joint (30) interposed therebetween, the measuring unit protecting joint (30) restricting movement of the measuring unit (20) to a central side in the axial direction and rotation of the measuring unit (20) with respect to the casing (10), and providing a fluid flow channel.
|
