Only applicable to flows without or with minimum presence of suspended particles or bubbles as they need a fluid free of elements that can block or alter the progress of the ultrasound beam. For its application is necessary to install two sensors in the pipe placed in both sites and displaced so that the ultrasonic beam moves on a diagonal.
The measurement principle is the measurement by difference of transit time of ultrasonic pulses propagating in and against the flow direction. This difference is a measure of average along the path of the ultrasound beam. Can be calculated using absolute transit times of both the fluid velocity and averaged sound velocity.
Ultrasonic flow meters can be shaped forma de carrete when the instrument is inserted in the pipe and being installed with flanges or threads or may be insertion when the customer installs the two sensors on the same line.