A non-invasive solution, the ultrasonic flow meter is ideal for applications with material incompatibility, or critical lines that can’t be shut-down. If the equipment is no longer needed for a specific purpose, it can be reinstalled on another pipe. Also suitable for high pressure applications, slightly contaminated fluids or sanitary environment, the FTI and Hontzsch ultrasonic flow meters are an economic flow measurement solution.
Theory of operation:
Ultrasonic transit time flow meters measure the difference of the transit time of ultrasonic pulses propagating in and against the direction of flow. This time difference is a measure for the average velocity of the fluid along the path of the ultrasonic beam. By using the absolute transit times both the averaged fluid velocity and the speed of sound can be calculated. Using the two transit times and the distance between receiving and transmitting transducers and the inclination angle one can write the equations:and where is the average velocity of the fluid along the sound path and is the speed of sound.
With wide-beam illumination transit time ultrasound can also be used to measure volume flow independent of the cross-sectional area of the vessel or tube.