Ultrasonic Flow Metersby Nagmanflow L. water Meter Test Bench, Flow Meter
UltrasonicFlow Meters use sound waves to regulate the velocity of a fluid flowing in a pipe. At no flow conditions, the occurrences of an ultrasonic wave diffused into a pipe and its reflections from the fluid are the same. Under flowing settings, the frequency of the reflected wave is different due to the Doppler Effect. When the fluid moves quicker, the frequency shift rises linearly. The transmitter processes signals from the conducted wave and its reflections to govern the flow rate.
Ultrasonic Flow Meters do not hinder flow so they can be useful to sanitary, corrosive and abrasive liquids. Specific ultrasonic Flow Meters use clamp-on transducers that can be fixed external to the pipe and do not have any wetted parts. Short-term flow measurements can be made using portable ultrasonic flow meters with clamp-on transducers. Clamp-on transducers are specifically useful when piping cannot be bothered, such as in power and nuclear industry applications. In addition, clamp-on transducers can be used to measure flow deprived of materials of construction, corrosion, and abrasion problems. Nevertheless attractive, the use of clamp-on transducers presents additional ultrasonic interfaces that can affect the dependability and performance of these flow meters. When they are not applied properly and maintained, weakening of the ultrasonic signal can happen at the interfaces between the clamp-on transducers and the outside pipe walls, inside pipe walls and the fluid.
Ultrasonic flow meters are typically applied to measure the velocity of liquids that permit ultrasonic waves to pass, such as water, liquids, and chemicals. Transit time designs are also accessible to measure gas and vapour flow. Be cautious since fluids that do not pass ultrasonic energy, such as many varieties of slurry, restrict the diffusion of ultrasonic waves into the fluid. In Doppler ultrasonic flowmeters, dense fluids can restrict ultrasonic wave penetration too nearby the pipe wall, which can reduce accuracy and cause the flow meters to fail to measure. Transit time ultrasonic flowmeters can cease to function when an opaque fluid fails the ultrasonic wave to such an amount that the wave cannot reach the receiver.
Created on Nov 12th 2020 04:53. Viewed 105 times.