An Ultrasonic gas meter uses sound waves to determine the speed at which a fluid flows through a pipe. Under non-flowing conditions, the frequency of the ultrasonic wave transmitted into the pipe is the same as the frequency it reflects from the fluid. Under flow conditions, the frequency of the ref

An Ultrasonic gas meter uses sound waves to determine the speed at which a fluid flows through a pipe. Under non-flowing conditions, the frequency of the ultrasonic wave transmitted into the pipe is the same as the frequency it reflects from the fluid. Under flow conditions, the frequency of the ref