Ultrasonic waves transmit upstream and downstream through the pipe wall and the liquid flowing within. By measuring the difference in travel time and knowing the pipe size, the meter determines velocity and flow rate.
Transit time ultrasonic flow meters use two transducers, which mount to the outside of the pipe and function as ultrasonic transmitters and receivers. The flow meters operate by alternately transmitting and receiving a frequency-modulated burst of sound energy between the transducers.
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