Sound is very useful for measuring the flow rate of liquid flows, particularly ultrasound which has a frequency beyond the frequency range that the human ear can hear. A few ultrasonic flow measurement principles do exist, and as such an ultrasonic flow meter is very versatile. We can distinguish ultrasonic flow meters based on ultrasonic wave technology and the more conventional ultrasonic flow measuring principles like the Doppler effect and Transit time principle. Not all these measurement principles are suitable for low flows of pure liquids. Read more
