Ultrasonic flow meter - General Guidance - Arduino Forum

There is an old saying do not put the cart before the horse. In your case you are doing about the same thing, it appears you have the parts looking for a project.

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Hint: Sound travels at a different rate through different media. Environmental impact on the sensor is critical. the SR04s do not like liquids.

I think that the HC-SR04 will only tell you the distance to the pipe.

The HC-SR04 has transmit and receive transducers facing in the same direction.
For an ultrasonic flow meter you would want the transducers facing each other.

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The HC-SR04 has an IC specifically programmed to emit a burst of ultrasonic and measure the time until a reflection is received.

To make an ultrasonic flow meter, you need to transmit an ultrasonic signal at a known frequency, and measure the frequency difference between the transmitted and received frequency.

the ultrasonic frequency used in hc sr04 id of 40khz what is the frequency which is used in commerically available clamp on flow meters also can you please send me link of article with which i can learn exactly how can we design an ultrasonic sensor as that of in the commercially available flow meters
Thanks a lot everyone

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