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can the piezo transducer be used irrespective of the size of pipes to make it work as water flow sensor? Answered

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. As a rule of thumb, the further the signal has to travel, the larger the transducer. I've used clamp-on ultrasonic flow meters that used the same transducers for, IIRC, 1-4" steel pipe.

put a transducer against the pipe and strap it on with a metal band... might work if it was sensitive enough...