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ultrasonic Water level sensor

Hi Experts,

i search about design low cost ultrasonic based water level sensor, i am a newbie to this sensor design field so kindly suggest the best for my requirements

Measurement range- 5 Meters and 20 Meters, tank size, and tank structure is not fixed it will be varied based on places or users.

i want to use this transducer

the above link shows 4 sensors but i want to do with a single sensor.

regards 

Surya