OTT Sonicflow

Travel time differential approach for precise flow velocities

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The OTT Sonicflow using the ultrasonic travel time principle is designed for continuous discharge measurements in rivers, canals and streams. Thanks to up-to-date ultrasonic technology and smart signal processing, the rugged measuring system provides precise values even in shallow waters. It can be used for waters between 5 m and 200 m in width.

  • Fixed installation
  • Acoustic
  • Flow velocity
  • Ultrasonic travel time system for rivers from 5 to 200 m width. Required minimum water level of 16 cm. Very low power consumption. Robust and flexible transducer mounting structures. Compatible with OTT data logger.
  • ± 10 m/s
  • ± 1 % of measured value ± 2 mm/s


Compact, modular system design: allows for individual configuration according to type of water and requirements
Rugged transducer support: optimum protection and precise sensor alignment

  • Only little sensor coverage necessary: can also be used in shallow water
  • Intuitive calibration software: professional calibration of the measuring system as well as easy-to-use management of measuring cross-section and system parameters
  • Low power consumption: optional battery or solar operation

Examples of Use

Continuous discharge measurement in open channels and canals, also in shallow, wide waters, tidal areas, estuaries (backwater, changes in direction of flow)

  • Reliable discharge control in cooling water canals, e.g. in power stations
  • Precise control of tidal gates, sluices, dams, sample collectors etc.
  • Precise flow measurement for controlling irrigation canals


Brochure – OTT Discharge – Stationary measurement systems
Leaflet – Ultrasonic system for continuous discharge measurement in flowing waters OTT Sonicflow
Prodis 2 – Application software


Technical Data

Flow velocity Measurement
Principle Ultrasonic travel time principle
Measuring range ±10 m/s
Accuracy 1% of measured value ±2 mm/s *
* for a single-path standard installation with path length of 100 m and path angle of 45°
Measuring paths
Number 1 … 8
Path lenght 14 … 300 m
River width 5 … 200 m
Ultrasonic transducer frequency 250 kHz (Band width 50%)
Power supply 9 … 15 V DC (typ. 12V)
Power concumption 300 mA (active); 0.1 mA (stand-by)

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