Ultrasonic Flowmeter

Dual Sensors and Flow DC Functionality Reduces Inlet Runs to only 2D

Clamp-on Ultrasonic Flowmeters are already well proven for measuring and managing water flows in power plants and hydro power stations, in the water and wastewater industry, and for utilities in food and beverage. But even in basic and standard applications, requirements are growing steadily due to process automation demands. The Endress+Hauser Prosonic Flow W 400 therefore combines proven ultrasonic measurement technology with the advantages of Endress+Hauser’s Proline device series, thus meeting the requirements of plant operators with regards to cost efficiency, comprehensive process monitoring and maximum freedom when planning measuring points.


  • Non-intrusive flow measurement without maintenance. Directly mounted on the exterior wall of the pipe without opening the pipe
  • For the measurement of numerous fluids, e.g. in the fields of water/wastewater, power/energy plants, utilities, etc.
  • Very large nominal diameter range: DN 15 to 4000 (½ to 160″)
  • Suitable for pipes made of metal, plastic, GRP or composite materials with or without lining
  • Time-saving on-site operation and simplified installation thanks to the integrated web server (without additional software/hardware)
  • Heartbeat Technology for device verification during operation without process interruption

The clamp-on design enables safe measurement of even corrosive, abrasive and toxic fluids – regardless of conductivity or pressure. That makes Prosonic Flow W 400 ideal for monitoring and controlling numerous processes: quantity and volume measurement, totalising and balancing, verification of previously installed flowmeters and detection of leaks in a pipeline.

Unique FlowDC Function for Maximum Performance with Disturbed Flow

When using two sets of sensors the Prosonic Flow W 400 can be ordered optionally with the unique FlowDC function that detects and compensates for effects of flow disturbance, for example downstream of pipe bends. This makes it possible to maintain a consistent accuracy even with a significant reduction in inlet runs, going from the standard 15 pipe diameters all the way down to only 2 pipe diameters.

Ultrasonic Flowmeter Function

         Minimum inlet and outlet run requirements with various flow obstructions using the FlowDC function

This means maximum flexibility for planners and users, should they want to equip or retrofit a plant with clamp-on flowmeters or even verify existing flow meters without disturbing the process and where pipe inlet runs are restricted.

Fits on Any Pipe

Prosonic Flow W 400 can be mounted on a wide variety of pipelines. A maintenance-free coupling pad provides optimum sound transmission between sensor and pipe. The resulting constant, high signal strength ensures stable measurement results over many years. Depending on the line size, fluid and pipe material, the sensors are delivered with different ultrasonic frequencies (0.3, 0.5, 1.0, 2.0 and 5.0 MHz) so that users can fully rely on maximum signal quality, accuracy and repeatability.

Download the Prosonic Flow W 400 innovation brochure at https://portal.endress.com/dla/5001133/6307/000/00/IN01184DEN_0121.pdf or get in touch with us at EMC to see how we can help you with all your flow measurement requirements.