DFX Doppler Ultrasonic Flow Meter

The Dynasonics® DFX Doppler Ultrasonic flow meter measures the flow of aerated liquids or those containing suspended particles that reflect ultrasonic energy.

Size Range 6…3048 mm 1/4…120 in.
Temperature Range -40…200 °C -40…400 °F
Flow Range 0.05…9 m/s 0.15…30 fps
Accuracy ±2%



Simple Installation. Cost-Effective Solution.

The Dynasonics DFX Ultrasonic Doppler flow meter features a clamp-on design that streamlines installation and eliminates the worries of fluid compatibility and pressure head loss.

Streamline Installation. Because of its clamp-on design, the DFX Ultrasonic Doppler flow meter can be installed while operations run—there is no need to shut processes down or drain pipes.

Application Flexibility. Measures liquids containing suspended particles or aerated liquids, making it suitable for applications with sewage and mud slurries.

Simple Design. Does not have moving parts, which greatly reduces maintenance needs because there is nothing that will wear down over time.


• Clamp-on, non-invasive flow meter
• Bidirectional flow measurement system
• Measures flow rate, total and velocity of water flow
• Set up the meter through the keypad interface or with SoloCUE® Flow Device Manager software
• Compact enclosure uses a large, easy-to-read graphical display
• Modbus RTU or BACnet MS/TP over RS485 and BEACON®/AquaCUE® connectivity



• Minimal installation time: the DFX may be installed and fully operational within minutes. For most homogeneous pipe materials, there is no need to break into pipelines./p>

• Minimal material costs: clamp-on sensor eliminates the need for in-line flanges, pipe fittings, strainers, or filters.

• Reduced down-time: installation may be performed on full pipes and active systems. There is no need to shut down the process for installation or maintenance.

• Lower maintenance costs: with no moving parts, there is nothing on the DFX to wear down.



Successful application of Doppler ultrasonic flow meters relies on three physical constraints:
•The liquid flowing within the pipe must contain 100 ppm of useful sonic-suspended reflectors. Dissolved solids do not generate reflections and are not relevant.
• A significant portion of the ultrasound energy generated by the transducer must reach the sonic reflectors. The ultrasonic transducer must be acoustically coupled to the outside of a pipe (using grease or RTV couplant) and the pipe must permit ultrasound to pass without significant attenuation. Most pipes constructed of solid, homogenous materials meet this qualification. Pipes that cause application difficulty include concrete pressure pipes, woodstove pipes, Teflon® -lined pipes, and fiberglass-reinforced pipes.
• The pipe must be completely filled with liquid when measurements are made. The DFX microprocessor assumes that the pipe is completely full when it calculates the flow rate. The use of partially-filled pipes may result in inaccurate readings.


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