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Picture of ultrasonic flowmeter Proline Prosonic Flow W 400 (9W4B)

Proline Prosonic Flow W 400 ultrasonic flowmeter

Clamp-on flowmeter for the water and wastewater industry and for utilities: flexible, easy to install and safe

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  • Measuring principle

    Ultrasonic flow

  • Product headline

    Clamp-on meter with Heartbeat Technology and web server for the water and wastewater industry.
    Short inlet run thanks to FlowDC.
    Bidirectional measurement for water and wastewater as well as process water and hydropower plants.

  • Sensor features

    Low capital investment – cost-effectiveness increases with pipe diameter (up to DN 4000/156"). Long-term stable signal – maintenance-free permanent mounting from outside with coupling pads. Reliable measurement on various pipe materials – sensor for GRP and plastic pipes available.
    Mounting without process interruption. Wide nominal diameter range: DN 15 to 4000 (½ to 160"). Medium temperature up to +130 °C (+266 °F).

  • Transmitter features

    Safe operation – no need to open the device due to display with touch control, background lighting. Full remote access – web server. Integrated diagnostics, verification and monitoring – Heartbeat Technology.
    Transmitter housing made of durable polycarbonate or aluminium. Remote version for wall mounting. Integrated data logger: measured values monitoring.

  • Nominal diameter range

    DN15 to 4000 (1/2 to 160")

  • Sensor materials

    Clamp on system:
    Sensor holder 1.4301 (304), 1.4404 (316L)
    Sensor housing 1.4301 (304), 1.4404 (316L)
    Strapping bands 1.4301 (304), 1.4404 (316L)

  • Measured variables

    Volume flow, Flow velocity, Sound velocity

  • Max. measurement error

    Volume flow:
    ±3% o.r. for DN15
    ±2% o.r. for DN25 to 200
    ±2% o.r. above DN200

  • Measuring range

    0 to 15 m/s (0 to 50 ft/s)

  • Max. process pressure


  • Medium temperature range

    –40 to +130 °C (–40 to +266 °F)

  • Ambient temperature range

    Sensor DN 15 to 65: -40 to 130°C
    Sensor DN 50 to 4000: -40 to 130°C

  • Sensor housing material


  • Transmitter housing material

    Wall-mounted housing
    Polycarbonat; AlSi10Mg, coated

  • Degree of protection

    Transmitter: IP66/67, Type 4X enclosure
    Sensor: IP66/67, Type 4X enclosure, IP68, Type 6P enclosure (optional)

  • Display/Operation

    4‐line backlit display with touch control (operation from outside)
    Configuration via local display, web browser and operating tools possible

  • Outputs

    3 ouputs:
    4‐20 mA/4‐20 mA HART (active)
    Pulse/frequency/switch output (passive)
    Pulse/frequency/switch output (passive)

  • Inputs

    Status input

  • Digital communication


  • Power supply

    AC 100 to 240 V / AC/DC 24 V

  • Approvals


  • Other approvals and certificates

    Other approvals and certificates

  • Product safety

    CE, C-tick marking, EAC-marking

  • Metrological approvals and certificates

    Flowmeter verification for all frequencies except 0.3 MHz, reference line size: 5 MHz DN 50, all other frequencies DN 100
    Verification performed on accredited calibration facilities (acc. to ISO/IEC 17025)
    Heartbeat Technology complies with the requirements for measurement traceability according to ISO 9001:2015 – Section a

  • Marine approvals and certificates

    Marine approvals and certificates