Try searching by key words, order- or product code or serial number e.g. “CM442” or “Technical information”
Enter at least 2 characters to start the search.
Picture of ultrasonic flowmeter Proline Prosonic Flow 91W for water and wastewater applications

Proline Prosonic Flow 91W
ultrasonic flowmeter

Device with automatic frequency scan for max. measuring performance and cost-effective transmitter

Please Wait (spinning wheel)
Loading price
Prices temporarily unavailable
Price on request
activating price
price: provide information
from CHF ??.-
Filter Measuring / Application task
Measuring / Application task

Configure to download the CAD drawings of this product

  • Measuring principle

    Ultrasonic flow

  • Product headline

    Device with automatic frequency scan for maximum measuring performance and cost-effective transmitter.
    Clamp-on flow measurement of process water, salt water, demineralized water, drinking & wastewater.

  • Sensor features

    Low capital investment – cost-effectiveness increases with pipe diameter (up to DN 2000/80"). Long-term stable signal – maintenance-free permanent mounting from outside with coupling pads. Process transparency – diagnostic capability.
    Medium temperature: –20 to +80 °C (-4 to +176 °F). Degree of protection IP68 (Type 6P enclosure) for pipes under water. Shock and vibration resistance according to IEC 68-2-6.

  • Transmitter features

    Economical transmitter – designed for easy applications. Fast and reliable commissioning – Quick Setup menu for installation. Automatic recovery of data for servicing.
    Aluminium field transmitter housing. 2-line display with push buttons. HART.

  • Nominal diameter range

    Single channel, 1 or 2 paths : DN15 to 2000 (1/2 to 80")

  • Wetted materials

    Clamp on system:
    Sensor holder 1.4308/CF-8
    Sensor housing 1.4301/304
    Strapping bands 1.4301/304

  • Measured variables

    Volume flow, sound velocity, flow velocity, signal strength, totalizer

  • Max. measurement error

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

  • Measuring range

    0.3 to 10 m/s (1 to 33 ft/s)

  • Max. process pressure


  • Medium temperature range

    -20 to +80°C (-4 to +176 °F)
    0 to +130°C (32 to +265 °F) option

  • Ambient temperature range

    -20 to +60 °C (-4 to +140 °F)

  • Sensor housing material


  • Transmitter housing material

    AlSi10Mg, coated

  • Degree of protection

    IP67, type 4X for transmitter
    IP67 type 4X for sensors
    IP68 type 6P for sensors (option). IP67 NEMA 4X

  • Display/Operation

    2 lines backlit display with 3 push button

  • Outputs

    1x 4-20 mA HART (active)
    1x Pulse/frequency/switch output (passive)

  • Inputs


  • Digital communication


  • Power supply

    AC 85 to 250 V
    20 to 28 V
    DC 11 to 40 V

  • Hazardous area approvals

    Non hazardous area
    FM, CSA

  • Other approvals and certificates

    Flowmeter verification for DN15, 25, 40, 50 & 100 only
    EAC marking

  • Product safety

    CE, C-Tick, EAC marking

  • Metrological approvals and certificates

    Flowmeter verification for DN15, 25, 40, 50 & 100 only