MADD Technologies Sàrl - FLO-SONIC OCFM
Transit-Time Flowmeter
258 x 237 x 145 mm
2,5 kg
On demand


    The Flo-Sonic OCFM is a permanent flow measurement system for open channel applications using the ultrasonic transit time technology. It is designed to suit a large range of applications for clean to polluted water with very different flow conditions. The Flo-Sonic OCFM sensors are designed to be installed in channels and rivers with various shapes and dimensions with a maximum width of 15 meters for clean water applications.

    The Flo-Sonic OCFM system consists of one or more Flo-Sonic ultrasonic speed processors associated to one Unitrans flow processor and monitor and two Flo-Sonic probes per path.

    Very complex applications can be equipped with up to 16 measurement paths. The Flo-Sonic OCFM uses the very latest electronic technology combined with highly efficient digital signal processing (D.S.P.). The D.S.P. technique maximizes the system performance giving the user significant benefits.

    Operation principle:

    The Flo-Sonic measurement principle is based on detecting the transit time of ultrasonic signal between two sensors. The transit time with flow is shorter than the transit time against flow direction. The difference between these transit times is proportional the average flow velocity along the measurement path.

Technical specifications:

    Velocity Measurement

    Method:Ultrasonic Transit-Time
    Range:± 0,001 m/s to ± 10 m/s
    Bi-directional measurement
    Accuracy:± 1% of reading or 0,005 m/s (whatever is bigger)
    Repeatability:± 0,05%
    - Automatic control of ultrsonic signal using the ESC mode (Echo Shape Control)
    - Automatic zero flow adjustement with "anti bubble" signal processing
    - Echo analyzer with automatic control (ESC)
    - Dynamic Gain up to 89 dB.

    Flow Processor and Monitor

    UNITRANS flow monitor and processor combines up to 4 paths flow standard applications on request). For more technical information, please refer to the UNITRANS technical specification sheet.
    Multi-parameter display: Flow speed, gain, signal quality ratio.

    Data Storage

    1.000.000 measurements if used in combination with UNITRANS

    Local Terminal

    RS-232:Used in combination with PC software
    Keypad:For menu configuration (access code possible)


    Two 4-20mA outputs: System-isolated, up to 500 ohm load.

    Two OC contact closure for alarm (0.1 A @ 100 VDC).

    Power Requirements

    115-230 VAC, 50-60 Hz, max. 10 watts ; 12 VDC or 24 VDC (must be specified at time of ordering).

    Key Features

    • Easy and quick installation
    • High accuracy
    • User friendly operation
    • Automatic control of ultrasonic signal using the ESC mode (Echo Shape Control)
    • Automatic zero flow adjustment with "anti air bubble" signal processing
    • Robust, splashproof IP65 control unit enclosure
    • Compatible with 1MHz and 500 KHz probes
    • GPRS transmission combined with Unitrans flow monitor
    • ATEX certified sensors are available
    • Bi-directional measurement


    • Permanent measurement of surface water such as rivers, channels, streams, etc.
    • Inflow & outflow of cooling water or circulation systems
    • Wastewater treatment plants: inflow, outflow, discharge and other
    • Irrigation systems
    • Industrial wastewater channels/networks
    • Industrial process flow measurements
    • Climate & hydraulic engineering, network balancing
    • Measurements on storm water basin
    • Many others possible, contact our experts for more information


Manuel d'utilisation
Fiche technique
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MADD Technologies Sàrl
Avenue des Sports 42
1400 Yverdon-les-Bains

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