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OTT SLD – Side Looking Doppler Sensor

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OTT SLD – Side Looking Doppler Sensor

    • Equipped with two horizontal ultrasonic transducers “looking sideways” into the flow (Side Looking Doppler) to measure water velocity.
    • An optional vertical transducer and integrated pressure cell measures the water level.
    • All measurement values are analyzed, verified and processed by an integrated signal processor, before being used in the calculation of discharge.
    • Velocity measurements from up to nine cells are used, along with measured water level, to calculate discharge either internally in the OTT SLD or externally in a data logger.
    • All measurements can be retrieved using SDI-12, RS485 , RS232 or Modbus RTU protocols and are available for storing in a data collection platform, such as the OTT netDL station manager.
    • Reliable performance in waters with high sediment load and flood situations
    • Applicable in natural rivers, streams,  shipping-, irrigation- and service water canals
    • Also suitable for small waterbodies (smallest cell size 20 cm)

    Flow velocity measurement  
    Measuring range ±10 m/s
    Accuracy 1% of measured value ± 5 mm/s
    Number of measuring cells 9
    Cell size / Blanking  
    600 kHz 2 … 10 m / 0.5 … 30 m
    1.0 MHz 1 … 4 m / 0.3 … 15 m
    2.0 MHz 0.2 … 2 m / 0.1 … 8 m
    Beam angle / Max. profiling range*  
    600 kHz 2.4° / 80 m
    1.0 MHz 2.4° / 25 m
    2.0 MHz 2.1° / 10 m
    Minimum coverage 0.15 m (water level option)
    Electrical data  
    Supply voltage 12 … 16 V DC, typ. 12 V
    Power consumption 50 … 500 mW, depending on measurement cycle
    Water level measurement  
    (optional)  
    Measuring range 0.15 … 10 m
    Accuracy ±3 mm, depending on stratification
    Pressure cell (optional)  
    Measuring principle Piezo-resistive
    Measuring range 0 … 10 m
    Accuracy ±0.25 % FS
    Interfaces RS-232, SDI-12 or SDI-12 via RS-485, Modbus (optional)
    Environmental conditions  
    Operating temperature -5 … + 35 °C
    Storage temperature -20 … +70 °C
    Length x Ø 45 … 52.2 cm x 7.5 cm
    Housing material POM
    Wall bracket (accessory)  
    Components Bracket, protective cover, and C rail mount
    Material Stainless steel
    Details On request
    Discharge calculation Within the unit or externally on a data­logger, e.g. OTT netDL
    OTT SLD EasyUse Installation and service software System setup, commissioning, reviewing and optimizing
    OTT Prodis 2 (accessory) Calibration software Determining correction factors, (velocity-index method and others), optimizing discharge calculation, managing stations
    *The beam angle is understood to be the measured angle with regard to the main axis. The maximum profiling range depends on the water profile, salinity, suspended matter content etc.

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