OTT HydroMet

- Model OTT SLD - Side-Looking Flow Doppler Sensor

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The OTT SLD is a measurement system for continuous measurement of water velocity and level in streams, rivers, and canals. The sensor employs the acoustic Doppler principle to reliably measure flow velocity in a variety of naturally occurring conditions, including during most flood events.

  • Fixed installation
  • Acoustic
  • Flow velocity
  • Side-Looking-Doppler for continuous discharge measurement in rivers and open channels. Discharge calculation based on velocity - index - method. Integrated vessel filter algorithm, Modbus interface and output of total volume of flow (max. interval 1 day).
  • ± 10 m/s
  • ± 1 % of measured value ± 0.5 cm/s

  • 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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