Water Flow

OTT

SLD

The sensor employs the acoustic Doppler principle to reliably measure flow velocity in a variety of naturally occurring conditions, including during most flood events.

Usage Type: Fixed installation
Measurement technology: Acoustic
Parameters measured: Flow velocity
Product Highlights: 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).
Measurement range: ± 10 m/s
Accuracy: ± 1 % of measured value ± 0.5 cm/s

FEATURES

Features:

  • 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.
Specs

• Specifications

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
Measuring range (optional) 0.15 … 10 m
Accuracy ±3 mm, depending on stratification
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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