OTT HydroMet - Model SLD - Side-Looking Flow Doppler Sensor
From Water Flow
Water flow meter for longterm data collection of velocity and discharge measurements. 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.
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Product Details
- 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
Advantages
- 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.
Example of Use
- 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)
Technical Specification
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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