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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
  • 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

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.

 


Documents
Brochure
Manual
Additional
Related Categories
Dataloggers
Aqualab Systems
Water Level Sensors