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Surface Velocity Radar for Measuring Open Channel Flow

OTT SVR 100 is a simple, non-contact, compact surface water velocity radar sensor. Designed for measuring flow in open channels and rivers where reliable velocity data is required continuously, during floods or periods of high concentrations of suspended sediments.

The sensor is mounted above the water surface, away from floating debris using a flexible bracket for vertical or horizontal installation. Velocity measurements and sensor status information from the integrated vibration and tilt sensor is available via SDI-12 over RS-485 and Modbus. It is also compatible with OTT Prodis 2 software for system calibration.

  • Fixed installation
  • Identify data influenced by sensor movement (e.g., wind, traffic) using meta data from integrated vibration and tilt sensors
  • Non-contact surface velocity radar
  • No
  • 0.08 ... 15 m/s (0.26 … 49 ft./s)
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Velocity Measurements:

  • Continuous non-contact surface velocity measurements during low, normal or high flows
  • Identify data influenced by sensor movement (e.g., wind, traffic) using meta data from integrated vibration and tilt sensors
  • Automatically detect flow direction
  • Eliminate/reduce effects of wind, precipitation, vibration, or waves by setting site specific filters

Installation / Maintenance:

  • Sensor unaffected by floating debris or suspended sediment by installing above the water surface
  • Flexible sensor mounting for quick installation on horizontal or vertical structures
  • Easily conceal sensor with compact size and flexible mounting options
  • Virtually maintenance free

System Integration / Compatibility:

  • Simple system integration, no deep knowledge required
  • Low power, ideal for powering with solar power
  • Easily integrate with new or existing systems using SDI-12 or RS-485 interface
  • Compatible with OTT Prodis 2 for system calibration

Open channels, including:

  • Rivers
  • Streams
  • Canals
  • Irrigation canals
  • Process water canals
  • Outlets / inlets

OTT SVR 100 Whitepaper

The OTT SVR 100 (Surface Velocity Radar) sensor was updated in 2020 and includes new benefits since then, like stronger compatibility with networks and more trust in data via several data quality indicators.

Our latest whitepaper takes a technical deep dive to showcase the technology that the OTT SVR 100 uses to collect measurements as well as verify their accuracy using QA/QC methods.

Learn more about:

  • Velocity measuring principle
  • Signal-to-noise ratio
  • Integrated weather and vibration filters

View our whitepaper today to see how the SVR 100 can integrate into your network to collect surface water velocity measurements.


Operating Instructions Surface Velocity Radar OTT SVR 100
OTT SVR 100 - Firmware - EN
OTT SVR 100 - Konformitätserklärung | Declaration of Conformity | Declaration de Conformité
OTT SVR 100 - Quick Start Guide
OTT SVR 100 Operating Program - EN
OTT SVR 100 Product Video
Prodis 2 - Application software - EN
Video - Webinar SVR 100 - EN
Whitepaper - OTT SVR 100: Surface Velocity Radar for Measuring Open Channel Flow
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Measurement device for Contactless velocity measurement
Measurement Range* 0.08 ... 15 m/s (0.26 … 49 ft./s)
* Depending on flow conditions
Resolution 0,1 mm/s , (0.0001 ft)
Accuracy ± 2% of measured value
Radar opening angle 12° Azimuth
24° Elevation
Detection distance 1 ... 50 m (3.3 … 164 ft.)
Distance to water 0.5 ... 25 m (1.64 … 82 ft.)
Radar frequency 24 GHz (K-band)
Serial Interfaces SDI-12, RS-232, RS-485
Protocols SDI-12, MODBUS
Power supply 9 ... 27 VDC
Power/current consumption
active typ. < 112 mA at 12 VDC
Maximum Current < 250 mA
(LxWxH) 134,5 x 114,5 x 80 mm (5.3 x 4.5 x 3.2 in) (without mounting bracket)
Housing ASA & Aluminium
Mounting 1.4301 (V2A)
Rotation range of swivel mount Lateral axis: ±90 °
Longitudinal axis: ±15 °
Cable length 10 m (32.8 ft)
with mounting bracket 820 g (1.81 lbs.)
without mounting bracket 1530 g (3.37 lbs.)
Temperature, in operation -40° ... +85°C (-40° … +185° F)
Housing IP 68
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