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Radar Flow measurement

The Raven-Eye is the new non-contact RADAR area/velocity flow meter for open channel
flow measurements from Flow-Tronic. It combines state of the art non-contact measuring
technology which measures flow from above the water surface with easy integration into
existing SCADA or telemetry systems.

Radar area/velocity flow sensors have been in use for many years, so why is the Raven-Eye
so revolutionary? Using the latest design, development and production methods, has
allowed Flow-Tronic to manufacture a high quality new generation radar sensor at a price
that will make it your first choice for open channel and sewer flow measurement,
but affordability is only one of the Raven-Eye’s benefits.

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نصب فلومتر تماسی

                  نصب فلومتر غیر تماسی

How does it work

The Raven-Eye is mounted above the water surface and measures the flow

عملکرد فلومتر راداری

velocity using the radar technology and the flow depth using a level sensor (ultrasonic, radar or pressure).

The flow rate is calculated applying the continuity equation:
Q = V x A

The Raven-Eye will function even when obscured by plastic and wood. During each measurement cycle, it makes thousands of velocity measurements which are processed into an extremely accurate average velocity measurement reading using a dedicated digital signal processor making real-time spectral analysis.


  • Accurate flow measurement
  • Cost-effective
  • Portable or stationary version available
  • Non-contact: the sensor is positioned above the water surface
  • Easy installation
  • Robust IP68 (PU) enclosure
  • Totally sealed sensor: no joints, seals or screws
  • Developed for field applications
  • Velocity distribution analysis & self-learning technology for average velocity calculation
  • For channels from 100 mm and upwards
  • Easy integration with SCADA, PLC or telemetry systems
  • Direct RS485 interface available (no monitor or converter necessary)
  • One 4-20 mA configurable output
  • Perfect solution for difficult flow conditions: high solids content, high temperature, shallow and caustic flows, high velocities and large open channels
  • No maintenance
  • Auto-diagnostic system

The name was not chosen at random, like the bird, the Raven-Eye has three key attributes:
Intelligence, Adaptability, Survivability.

Firstly, Intelligence: The sensor uses radar to measure surface velocity, average velocity is calculated within the sensor by analyzing surface velocity distribution using a self-learning technology that doesn’t require theoretical modules nor site calibration. Negative effects from non-ideal flow conditions, waves, turbulence etc. are removed. The Raven-Eye is not a piece of “laboratory” equipment; it’s a fully developed system, designed for use in real world applications.

Next, Adaptability: The Raven-Eye can be used in almost any open channel location, from 10 cm upwards, with velocities from 0,15 m/s to 9 m/s. It’s ideal for retrofitting and industry standard MODBUS and analogue outputs allow easy integration with existing SCADA, PLC and telemetry networks. The Raven-Eye can also operate as a standalone system with flow and diagnostic displays, data logging and web data transfer.

Finally, Survivability: The Raven-Eye builds on years of experience measuring sewer flows, the sensor is totally sealed, no joints, seals, screws or washers are used. It’s rated to IP68 which means it withstands surcharge events and aggressive atmospheres. Internal sensors monitor and report the condition or “health” of the system.

The combination of these benefits and virtually zero maintenance requirements,
give the user a very low “Cost of Ownership”.



نصب فلومتر رادار روی کانال

Wastewater Treatment Plants

  • Flow to treatment
  • Discharge
  • Plant effluent
  • Storm discharge
  • Process flow control

نمونه نصب فلومتر رادار

Sewer/Channel Networks Monitoring

  • Large sewer channels
  • Capacity studies
  • Combined sewer overflow (CSO) studies
  • Inflow & infiltrations studies
  • High velocity flows
  • Discharge

فلومتر رادارنصب بر روی رودخانه

Rivers, Channels & Irrigation

  • Storm water monitoring & compliance
  • Climate & hydraulic engineering
  • Storm water basins calculations
  • Permanent measurements of surface water

فلومتر رادار روی لوله سرریز

Industry & Hydropower

  • Plant effluent
  • Process waste water
  • Flows with high solid contents
  • Cooling water
  • Industrial compliance monitoring
  • Caustic & corrosive flows

 Technical specifications

General: Size (HxWxL): 183 x 140 x 422 mm Vertical blocking when mounted: 300 mm  
            Weight : 3,85 kg (without cable, level sensor and mounting accessories)
Materials : Enclosure: Polyurethane (PU), stainless steel Cable: Polyurethane jacketed
Cable Lengths: 10, 20, 30 or length as needed up to 300 m
Protection: IP68
Certifications: CE
Temperature Range: Operating: -20 to 50 °C Storage: -30 to 60 °C
Power Required: Input voltage: 4 to 26 VDC
Outputs: 1 passive analog 4-20 mA (velocity only)
Communication: RS-485 (serial MODBUS ASCII open protocol) for use with PLCs RS-485 (proprietary protocol) for use with Unitrans or RTQ-Logger series Field interchangeable: Automatic recognition between stationary or portable units
Flow Accuracy: ±5% of reading (typical)

Flow Measurement: Method: Conversion from surface velocity to average velocity by analyzing surface velocity distribution using a self-learning 
technology that doesn’t require theoretical modules nor site calibration.
                                                      Conversion of water level and pipe size to fluid area. Multiplication of fluid area by average velocity to obtain the flow rate.

Velocity Measurement Method: Non-Contact Radar Doppler
Measurement Range: ±0,15 m/s to ±9 m/s
Measurement: Bi-directional
Accuracy: ±0.5% of reading ±zero stability
Zero Stability:n±0,02 m/s
Minimum Velocity: 0,15 m/s

Optional Combined Level Measurement (Ultrasonic) Technology: Non-Contact Ultrasonic Pulsed Echo 
Measurement Range: 0,00 to 1,75 m (with RAV-0001)
                                                                                                                                                             0,00 to 5,75 m (with RAV-0002) 
Accuracy: ±1% of reading ± zero stability
Zero Stability: ±2 mm
Resolution: 1 mm

Optional Combined Level Measurement (Radar) Method: Non-Contact Pulsed Radar
Range: 0,01 to 15 m
Accuracy: ±2 mm of reading
Resolution: 1 mm

Optional Separate Level Measurement Method:Any 4-20 mA loop powered sensor

Flow-Tronic , Belgium
Pulsar , UK
SAIV A/S, Norway
Isoil Industria, Italy
Toscano , Spain
Micronics , UK

Non-Contact Radar Flow Measurement
Electromagnetic Flowmeters
Ultrasonic Flowmeters(Transit time)
Ultrasonic Flowmeters( Doppler )
Open Channel Measurement
Level Measurement
Pressure Measurement /Pressure Logger
Ultrasond Alga Cleaner

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