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Directional Waverider MkIII

The Directional Waverider DWR-MkIII: Three years of continuous operation.

The Directional Waverider hardly needs any introduction: it is the world’s standard for measuring wave height and wave direction. Its success is due to the proprietary well-proven and accurate Datawell stabilized platform sensor, enabling wave height measurements by a single accelerometer. For the wave direction, direct pitch and roll measurements are performed needing no integration. In combination with horizontal accelerometers and a compass this forms the complete sensor unit, the heart of the instrument.

  • Sensor
    wave motion sensor based on a stabilised platform, accelerometers, and magnetic compass.
  • Measures
    – wave height for wave periods of 1.6 to 30 seconds, accuracy 0.5 % of measured value
    – wave direction
    – water temperature
  • Additional features
    – GPS for buoy monitoring and tracking through HF link
    – internal logger
    – power switch
    – LED flash antenna
    – Intelligent Test Box (only available for 90 cm buoys)
    – 0.9 m (0.7 m) diameter spherical hull of AISI 316
    – optional Cunifer hull, warranted not to corrode
    – 3.5 years (1.2 year) battery life
Resolution and Accuracy
Range: -20 m to +20 m, resolution: 0.01 m
Accuracy: < 0.5% of measured value after calibration
< 1.0% of measured value after 3 years
Period: 1.6 s to 30 s
Range: 0° to 360°, resolution 1.4° (1 binary degree)
Heading error: 0.4° to 2° (depending on latitude), typically 0.5°
Period: 1.6 s to 30 s (free floating)
Water temperature
Range: -5 °C to +46 °C, resolution 0.05 °C
Accuracy: < 0.1 °C (sensor accuracy)
Sensor and Processing
Type Datawell stabilized platform sensor, performing heave and direct pitch and roll measurements combined with a 3D fluxgate compass and X/Y accelerometers.
Sampling 8-channel, 14 bit @ 3.84 Hz
Processing 32 bits microprocessor system
Standard Features
Integrated datalogger Compact flash module 2 Gb
LED flashlight Antenna with integrated LED flasher, colour yellow (590 nm), standard length 35 cm, “Standard pattern”: 5 flashes every 20 s, “Increased pattern”: 5 flashes every 15 s.
GPS position 12 channel, fix every 30 minutes, precision < 5 m
Intelligent Test Box Enables sequential discharge of individual battery strings (0.9 m only)
Material Stainless steel AISI 316 or Cunifer 10
Hull diameter 0.7 m or 0.9 m (excluding fender)
Weight Approx 109 kg 0.7 m AISI 316, 113 kg 0.7 m Cunifer 10
Approx 216 kg 0.9 m AISI 316, 225 kg 0.9 m Cunifer 10
Batteries 0.7 m operational life 16 months, 1 section of 15 batteries
0.9 m operational life 49 months, 3 sections of 15 batteries
Type: Datacell RC27B (270 Wh black)
Power switch Data files are closed and secured
Temperature range Operating: -5 °C to +35 °C
Storage: -5 °C to +40 °C (+55 °C short term, weeks only)
Hull painting Brantho-Korrux “3 in 1” paint system (no anti-fouling)
Optional Features
Datawell HF link Frequency range 25.5 to 35.5 MHz (35.5 to 45.0 MHz on request).
Transmission range 50 km over sea, user replaceable.
For use with the Datawell RX-C or RX-D receiver.
Air temperature
Measuring height: 2 m above sea surface
Temperature range: -20 °C to +70 °C
Resolution: 0.01 °C
Exposed accuracy: ±0.5 °C (±1 °C when solar induced uncertainty detected)
Iridium / Argos Satellite communication
GSM Mobile communication
Solar power system Solar panel combined with BOOSTCAP capacitors
Radar reflectors Two reflectors mounted on hatchcover (retrofittable)
A picture of a CAT4 antenna with a background of the sea

Compact Air Temperature (CAT4)

The CAT4 is a meteorological air temperature sensor integrated in the HF-antenna of the Directional Waverider. It consists of four individual sensors that have different radiative properties and will therefore measure different temperatures. The actual air temperature is derived from these different temperatures. External influences that might affect the measurements, such as evaporative cooling, are detected for validation.

Software Waves5

Waves5 is Datawell’s newest Microsoft Windows based software package for data acquisition, processing, and display of wave data by Datawell Waveriders – directional and non-directional. Measuring oceanographic parameters does not solely involve gathering data and logging it. To get a complete view of the governing conditions at sea, it is desirable to post-process and present the data as well. The oceanographic parameters measured with a Waverider are made available to the user by data transfer like the HF-transmitter, GSM- and satellite links and data processing, storing and presentation software. The latter is taken care of by Waves5, the Microsoft Windows based software package developed by Datawell.
A picture of a Maximum Entropy Method directional spectrum in Waves5.


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