Aperçu
The AWAC 400 kHz ADCP has become the standard reference technology in submerged wave-measurement applications. Thousands of these ADCPs have been deployed to capture the full wave spectrum, in combination with current profiles. With a 100 m maximum range for wave measurements and 1.5 Hz sampling of the surface elevation, the AWAC 400 kHz is the optimal tool for deeper-water current and wave measurements.
- Currents
- Waves
Points forts
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Real-time current profiles and waves to 100 m range
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Acoustic surface tracking (AST) with vertical beam
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Can be used both with fixed frames and subsurface buoys
Utilisation
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Online measurements of currents and waves
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Design data for planning of new coastal structures
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Site studies for offshore wind platforms
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Coastal erosion studies
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Measurement campaigns where the full wave spectrum is needed
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Monitoring of transient waves for channel wall protection
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Studies of tidal currents
Setup
Designed for straightforward and reliable current and wave measurements in up to 100m of water, the AWAC 400kHz is configured using the AWAC deployment software before installation. The 400kHz AWAC’s wave measurement range is the longest of the AWAC family.
Deployment
AWACs are often bottom-mounted and/or implemented as part of real-time wave monitoring systems. Leading industry partners offer bespoke frames and buoys for the AWAC.
Data
Optional onboard wave processing allows real-time streaming of wave parameters to users onshore. Nortek’s SUV processing method (exclusive to AWACs and Signatures) enables quality wave measurements from a moving subsurface buoy. Nortek postprocessing software and/or display software is available for review or visualization of data, after deployment or in real time.
Maximum profiling range |
100 m |
Cell size |
1.0-8.0 m |
Number of cells |
Typical 20-40, max. 128 |
Velocity range |
±10 m/s horizontal, ±5 m/s along beam |
Accuracy |
±1% of measured value ±0.5 cm/s |
Velocity precision |
Consult instrument software |
Maximum output rate |
1 Hz |
Internal sampling rate |
2 Hz |
Sampling |
Same as velocity |
Resolution |
0.45 dB |
Dynamic range |
90 dB |
Transducer acoustic frequency |
400 kHz, 600 kHz for vertical beam |
Number of beams |
3 beams 120° apart, one vertical beam, (90° apart, one at 5° for platform mount) |
Beam width |
2.4° |
Beam width vertical beam |
1.7° |
Maximum depth |
100 m |
Data types |
Pressure, one velocity along each beam, AST |
Sampling rate velocity (output) |
0.75 Hz |
Sampling rate AST (output) |
1.5 Hz |
No. of samples per burst |
512, 1024 or 2048 |
Range |
-15 to 15 m |
Accuracy/resolution (Hs) |
< 1% of measured value / 1 cm |
Accuracy/resolution (Dir) |
2° / 0.1° |
Period range |
1-50 s |
Cut-off period (Hs) |
20 m depth: 0.9 sec, 60 m depth: 1.5 sec, 100 m depth: 2 sec |
Cut-off period (dir) |
20 m depth: 3.1 sec, 60 m depth: 5.5 sec, 100 m depth: 7.1 sec |
Temperature: |
Thermistor embedded in housing |
Temp. range |
-4 to +40 °C |
Temp. accuracy/resolution |
0.1 °C/0.01 °C |
Temp. time response |
< 5 min |
Compass: |
Magnetoresistive |
Accuracy/resolution |
2°/0.1° for tilt < 15° |
Tilt: |
Liquid level |
Accuracy/resolution |
0.2°/0.1° |
Maximum tilt |
30°, AST requires < 10° instrument tilt |
Up or Down |
Automatic detect |
Pressure: |
Piezoresistive |
Range |
100 m |
Accuracy |
0.5% of full scale (optional 0.1% of full scale) |
Resolution |
0.005% of full scale |
Capacity |
9 MB standard, 4/16 GB (ProLog) |
Profile record |
Ncells*9 + 120 bytes |
Wave record |
Nsamples*24 + 1k bytes |
Mode |
Stop when full (default and Prolog) or wrap mode |
Accuracy |
±1 min/year |
Backup in absence of power |
1 year |
I/O |
RS-232 or RS-422. Software supports most commercially available USB– RS-232 converters |
Communication baud rate |
300-115200 Bd |
Recorder download baud rate |
600/1200 kBd for both RS-232 and RS-422 |
User control |
Handled via ”AWAC AST” software, or ActiveX®controls. ”Seastate” for online systems |
Output formats |
NMEA, Binary. Prolog provides same types also for processed wave and current data |
Bulkhead |
MCBH-2-FS, MCBH-8-FS, optional Souriau M-series metal connector for online use |
Cable |
PMCIL-8-MP on 10 m polyurethane cable |
Functions |
Deployment planning, instrument configuration, data retrieval and conversion (for Windows®) |
DC input |
9-18 V DC |
Maximum peak current |
3 A |
Avg. power consumption |
0.23 W |
Sleep current |
< 100 μA |
Transmit Power |
1-30 W, 3 adjustable levels |
Operating temperature |
-4 to +40 °C |
Storage temperature |
-20 to +60 °C |
Shock and vibration |
IEC 721-3-2 |
EMC approval |
IEC 61000 |
Depth rating |
300 m |
Standard model |
Delrin® and polyurethane plastics with titanium screws |
Maximum diameter |
306 mm |
Maximum length |
203 mm |
Weight in air |
7.3 kg |
Weight in water |
3.6 kg |
Polyurethane jacket, Shore D hardness, 13 mm in diameter, max 2 km. Inquire for longer cables |
External |
540Wh (alkaline) or 1800 W (lithium) |
Battery, 18 V - 540 Wh, alkaline
The standard battery for instruments in the Signature series.
Battery pack, 10-pack, 18 V - 540 Wh, alkaline
The standard battery for instruments in the Signature series.
Battery pack, 5-pack, 18 V - 540 Wh, alkaline
The standard battery for instruments in the Signature series.
Battery, 19 V - 1800 Wh, lithium
An optional high-capacity lithium battery for instruments in the Signature series.
Cable, 10 m Ethernet cable with 6-pin
Cable, 10 m Serial cable with 8-pin w/RS485 trigger
Battery canister, aluminium for 2*36*D pack w/cable to Signature 2-pin Inline (500m rating)
Battery canister, aluminium for 2*36*D pack w/cable to Signature 2-pin Inline (500m rating)
Battery canister, aluminium for 36*D pack w/cable to Signature 2-pin Inline (500m rating)
