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.
Highlights
Real-time current profiles and waves to 100 m range
Acoustic surface tracking (AST) with vertical beam
Can be used both with fixed frames and subsurface buoys
Applications
Online measurements of currents and waves
Design data for planning of new coastal structures
Site studies for offshore wind platforms
Coastal erosion studies
Measurement campaigns where the full wave spectrum is needed
Monitoring of transient waves for channel wall protection
Studies of tidal currents
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Water velocity measurements
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
Echo intensity (along slanted beams)
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°
Wave measurement option (AST)
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
Wave estimates
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
Sensors
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
Analog inputs
No. of channels
2
Supply voltage to analog output devices
Three options selectable through firmware commands: 1) Battery voltage/500 mA, 2) +5 V/250 mA, 3)+12 V/100 mA
Voltage input
0-5 V
Resolution
16-bit A/D
Data recording
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
Real-time clock
Accuracy
±1 min/year
Backup in absence of power
1 year
Data communications
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
Connectors
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
Software
Functions
Deployment planning, instrument configuration, data retrieval and conversion (for Windows®)
Power
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
Environmental
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
Materials
Standard model
Delrin® and polyurethane plastics with titanium screws
Dimensions
Maximum diameter
306 mm
Maximum length
203 mm
Weight
Weight in air
7.3 kg
Weight in water
3.6 kg
Online cable
Polyurethane jacket, Shore D hardness, 13 mm in diameter, max 2 km. Inquire for longer cables
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Technical drawings
AWAC 400KHz General Arrangement - NGA009-003 Rev.-
