Signature55 2
Signature55 1
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Nortek People Signature55 55K Hz Shipping
Nortek People Signature55 55K Hz Testing 1
Signature55 2
Signature55 1
Signature55 3
Nortek People Signature55 55K Hz Shipping
Nortek People Signature55 55K Hz Testing 1

Ocean currents


> 1000 m current profiling range for stand-alone and online applications


The Signature55 ADCP is a current profiler that combines an ultralong range with a compact layout. Novel ADCP transducer design allows 1000 m profiles concurrent with slightly shorter-range, finer resolution measurements using two different frequencies in the same instrument. The more than 90% lower power consumption (compared to similar ADCPs) also permits long-duration deployments operating on internal batteries only.

  • Currents


  • > 1000 m current profiling range
  • Stand-alone and online applications
  • Concurrent high-resolution and long-range measurements


  • Observing deep-ocean current profiles
  • Current measurements for deep-water meteorological buoys
  • Fine and coarse deep-water current profiles


The Signature Deployment software guides users through setup to ensure all measurement schemes are handled correctly and makes certain all users can fully utilize the capabilities of the long-range ADCP.


The Signature55 offers dependable buoy and bottom frame setups from Nortek and leading industry partners tailored for the instrument. Up to 90% lower power consumption compared to similar ADCPs means this low-power, long-range ADCP can operate on internal batteries alone during long deployments.


Ethernet and serial communications options make both online and stand-alone applications possible. Ocean Contour is a powerful postprocessing software created specifically for the AD2CP platform.

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Maximum profiling range* 1000 m (55 kHz), 600+ (75 kHz)
Cell size 5-20 m
Minimum blanking 2 m
Maximum number of cells 200
Velocity range (along beam) User-selectable 1 or 5.0 m/s
Minimum accuracy 1% of measured value ± 0.5 cm/s
Velocity precision Broadband processing, consult instrument software
Velocity resolution 0.1 cm/s
Max sampling rate 1 Hz (1/3 Hz at max power)
* Maximum range depends on transmit power and acoustic scattering conditions

Velocity range N/A
Cell size N/A
Profiling range N/A
Range velocity limitations N/A

Single Average
Concurrent N/A
Alternate Single (coarse/fine)
* US Patent 8223588

Sampling Same as velocity
Resolution/ dynamic range 0.5 dB / 70 dB
Transducer acoustic frequency 55 and 75 kHz
Number of beams 3, slanted at 20°
Beam width 4.5°-5.5°

Resolution N/A
Number of bins N/A
Transmit pulse length N/A
Transmit pulse N/A
Resolution / dynamic range N/A

AST frequency N/A
AST max distance N/A
Maximum wave measurement depth N/A
Height range N/A
Accuracy/resolution (Hs) N/A
Accuracy/resolution (Dir) N/A
Period range N/A
Cut-off period (Hs) N/A
Cut-off period (dir) N/A
Sampling rate (velocity and AST) N/A

Parameters N/A

Temperature: Thermistor in head (sampled at meas. rate)
Temp. range -4 to +40 °C
Temp. accuracy/resolution 0.1 °C/0.01 °C
Temp. Time response 2 min
Compass: Solid State magnetometer (max 1 Hz sample rate)
Accuracy/resolution 2° for tilt < 30°/0.01°
Tilt: Solid State accelerometer (max 1 Hz sample rate)
Accuracy/resolution 0.2° for tilt < 30°/0.01°
Maximum tilt Full 3D
Up or Down Automatic detect
Pressure: Piezoresistive (sampled at meas. rate)
Standard range 0-1500 m (inquire for options)
Accuracy/precision 0.1% FS / Better than 0.002% of full scale

Accelerometer dynamic range ± 2 g
Gyro dynamic range ± 250°/sec
Magnetometer dynamic range ± 1.3 Gauss
Pitch and roll range / resolution ± 90° (pitch) ± 180° (roll) /0.01°
Pitch and roll accuracy ± 2° (dynamic)*, ± 0.5° (static, ±30°)
Heading range / resolution 360°, all axis /0.01°
Heading accuracy ± 3° (dynamic)*, ± 2° (static, tilt < 20°)
Sampling rate Same as measurement rate (up to 1 Hz)
* Dynamic specifications depends on the type of motion

Capacity 16 GB, 64 GB or 128 GB (inquire for larger capacity)
Data record Consult instrument software
Mode Stop when full

Accuracy ± 1 min/year
Clock retention in absence of external power 1 year. Rechargeable backup battery.

Ethernet 10/100 Mbits Auto MDI-X, TCP/IP, UDP/IP, HTTP protocols, Fixed IP / DHCP client /Auto IP address assignment, UPnP and Nortek proprietary instrument discovery over Ethernet
Serial Configurable RS-232/RS-422 300-1250000 bps
Recorder download baud rate 20 Mbit/s (Ethernet only) - 1 GB in 6 minutes
Controller interface ASCII command interface over Telnet and serial

Depending on configuration MCBH6F (Ethernet), MCBH8F (serial), MCBH2F-G2 (pwr), optional Souriau M-series metal connector for online use (14M)

Functions Deployment planning, instrument configuration, data retrieval and conversion (for Windows®)

DC input 15-48 V DC
Maximum peak current 1.5 A
Max. average consumption at 1 Hz 15 W
Typical average consumption* 2 W
Sleep consumption 100 μA, power depending on supply voltage
Transmit power per beam 4-250 W, adjustable levels
Ping sequence Multiplexing or parallel
* 10 min. avg. profile, 1 cm/sec hor. Prec., Max cell size, max power, long range mode. Consult SW for other configurations

Internal One or two 540 Wh alkaline or 1800 Wh lithium
Duration Depending on configuration, consult software

Operating temperature -4 to +40 °C
Storage temperature -20 to +60 °C
Vibration IEC60068-2-64
EMC approval IEC/EN 61000-6-2, 61000-6-3
Depth rating 1500 m

Standard model POM with titanium fasteners. Reinforced polyurethane transducer cups

Maximum diameter 648 mm
Maximum length with room for internal batteries 547 mm (1 battery), 747 mm (2 batteries)
Maximum length without room for internal batteries 314 mm

In air, no battery 65.5 kg
In water, no battery 25.1 kg
Battery 10.0 kg (2 x 540 Wh), 5.8 kg (2 x 1800 Wh)

Signature 55 On-Line General Arrangement - NGA061-004 Rev.-
Signature 55 Stand-Alone- General Arrangement - NGA061-005 Rev.A

Declaration of conformity
Pressure test cerifications
Statement of compliance
Vibration test


3x55 kHz transducer head

Long (for two internal batteries or one battery and DSL)

Medium (for one internal battery or DSL modem)

Short (no internal batteries or DSL modem)

16 GB SD card data logger

64 GB

Pressure sensor, 0-100 m, 0,1%

Pressure sensor, 0-1000m, accuracy 0,1% of FS

Pressure sensor, 0-1500m, accuracy 0,1%

10m Ethernet cable with MCIL6MP, Power/RJ45 at dry end

10-100m Ethernet cable (specify length in comments field) with MCIL6MP-PWR/RJ45

10m Serial RS232 cable, MCIL8MP-DB12

10m Serial RS232 cable, MCIL8MP-DB9 w/RS485 trigger

Serial RS422 cable >10m (specify length in comments field), MCIL8MP-DB9

Online cable, Souriau 10M open ended, (specify length in comments field)

Online cable, Souriau 10M PWR/RJ45, max 100m, (specify length in comments field)

Compass and tilt sensor


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