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SBE 61 Deep Argo CTD

The SBE 61 Deep Argo CTD is designed for deployments to 7000 m on Argo floats.

The SBE 61 Deep Argo CTD is a redesign of the SBE 41/41CP designed for deployments to 7000 m, with improved overall measurement quality and stability to meet the needs of deep ocean research. Each SBE 61 is chosen from an extended calibration history, ensuring stable electronics and minimal drift in the field. The hardware interface and many commands have been carried over to make integration into existing SBE 41/41CP-based products easier.

FEATURES

  • Proven MicroCAT Temperature, Conductivity, and Pressure sensors with improved electronics provide stability for multi-year deployments
  • Isolated conductivity cell for improved stability
  • Long-term factory calibrations ensure higher accuracy with minimal drift
  • Pump-controlled TC-Ducted flow over the temperature and conductivity sensor minimizes salinity spiking
  • U-shaped flow path prevents ingesion of surface contaminants
  • Carefully engineered anti-foul protection extends deployment duration
  • RS-232 and Hardware Sampling Interface available

COMPONENTS

  • Internal-field conductivity cell permits use of TC Duct and minimizes noise
  • Aged and pressure-protected thermistor has a long history of exceptional accuracy and stability.
  • 7000 m Kistler Pressure sensor with 4-point temperature compensation
  • Continuous pump
  • Titanium housing

Measurement Range

Conductivity 0 to 9 S/m
Temperature -5 to 35 °C
Pressure 0 to 7000 meters

 

Initial Accuracy

Conductivity ± 0.0002 S/m
Temperature ± 0.001 °C
Pressure ± 4.5 dbar / 7000 meters

 

Typical Stability

Conductivity 0.002 S/m over 10 years
Temperature 0.0002 °C per year
Pressure 0.8 dbar / year

 

Resolution

Conductivity 0.00005 S/m
Temperature 0.0001 °C
Pressure 0.002% of Full scale range

 

Miscellaneous

Power Consumption (12 V) Idle: 8-10 mA
Sleep: 10 μA
Profiling: 20 mA
External Power 8 - 14 VDC
Housing, Depth Rating, & Weight Titanium, 7000 m, 2.8 kg in air

 

 

The list below includes (as applicable) the current product brochure, manual, and quick guide; software manual(s); and application notes.

 

Compare Profiling CTDs (Conductivity, Temperature, and Pressure)

SBE Sampling Rate Channels for Auxiliary Sensors Memory Power Real-Time Data Comments
Internal External
SBE 911plus CTD (9plus CTD & 11plus Deck Unit) 24 Hz

8 A/D

16 Mb with optional SBE 17plus V2
(with optional SBE 17plus V2)
World's most accurate, high resolution CTD, premium sensors, multi-parameter support, water sampler control.
SBE 25plus Sealogger CTD 16 Hz 8 A/D;
2 RS-232
2 Gb
May require SBE 36 CTD Deck Unit & PDIM
High-resolution logging CTD with multi-parameter support. Water sampler control with SBE 33 Carousel Deck Unit.
SBE 25 Sealogger CTD
8 Hz 7 A/D 8 Mb
May require SBE 36 CTD Deck Unit & PDIM
Replaced by SBE 25plus in 2012. Water sampler control with SBE 33 Carousel Deck Unit.
SBE 19plus V2 SeaCAT Profiler CTD 4 Hz 6 A/D;
1 RS-232
64 Mb
May require SBE 36 CTD Deck Unit & PDIM
Personal CTD, small, self-contained, adequate resolution. Water sampler control with SBE 33 Carousel Deck Unit.
SBE 19plus SeaCAT Profiler CTD
4 Hz 4 A/D; optional PAR 8 Mb
May require SBE 36 CTD Deck Unit & PDIM
Replaced by SBE 19plus V2 in 2008. Water sampler control with SBE 33 Carousel Deck Unit.
SBE 19 SeaCAT Profiler CTD
2 Hz 4 A/D 1 - 8 Mb
May require SBE 36 CTD Deck Unit & PDIM
Replaced by SBE 19plus in 2001. Water sampler control with SBE 33 Carousel Deck Unit.
SBE 49 FastCAT CTD Sensor 16 Hz      
May require SBE 36 CTD Deck Unit & PDIM
For towed vehicle, ROV, AUV, or other autonomous profiling applications. Water sampler control with SBE 33 Carousel Deck Unit.
SBE 52-MP Moored Profiler CTD & (optional) Dissolved Oxygen Sensor 1 Hz 1 frequency channel for dissolved oxygen sensor 28,000 samples   Intended for moored profiling applications on device that is winched up and down from a buoy or bottom-mounted platform.
SBE 41/41CP CTD Module for Autonomous Profiling Floats (Argo) OEM CTD for sub-surface oceanographic float that surfaces at regular intervals, transmits new drift position and in situ measurements to ARGOS satellite system. CTD obtains latest temperature and salinity profile for transmission on each ascent. Also available is a Navis Autonomous Profiling Float, Navis BGCi Autonomous Profiling Float with Integrated Biogeochemical Sensors, and Navis BGCi + pH Autonomous Profiling Float with Integrated Biogeochemical Sensors
Glider Payload CTD (GPCTD) and Slocum Glider Payload CTD OEM CTD for autonomous gliders. Generic Glider Payload CTD (GPCTD) is modular, low-power profiling instrument that measures C, T, P, and (optional) Dissolved Oxygen. Slocum Glider Payload CTD provides retrofit/replacement for CTDs on Slocum gliders. Designs share many features, but there are differences in packaging, sampling abilities, power consumption, and installation (see individual data sheets).
Notes:
1. See Application Note 82: Guide to Specifying a CTD.
2. products are no longer in production. Follow the links above to the product page to retrieve manuals and application notes for these older products.