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The Navis float has a traditional layout, with the sensor head at the top, and the buoyancy bladders at the bottom. The Navis buoyancy engine uses a positive displacement piston pump to transfer silicon oil from internal to external reservoirs to increase the float volume and cause it to rise. This system provides improved energy efficiency, better parking stability, and increased depth range over existing floats.
The Navis buoyancy engine is augmented at the sea surface by inflation of an air reservoir. This surface-following function provides excess buoyancy to improve surface communications. The open-loop air buoyancy system uses a seamless, natural-rubber, external bladder and oil-augmented bladder crush prevention.
At the surface, Navis uses a Garmin 15xL-W GPS to acquire positional information. It then transmits the acquired data via an Iridium Transceiver 9523. The Iridium antenna is mounted on the CTD end cap, and is supported by the CTD cell guard.
The Navis aluminum hull has a smaller diameter and length than existing floats, providing a lightweight and cost-effective package that requires less energy to operate. The float is powered by twelve lithium DD batteries in a Sea-Bird battery pack. The battery pack provides sufficient power for 300 CTD profile cycles to 2000 dbars.
Navis
WET Labs
www.seabird.com [email protected] +1 425-643-9866
• Sufficient power for 300 CTD profile cycles to 2000 dbars.• SBE 41CP CTD; Argo standard.
- Pump-controlled, T-C ducted flow minimizes salinity spiking. - Anti-foulant devices provide effective bio-fouling protection.
• Iridium continuous circuit switched, 2-way communications for low-cost download of large amounts of data.
• Self-ballasting, 1 day to equilibrate; ballasting and setup done at Sea-Bird prior to shipment.
• Easy-to-use interface for mission programming, and for reprogramming while deployed.
• Firmware based on field-proven Argo firmware.• Lightweight and easy to deploy (< 18.5 kg).• Expandable and scalable design for future missions, such as biogeochemical floats,
deep floats.• Warranty — 100 profiles at 100% of purchase price, pro-rated thereafter.
Features
Autonomous Profiling Float
Sea-Bird Electronics +1 425-643-9866
Specifications subject to change without notice. ©2014 Sea-Bird Scientific. All rights reserved. Rev. October 2014
Science Data (SBE 41CP CTD)
Temperature Initial accuracy ± 0.002 °C; Stability 0.0002 °C/year
Salinity Initial accuracy ± 0.002 PSS-78; Stability 0.001 PSS-78/year
Pressure Initial accuracy ± 2 decibars; Stability 0.8 decibars/year
Navis
Float OperationDepth Rating 2000 decibars
Communications Iridium Transceiver 9523 — RUDICS, circuit switched
Position GPS, Garmin 15xL-W
Park Interval 1 - 15 days
Materials Aluminum hull, seamless natural-rubber external bladders
Ballasting Self-ballasting, 1 day to equilibrate
Weight in air Less than 18.5 kg
Self-Activation Starts operating automatically on deployment, when pressure reaches user-programmable setpoint
Internal batteries 4 packs of 3 DD lithium sulfuryl chloride cells (cannot ship in passenger aircraft; Class 9 Dangerous Goods).
Power Endurance 10 years or 300 2000-dbar cycles
Memory CTD stores one 2000-dbar CTD profile; Navis stores 64 2000-dbar CTD profiles
Dimensions Hull diameter 14 cm, Ring diameter 24 cm, Total length 159 cm
CTD Operation
The SBE 41CP CTD measures temperature, conductivity, and pressure continuously at 1 Hz through ascent and provides high accuracy, resolution, and stability. The pump-controlled, T-C ducted flow configuration minimizes salinity spiking caused by mismatch of temperature and conductivity measurements. The carefully engineered anti-foul protection includes anti-foulant devices, a U-shaped flow path, and an integral pump. On the float’s ascent, as it approaches 10 to 5 dbars beneath the ocean surface, the pump turns off. The U-shaped flow path prevents sea surface oils and contaminants from being ingested while proceeding through the ocean surface skin and sitting at the surface during data transmittal. Between profiles, the pump is off. The U-shaped flow path prevents water flow through the system caused by waves or currents; minute amounts of anti-foulant concentrate inside the conductivity cell to minimize bio-fouling.
The Navis BGCi autonomous profiling float with integrated optical Dissolved Oxygen sensor (SBE 63) and WET Labs ECO-MCOMS is now available from Sea-Bird Scientific. The sensors take continuous measurements at 1 Hz through ascent, and provide high accuracy, resolution, and stability.
• The SBE 41N CTD measures conductivity, temperature, and pressure (depth). The pump-controlled, T-C ducted flow minimizes salinity spiking caused by mismatch of temperature and conductivity measurements.
• The individually calibrated SBE 63 Optical Dissolved Oxygen sensor is integrated within the CTD flow path, providing optimal correlation with CTD measurements.
• The ECO-MCOMS uses demonstrated WET Labs technology to supply three optical sensors in one, providing chlorophyll a, backscattering, and CDOM, or chlorophyll a and 2 backscattering channels. MCOMS is integrated directly into the float end cap and co-located with DO and physical measurements.
As an option, multiple sensors can be attached to the float hull and cabled to the end cap. Data from all sensors, including the optional bolt-on sensors, is integrated in the data stream by the SBE 41N CTD electronics. Available bolt-on sensors include the Satlantic Deep SUNA (nitrate), Satlantic OCR 504 (4-channel radiometer), and WET Labs C-Rover 2000 (transmissometer).
Navis BGCi
WET Labs
www.seabird.com [email protected] +1 425-643-9866
• Navis Autonomous Profiling Float.• SBE 63 Optical Dissolved Oxygen sensor.• WET Labs ECO-MCOMS fluorometer / backscattering sensor.• Up to four optional bolt-on sensors.• SBE 41N CTD — integrated data stream for all sensors on float, and continuous
profiling from 2000 dbars; same CTD family as current Argo floats.• Flexible mission sequencing, allowing more frequent sampling in upper water column.• Backed by Sea-Bird Scientific warranty.
Features
Autonomous Profiling Float with integrated Biogeochemical Sensors
Closeup of Navis BGCi Head
Sea-Bird Electronics +1 425-643-9866
Specifications subject to change without notice. ©2014 Sea-Bird Scientific. All rights reserved. Rev. October 2014
Initial AccuracyTemperature ± 0.002 °C
Salinity ± 0.002 PSS-78
Pressure ± 2 decibars
Dissolved Oxygen ± 3 µmol/kg or ± 2%
Chlorophyll Fluorescence
± 0.2% of full scale (relative to specific monoculture of phyto-plankton [diatom] grown in specific light/nutrient conditions)
CDOM Fluorescence ± 0.3% of full scale (relative to Quinine sulfate dihydrate)
Backscattering ± 0.2% of full scale (relative to polystyrene beads [2 µm ±0.1 µm mean diameter]
Navis BGCi
Volume Change 1.7% (minimum fractional)
Depth Rating 2000 dbars
Communications Iridium Transceiver 9523 — RUDICS, circuit switched
Position GPS, Garmin 15xL-W, mean acquisition time 70 sec
Park Interval 1 - 15 days
Materials Aluminum hull, seamless natural rubber external bladders
Weight (in air) < 20 kg (excluding optional bolt-on sensors)
Self-Activation Starts operating automatically on deployment, when pressure reaches user-programmable setpoint
Internal Batteries 4 packs of 3 DD lithium sulfuryl chloride cells
Power Endurance 250 2000-dbar cycles (mission dependent; excluding optional bolt-on sensors)
Memory CTD stores one 2000-dbar profile
Dimensions Hull diameter 14 cm, ring diameter 24 cm, total length 167 cm
Typical StabilityTemperature 0.0002 °C/year
Salinity 0.001 PSS-78/year
Pressure 0.8 decibars/year
Dissolved Oxygen <1 µmol/kg/100,000 samples (20 °C; sample-based drift)
Navis BioGeoChemical Float Deployment
in the Mediterranean (Photo by Christoph Gerigk,
© Sea-Bird Electronics)
Now available with a deep, stable pH sensor, the Navis BGCi + pH introduces the Float Deep SeaFET™ to the community for autonomous profiling float missions. The Float Deep SeaFET™ is integrated into the SBE 41N profiling float CTD data stream. This float also integrates the Float Deep SeaFET™ into the SBE 41N pumped flow path for bio-fouling protection.
The SBE 41N CTD measures conductivity, temperature, and pressure (depth). The SBE 41N manages the installed sensors to take continuous measurements at 1 Hz through ascent, and provide high accuracy, resolution, and stability data. The pump-controlled, T-C ducted flow minimizes salinity spiking caused by mismatch of temperature and conductivity measurements.
The individually calibrated SBE 63 Optical Dissolved Oxygen sensor is integrated within the CTD flow path, providing optimal correlation with CTD measurements.
The ECO-MCOMS uses demonstrated WET Labs technology to supply three optical sensors in one, providing chlorophyll a, backscattering, and CDOM, or chlorophyll a and 2 backscattering channels. ECO-MCOMS is integrated directly into the float end cap and co-located with DO and physical measurements.
The Float Deep SeaFET™ is an adaptation of the Deep-Sea DuraFET developed collaboratively by the Monterey Bay Aquarium Research Institute (MBARI), Scripps Institution of Oceanography (SIO), and Honeywell. The Deep Sea DuraFET technology was developed by Ken Johnson at MBARI and Todd Martz at SIO.
Navis BGCi + pH
WET Labs
www.seabird.com [email protected] +1 425-643-9866
• Navis Autonomous Profiling Float.• SBE 63 Optical Dissolved Oxygen sensor.• WET Labs ECO-MCOMS fluorometer / backscattering sensor. • Float Deep SeaFET™.• SBE 41N CTD — integrated data stream for all sensors on float, and continuous
profiling from 2000 dbars; same CTD family as current Argo floats.• Additional bolt-on sensors available.• Flexible mission sequencing, allowing more frequent sampling in upper water column.• Backed by Sea-Bird Scientific warranty.
Features
Autonomous Profiling Float with integrated Biogeochemical Sensors
Closeup of Navis BGCi +pH Head
Navis BGCi +pH Float with
optional Satlantic Deep SUNA
sensor
Sea-Bird Electronics +1 425-643-9866
Specifications subject to change without notice. ©2014 Sea-Bird Scientific. All rights reserved. Rev. August 2015
Initial AccuracypH ± 0.02 pH
Temperature ± 0.002 °C
Salinity ± 0.002 PSS-78
Pressure ± 2 decibars
Dissolved Oxygen ± 3 µmol/kg or ± 2%
Chlorophyll Fluorescence
± 0.2% of full scale (relative to specific monoculture of phytoplankton [diatom] grown in specific light/nutrient conditions)
CDOM Fluorescence ± 0.3% of full scale (relative to Quinine sulfate dihydrate)
Backscattering ± 0.2% of full scale (relative to polystyrene beads [2 µm ±0.1 µm mean diameter]
Navis BGCi + pH
Volume Change 1.7% (minimum fractional)
Depth Rating 2000 dbars
Communications Iridium Transceiver 9523 — RUDICS, circuit switched
Position GPS, Garmin 15xL-W, mean acquisition time 70 sec
Park Interval 1 - 15 days
Materials Aluminum hull, seamless natural rubber external bladders
Weight (in air) < 20 kg (excluding optional bolt-on sensors)
Self-Activation Starts operating automatically on deployment, when pressure reaches user-programmable setpoint
Internal Batteries 4 packs of 3 DD lithium sulfuryl chloride cells (cannot ship in passenger aircraft; Class 9 Dangerous Goods)
Power Endurance 220 2000-dbar cycles (mission dependent; excluding optional bolt-on sensors)
Memory CTD stores one 2000-dbar profile
Dimensions Hull diameter 14 cm, ring diameter 24 cm, total length 167 cm
Typical StabilitypH 0.036 pH/year
Temperature 0.0002 °C/year
Salinity 0.001 PSS-78/year
Pressure 0.8 decibars/year
Dissolved Oxygen <1 µmol/kg/100,000 samples (20 °C; sample-based drift)
Dan Schuller of Scripps Institution of Oceanography deploys a SOCCOM float on
cruise of R/V Polarstern from Cape Town, South Africa to
Neumayer Station Antarctica, December 2014
(Photo by Hannah Zanowski, Princeton University)
Closeup of Float Deep SeaFETTM
pH Sensor Probe Assembly
