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Navis BGC Autonomous Profiling Float
with Biogeochemical Sensors

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Navis Autonomous Profiling Float with Biogeochemical Sensors SUMMARY


A Navis autonomous profiling float with integrated optical Dissolved Oxygen sensor (SBE 63) and bolt-on WET Labs ECO Triplet 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 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.

For detailed information on the operation of the Navis float, see the Navis float datasheet.

Navis BGC Float Deployment in the Mediterranean (photo by Christoph Gerigk © Sea-Bird Electronics)

(photo by Christoph Gerigk
© Sea-Bird Electronics)



Volume change: 1.7% (minimum fractional)

Depth rating: 2000 decibars

Communications: Iridium Transceiver 9523 -- RUDICS, circuit switched. Nominal transmission time 275 sec for 2000 dbar profile cycle (2 dbar bins of 1 Hz data)

Position: GPS, Garmin 15xL-W, mean acquisition time 20 sec

Park interval: 1 - 15 days

Materials: Aluminum hull, seamless natural rubber external bladders

Oil reservoir: 300 ml

Ballasting: Self-ballasting, 1 day to equilibrate

Weight in air: Less than 20 kg

Box: Stackable, export-compliant

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). Each pack has 10.8 V open circuit voltage & 30 AH capacity; 1166 kJ (4664 kJ/4 packs).

Power consumption: 13 kJ for a 2000-dbar profile cycle

Power endurance: 250 2000-dbar cycles

Memory: CTD stores one 2000 decibar profile

Dimensions: Hull diameter 14 cm (5.5 inches), Ring diameter 24 cm (9.5 inches), Total length 167 cm (65.7 inches)


Documentation -- manual, photos, technical papers, application notes, etc.

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Specifications are subject to change without notice.

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