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  • Navis Autonomous Profiling Float NavisThe Navis aluminum hull has a smaller diameter and length than existing floats,providing a lightweight and cost-effective package that requires
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Navis Autonomous Profiling Float Navis SUMMARY • Sufficient power for 300 CTD profile cycles to 2000 dbars • SBE 41CP CTD; same CTD family as used on current Argo floats ◦ 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 FLOAT DESCRIPTION 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. The closed-loop, recirculating oil system utilizes a seamless natural rubber external bladder, and an oil reservoir filled to 300 ml (> 175 ml required for operation to 2000 dbars in Pacific Ocean). This system provides improved energy efficiency, better parking stability, and increased depth range over existing floats. Navis is self-ballasting, yielding reduced deployment preparation time. The Navis buoyancy engine is augmented at the sea surface by inflation of an air reservoir. This surface-following function provides 400 ml of 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, with a mean acquisition time of 70 seconds. It then transmits the acquired data via an Iridium Transceiver 9522B, with a nominal transmission time of 275 seconds for a 2000 dbar profile cycle (2 dbar bins of CTD data). 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. CTD DESCRIPTION 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. Sea-Bird Electronics, Inc. 13431 NE 20th Street, Bellevue, Washington 98005 USA Website: www.seabird.com Email: [email protected] Telephone: +1 425-643-9866 Fax: +1 425-643-9954

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Page 1: Navis Autonomous Profiling Float NavisThe Navis aluminum hull has a smaller diameter and length than existing floats,providing a lightweight and cost-effective package that requires

Navis Autonomous Profiling Float NavisSUMMARY

• Sufficientpowerfor300CTDprofilecyclesto2000dbars• SBE41CPCTD;sameCTDfamilyasusedoncurrentArgofloats◦ Pump-controlled,T-Cductedflowminimizessalinityspiking◦ Anti-foulantdevicesprovideeffectivebio-foulingprotection

• Iridiumcontinuous circuit switched, 2-way communications for low-costdownloadoflargeamountsofdata

• Self-ballasting,1daytoequilibrate;ballastingandsetupdoneatSea-Birdpriortoshipment

• Easy-to-use interface formissionprogramming, and for reprogrammingwhiledeployed

• Firmwarebasedonfield-provenArgofirmware• Lightweightandeasytodeploy(<18.5kg)• Expandableandscalabledesignforfuturemissions,suchasbiogeochemicalfloats,deepfloats

• Warranty—100profilesat100%ofpurchaseprice,pro-ratedthereafter

FLOAT DESCRIPTION

TheNavisfloathasatraditionallayout,withthesensorheadatthetop,andthebuoyancybladdersatthebottom.TheNavisbuoyancyengineusesapositivedisplacementpistonpumptotransfersiliconoilfrominternaltoexternalreservoirstoincreasethefloatvolumeandcauseittorise.Theclosed-loop, recirculating oil systemutilizes a seamless natural rubberexternalbladder,andanoilreservoirfilledto300ml(>175mlrequiredforoperationto2000dbarsinPacificOcean).Thissystemprovidesimprovedenergy efficiency, better parking stability, and increased depth rangeoverexistingfloats.Navisisself-ballasting,yieldingreduceddeploymentpreparationtime.

TheNavisbuoyancyengineisaugmentedattheseasurfacebyinflationofanairreservoir.Thissurface-following functionprovides400mlofexcessbuoyancytoimprovesurfacecommunications.Theopen-loopairbuoyancysystemusesaseamless,natural-rubber,externalbladderandoil-augmentedbladdercrushprevention.

At the surface,Navis uses aGarmin 15xL-WGPS to acquire positional information,with ameanacquisition timeof70 seconds. It then transmits the acquired data via an IridiumTransceiver 9522B,with a nominal transmission timeof275secondsfora2000dbarprofilecycle(2dbarbinsofCTDdata).TheIridiumantennaismountedontheCTDendcap,andissupportedbytheCTDcellguard.

TheNavisaluminumhull hasasmallerdiameterand length thanexistingfloats,providinga lightweightandcost-effectivepackagethatrequireslessenergytooperate.ThefloatispoweredbytwelvelithiumDDbatteriesinaSea-Birdbatterypack.Thebatterypackprovidessufficientpowerfor300CTDprofilecyclesto2000dbars.

CTD DESCRIPTION

TheSBE41CPCTDmeasurestemperature,conductivity,andpressurecontinuouslyat1Hzthroughascentandprovideshighaccuracy,resolution,andstability.Thepump-controlled,T-Cductedflowconfigurationminimizessalinityspikingcausedbymismatchoftemperatureandconductivitymeasurements.Thecarefullyengineeredanti-foulprotectionincludesanti-foulantdevices,aU-shapedflowpath,andanintegralpump.Onthefloat’sascent,asitapproaches10to5dbarsbeneaththeoceansurface,thepumpturnsoff.TheU-shapedflowpathpreventsseasurfaceoilsandcontaminantsfrombeingingestedwhileproceedingthroughtheoceansurfaceskinandsittingatthesurfaceduringdatatransmittal.Betweenprofiles,thepumpisoff.TheU-shapedflowpathpreventswaterflowthroughthesystemcausedbywavesorcurrents;minuteamountsofanti-foulantconcentrateinsidetheconductivitycelltominimizebio-fouling.

Sea-Bird Electronics, Inc. 13431NE20thStreet,Bellevue,Washington98005USAWebsite:www.seabird.com

Email:[email protected] Telephone:+1425-643-9866

Fax:+1425-643-9954

Page 2: Navis Autonomous Profiling Float NavisThe Navis aluminum hull has a smaller diameter and length than existing floats,providing a lightweight and cost-effective package that requires

SPECIFICATIONS

Science Data (SBE 41CP CTD) Initial Accuracy Stability

Temperature ±0.002°C 0.0002°C/year

Salinity ±0.002PSS-78 0.001PSS-78/year

Pressure ±2decibars 0.8decibars/year

Float OperationMinimumfractionalvolumechange 1.70%

Depthrating 2000decibars

Communications IridiumTransceiver9522B--RUDICS,circuitswitched.Nominaltransmissiontime275secfor2000dbarprofilecycle(2dbarbinsof1HzCTDdata)

Position GPS,Garmin15xL-W,meanacquisitiontime70sec

Parkinterval 1-15days

Materials Aluminumhull,seamlessnatural-rubberexternalbladders

Oilreservoir 300ml

Ballasting Self-ballasting,1daytoequilibrate

Weightinair Lessthan18.5kg

Box Stackable,export-compliant

Self-activation Startsoperatingautomaticallyondeployment,whenpressurereachesuser-programmablesetpoint

Internalbatteries 4packsof3DDlithiumsulfurylchloridecells(cannotshipinpassengeraircraft;Class9DangerousGoods).Eachpackhasopencircuitvoltageof10.8Vwith30AHcapacity,yielding1166kJ(4664kJfor4packs).

Powerconsumption 11kJfora2000-dbarCTDprofilecycle

Powerendurance 10yearsor3002000-dbarcycles

Memory CTDstoresone2000-dbarCTDprofile;Navisstores642000-dbarCTDprofiles

Dimensions Hulldiameter14cm(5.5inches),Ringdiameter24cm(9.5inches),Totallength159cm(62.7inches)

09/13

NavisNavis Autonomous Profiling Float

Sea-Bird Electronics, Inc. 13431NE20thStreet,Bellevue,Washington98005USAWebsite:www.seabird.com

Email:[email protected] Telephone:+1425-643-9866

Fax:+1425-643-9954


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