navis autonomous profiling float navisthe navis aluminum hull has a smaller diameter and length than...

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:seabird@seabird.com Telephone:+1425-643-9866

Fax:+1425-643-9954

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:seabird@seabird.com Telephone:+1425-643-9866

Fax:+1425-643-9954