Kongsberg Simrad ST90 User manual

kongsberg.com/simrad
Simrad ST90
TECHNICAL
SPECIFICATIONS

110-0035138/A
April2023©KongsbergMaritimeAS
PUBLIC
SimradST90
Fish-ndingsonar
Technicalspecications
Thepurposeofthispublicationistopresentthetechnicalspecications
relatedtotheSimradST90system.Thesetechnicalspecications
summarizethemainfunctionalandoperationalcharacteristicsofthe
ST90Fish-ndingsonar.Theyalsoprovideinformationrelatedto
powerrequirements,physicalpropertiesandenvironmentalconditions.
AtKongsbergMaritime,wearecontinuouslyworkingtoimprovethe
qualityandperformanceofourproducts.Thetechnicalspecications
maybechangedwithoutpriornotice.
Caution
YoumustneverpermittheST90systemtotransmit(ping)whenthe
shipisinadrydock.Thetransducercanbedamagedifittransmits
intheopenair.
Additionalend-userdocumentsrelatedtotheST90systemcanbe
foundonourwebsite.Thisincludespublicationsthataretranslated
intootherlanguages.SelectedpublicationsarealsoprovidedinIETM
(InteractiveElectronicTechnicalManual)formats.
•https://www.kongsberg.com/st90

KongsbergMaritimeAS
www.kongsberg.com
Documentinformation
•Product:SimradST90
•Document:Technicalspecications
•Documentpartnumber:110-0035138
•Revision:A
•Dateofissue:17April2023
Copyright
TheinformationcontainedinthisdocumentremainsthesolepropertyofKongsbergMaritimeAS.No
partofthisdocumentmaybecopiedorreproducedinanyformorbyanymeans,andtheinformation
containedwithinitisnottobecommunicatedtoathirdparty,withoutthepriorwrittenconsentof
KongsbergMaritimeAS.
Warning
Theequipmenttowhichthismanualappliesmustonlybeusedforthepurposeforwhichitwas
designed.Improperuseormaintenancemaycausedamagetotheequipmentand/orinjurytopersonnel.
Youmustbefamiliarwiththecontentsoftheappropriatemanualsbeforeattemptingtooperate
orworkontheequipment.
KongsbergMaritimedisclaimsanyresponsibilityfordamageorinjurycausedbyimproperinstallation,
useormaintenanceoftheequipment.
Disclaimer
KongsbergMaritimeASendeavourstoensurethatallinformationinthisdocumentiscorrectandfairly
stated,butdoesnotacceptliabilityforanyerrorsoromissions.
Supportinformation
Ifyourequiremaintenanceorrepair,contactyourlocaldealer.Youcanalsocontactususingthe
followingaddress:[email protected].Ifyouneedinformationaboutourotherproducts,visit
https://www.kongsberg.com/simrad.Onthiswebsiteyouwillalsondalistofourdealersanddistributors.

110-0035138/A3
Tableofcontents
SIMRADST90..........................................................................7
Important............................................................................................................................8
Systemdescription...........................................................................................................10
Systemdiagram................................................................................................................12
Systemunits.....................................................................................................................13
Displaydescription.................................................................................................13
ProcessorUnitdescription......................................................................................14
TransceiverUnitdescription..................................................................................15
HullUnitdescription..............................................................................................16
Transducerdescription...........................................................................................17
Installationtrunkdescription..................................................................................19
Additionalrequiredandoptionalitems............................................................................20
Installationtrunkrequirement................................................................................20
Speedlogrequirement............................................................................................21
Coursegyrorequirement........................................................................................21
Uninterruptiblepowersupply(UPS)requirement.................................................21
OperatingPaneloption...........................................................................................22
Globalpositioningsystem(GPS)option................................................................22
Scopeofsupply................................................................................................................23
Orderinformation............................................................................................................24
Generalsafetyrules..........................................................................................................25
Installationrequirements..................................................................................................27
Supplyvoltagerequirements..................................................................................27
Uninterruptiblepowersupply(UPS)requirements................................................27
Cablesandwiringrequirements.............................................................................28
Compassdeviationrequirements............................................................................28
Noisesources..........................................................................................................28
Drydockingrequirements......................................................................................29
Requirementforclassicationapproval.................................................................29
Networksecurity..............................................................................................................29
Supportinformation.........................................................................................................30
TECHNICALSPECIFICATIONS................................................33
Introductiontotechnicalspecications...........................................................................34
Performancespecications..............................................................................................34
Powerrequirements.........................................................................................................38
Displaypowerrequirements...................................................................................38
OperatingPanelpowerrequirements(Mk1)..........................................................38
Technicalspecications

4110-0035138/A
OperatingPanelpowerrequirements(Mk2)..........................................................39
OperatingPanelpowerrequirements(Mk3)..........................................................39
TransceiverUnitpowerrequirements....................................................................39
HullUnitpowerrequirements................................................................................40
Weightsandoutlinedimensions......................................................................................41
Displayweightandoutlinedimensions..................................................................41
EnixProcessorUnitweightandoutlinedimensions..............................................41
OperatingPanelweightandoutlinedimensions(Mk1).........................................42
OperatingPanelweightandoutlinedimensions(Mk2).........................................42
OperatingPanelweightandoutlinedimensions(Mk3).........................................42
TransceiverUnitweightandoutlinedimensions...................................................43
HullUnitweightandoutlinedimensions...............................................................43
Environmentalrequirements............................................................................................45
Displayenvironmentalrequirements......................................................................45
EnixProcessorUnitenvironmentalrequirements..................................................45
OperatingPanelenvironmentalrequirements(Mk1).............................................46
OperatingPanelenvironmentalrequirements(Mk2).............................................46
OperatingPanelenvironmentalrequirements(Mk3).............................................46
TransceiverUnitenvironmentalrequirements.......................................................47
HullUnitenvironmentalrequirements...................................................................47
Compasssafedistance.....................................................................................................48
Displaycompasssafedistance...............................................................................48
ProcessorUnitcompasssafedistance....................................................................48
OperatingPanelcompasssafedistance(Mk1).......................................................48
OperatingPanelcompasssafedistance(Mk2).......................................................49
OperatingPanelcompasssafedistance(Mk3).......................................................49
TransceiverUnitcompasssafedistance.................................................................49
HullUnitcompasssafedistance............................................................................49
Minimumdisplayrequirements.......................................................................................50
DRAWINGFILE......................................................................51
Aboutthedrawingsinthedrawingle............................................................................52
385609ProcessorUnitoutlinedimensionsEnix.............................................................53
494024ProcessorUnitoutlinedimensions(HT20470/DC)............................................57
494025ProcessorUnitoutlinedimensions(HT20470/AC)............................................60
204688OperatingPaneldimensions(Mk1)....................................................................63
443179OperatingPaneldimensions(Mk2)....................................................................65
440689OperatingPanelcut‑outdrawing(Mk2).............................................................68
439594OperatingPaneladapterplate(Mk2)..................................................................69
476352OperatingPaneldimensions(Mk3)....................................................................71
489582Transceiverdimensions(Mk2)...........................................................................74
SimradST90

110-0035138/A5
381457Transceiverdimensions(Mk1/Old)....................................................................77
447567HullUnitdimensionsST92................................................................................80
435546HullUnitdimensionsST93................................................................................83
447545HullUnitdimensionsST94................................................................................86
436691Installationtrunkdimensions..............................................................................89
207485Blindangedimensions(ø760mm)...................................................................92
439413Installationtrunkextender(350mm).................................................................93
374676Installationtrunkextender(180mm).................................................................96
082973MountingangeDN500.....................................................................................99
083045GatevalveinstallationDN500..........................................................................102
33498GatevalvedimensionsDN500...........................................................................104
37357GatevalvedimensionsDN500...........................................................................107
DATAGRAMFORMATS..........................................................110
Technicalspecications

6110-0035138/A
SimradST90

110-0035138/A7
SimradST90
Topics
Important,page8
Systemdescription,page10
Systemdiagram,page12
Systemunits,page13
Additionalrequiredandoptionalitems,page20
Scopeofsupply,page23
Orderinformation,page24
Generalsafetyrules,page25
Installationrequirements,page27
Networksecurity,page29
Supportinformation,page30
SimradST90

8110-0035138/A
Important
TheST90isanadvancedproduct.Itisusedwithotheradvancedproducts.Thereis
importantinformationthatyouneedtoknow.
Watertightintegrity
Thesize,locationanddesignofthesonarroommustfullalltherequirementstothe
vessel’swatertightintegrity.
Intheeventofamajorleak,itmustbepossibletocloseallwatertighthatchesand/or
doorstotheroomtomaintainvesselstabilityandsafety.Thephysicalsizeofthesonar
roommustbelimited,sothatintheeventofamajorleak,theoodingoftheroomwill
notinduceinstability,orcausethevesseltocapsizeorsink.
Formoreinformation,seeSonarroomrequirements.
Mechanicalsupportoftheinstallationtrunk
Theinstallationtrunkmustbesecuredtothebulkheadsand/orthehullbymeansof
strengtheningplates(stiffereners).Thedimensionsandstrengthoftheplatesmustbe
adequatetopreventanyvibrations.Thisisaninvariablerequirementtoensurethe
safetyoftheST90systemandthevessel.
Theshapeandlocationsofthestrengtheningplatesmustbedeterminedbythe
installationshipyardbasedonthephysicalpropertiesoftheinstallationtrunk,the
hullandthespaceavailable.Minimumfourstrengtheningplatesmustbeused.Each
strengtheningplatemustextendallthewayfromthebottomtothetopoftheinstallation
trunk.Onlyleaveasmallgaptoallowaccesstotheboltsandnutsusedtosecurethe
mountingange.Theminimumplatethicknessis10mm,buttheclassicationsociety
canspecifyotherdimensions.
Mechanicalsupportofthehullunitgantry
Thehullunitgantrymustbesecuredtothebulkheadbymeansofmechanicalsupport
brackets.Thedimensionsandstrengthofthesupportbracketsmustbeadequateto
preventvortexinducedvibrations.Thisisaninvariablerequirementtoensurethesafety
oftheST90systemandthevessel.
Werecommendthatsupportbracketsareplacedpointingatminimumthreedirections
withapproximately120degreesbetweenthem.
Themechanicalsupportbracketsmustbedesignedandmanufacturedbytheinstallation
shipyardtotthecompleteinstallationinthesonarroom.Allcalculationsmadeto
supportthedesignmustmeettheapplicablesafetyrequirements,andapplytothe
physicalpropertiesofthecompleteinstallation.
BeforeyouturnontheST90system
BeforeyouturnontheST90system,makesurethatyouhavesufcientwaterdepth
tolowerthetransducer!
SimradST90Technicalspecications

110-0035138/A9
Caution
YoumustneverturnontheST90systemwhentheshipisindrydock.Thetransducer
canbedamagedifittransmitsintheopenair.
WhentheST90systemisnotused
WhenyoudonotusetheST90system,turnitoff.
Note
YoumustneverturnofftheST90systembymeansoftheon/offswitchontheProcessor
Unit.YoumustALWAYSusetheOperatingPanel.
Whenyouaredockingyourvessel
YoumustneversettheST90systemtonormaloperationwhentheshipisindrydock.
Thetransducercanbedamagedifittransmitsintheopenair.Topreventinadvertentuse
oftheST90system,pulloutthemainsplugontheProcessorUnitwheneveryourvessel
isindrydock.Additionalprecautionarymeasurersshouldbeconsidered.
Ifsomethingbreaksdown
Ifyoubelievethatsomethinghasbrokendown,contactyourlocaldealer.Alistofall
ourdealersisprovidedonourwebsite.
•https://www.kongsberg.com/st90
Ifyouareunabletocontactadealer,observethesupportinformationinthispublication.
WhenyouwanttoturnofftheST90system
YoumustneverturnofftheST90systembymeansoftheon/offswitchontheProcessor
Unit.WhenyoudonotusetheST90system,turnitoffwiththePowerbuttononthe
OperatingPanel.IfthetransducerisloweredwhenyouturnofftheST90system,itis
automaticallyretractedtoitsupperposition.
Note
IfyouturnofftheST90systembymeansoftheon/offswitchontheProcessorUnityou
candamagethesoftwareandtheinterfacesettingsusedtocommunicatewithexternal
devices.
Manualoperationofthehullunit
Intheeventofimproperoperation,thepowerfulelectricmotoronthehullunitmay
causeseriousdamagetotheequipmentand/orinjurytopersonnel.Therefore,beforeyou
startmanualoperation,readcarefullythroughtherelevantoperatingprocedures.
SimradST90

10110-0035138/A
Note
Youmustfamiliarizeyourselfwiththecorrecthandlingmethodsandtherelevantsafety
requirements.
Rulesfortransducerhandling
Atransducermustalwaysbehandledasadelicateinstrument.Incorrectactionsmay
damagethetransducerbeyondrepair.Aphysicalblowtothetransducerfacemayeasily
damageoneormoreelements.Observethesetransducerhandlingrules:
•Donotactivatethetransducerwhenitisoutofthewater.
•Donothandlethetransducerroughly.Avoidimpacts.
•Donotexposethetransducertodirectsunlightorexcessiveheat.
•Donotusehigh-pressurewater,sandblasting,metaltoolsorstrongsolventstoclean
thetransducer.
•Donotdamagetheouterprotectiveskinofthetransducer.
•Donotsteponthetransducercables.
•Donotdamagethetransducercables.Avoidexposuretosharpobjects.
Systemdescription
TheSimradST90isalongrangeandlowfrequencyshndingsonarwitha360degrees
coverage.TheST90systemisdesignedformediumandlargesizedshingvessels.
Ifhighperformanceisyournumber1criteriawhenchoosingasonar;suchaslongrange,
highresolution,narrowbeamsandhighsourcelevels,thisisyournaturalchoice.We
madenocompromisesduringthedesignoftheST90system.Ourgoalwassimplyto
maketheultimatehighperformanceshndingsonar.WiththeST90systemweuse
lowerfrequenciesthantheSX90andSU90sonars.Inordertoachievethis,acompletely
newtransducerhasbeendesigned.EachelementislargerthanthepreviousSX90and
SU90elements,butthenumberofelementsisthesameastheSU90.Thisallowsfor
thesamenarrowbeam,andultimatelyalongerrange.TheST90systemhasbeen
designedtosearchwithverylongrangesinallweatherandseaconditions.Whetherit
isheavyweather,hardbottom,openwaters,weaktargets-allechoesarehandledby
theST90systemduetothefullystabilizedandverynarrowbeamscombinedwiththe
cuttingedgesignalprocessing.
Thecentreoperationalfrequencyis19kHz.Youcanselectanyoperationalfrequency
from14to24kHz.
Thecylindricalmulti-elementtransducerallowstheomnidirectionalsonarbeamsto
betiltedelectronically.Thisallowsyoutoautomaticallytrackschoolsofsh,andto
observethewholewatervolumearoundthevessel.
SimradST90Technicalspecications

110-0035138/A11
TheST90systemoffersanumberofstandardinterfacelinesforcommunicationwith
peripheraldevicesandsensors.Typicalinputsaregeographicalinformationfroma
positioningsystem,vesselspeedandcurrentheading.Bydefault,theST90system
usesabuilt-inmotionsensor.Forimprovedoperationalaccuracy,anexternalmotion
referenceunit(MRU)canbeconnected.
ThenarrowbeamopeningangleandthehighsourcelevelmakestheST90systemavery
powerfulandhighresolutionlowfrequencysonar.Thenarrowbeamsprovidedbythe
ST90systemgiveyouseveraladvantages.
•Theyincreasetherangeandresolution,andofferaverticalviewwithadditional
detailsandaclearerpicture.
•TheymaketheST90systemevenmoreidealwhenyouneedtosearchforshclose
totheseabottom,orclosetothesurface,atlongranges.
•Theyprovideafarbetterverticalviewwithless"bottomclimbing"thatwhatisseen
onsonarswithawiderbeam.
•Thenarrowbeamsalsodecreasethenoiselevel.
TheST90systemoffersthesameuserinterfaceandoperatingsoftwareasourother
sonars,echosoundersandcatchmonitoringsystems.Thisenableseasierandfaster
trainingofnewusers.
•Theechopresentationsareoptimisedformultipledisplays.Providedthatyouhave
connectedadditionaldisplaystoyourProcessorUnit,youcanusetheDockingViews
functiontotakeanysonarviewandplaceitonaseparatedisplay.Whenyoumovea
viewtoanotherdisplay,itwillautomaticallybescaledforthebestpossibleresult.
•Itiscommonforsonarstorequiremanypingstobuildthevariousviewsintheecho
presentation.OntheST90,allthesonarviewsinthepresentationarebuiltusing
theechoesfromonesingleping.Thisdramaticallyimprovestheupdaterateand
providesbetterreal-timeinformation.
•TheST90systempermitsyoutorecordreal-timesonarsituations.Thisallowsyouto
replaycompletesequences.Theplaybackcontainstheexactsameechoinformation,
andcanbeusedformissionhistory,trainingortroubleshootingpurposes.
Greatemphasishasbeenplacedonanintuitiveuserinterfaceandthebestpossiblesonar
presentationsonahighresolutioncolourdisplay.
TheST90systemisequippedwiththecelebratedsignalprocessingsoftwaredeveloped
byKongsbergMaritime.ThisincludesHyperbolicFM(HFM)transmissions.Thispulse
typeisalsoknownas"chirp".Itensuresaclutterfreepicturewithveryhighresolution
inrange.Thesignalprocessingandbeamformingisperformedinafastdigitalsignal
processingsystemusingthefulldynamicrangeofthesignals.
TheST90systemsoftwareoperatesusingtheMicrosoft®Windows®operatingsystem.
SimradST90

12110-0035138/A
Systemdiagram
ThesystemdiagramidentiesthemaincomponentsofabasicST90system.Only
themainconnectionsbetweentheunitsareshown.Detailedinterfacecapabilitiesand
powercablesarenotshown.
ADisplay(Theseconddisplayis
optional.)
BProcessorUnit
COperatingPanel
DTransceiverUnit
EHullUnit
FHoistingmotor
GMotorControlUnit
HTransducer
Inthispublication,thecomputercan
alsobereferredtoastheProcessor
Unit,andviceversa.
Unlessotherwisespeciedina
contract,thedisplayisnotincluded
inthestandarddelivery.Thisis
acommercialitemthatcanbe
purchasedlocally.
Achoiceofhullunitsisavailable
fortheST90system.Thehullunits
offerdifferentloweringdepthsand
cablelengths.Thesametransducer
isusedonallhullunittypes.The
sameinstallationtrunkisusedonall
hullunittypes.
SimradST90Technicalspecications

110-0035138/A13
Systemunits
Topics
Displaydescription,page13
ProcessorUnitdescription,page14
TransceiverUnitdescription,page15
HullUnitdescription,page16
Transducerdescription,page17
Installationtrunkdescription,page19
Displaydescription
AdisplayisarequiredpartoftheST90system.Forbestreadability,thedisplaymustbe
protectedfromglareandhavethecorrectheightandangle.
AnycommercialdisplaycanbeusedwiththeST90system,providedthatthechosen
displaymeetstheminimumrequirements.
Tip
YoumaynditusefultohavemorethanonedisplayconnectedtotheST90system.The
numberofdisplaysmustbechosentotthepreferencesofthecrew.
Thedisplayisnotastandardpartofthedelivery.Thisisacommercialitemthatcan
bepurchasedlocally.KongsbergMaritimemayprovideasuitabledisplay.Thechosen
displaymustbedesignedformaritimeuse,anditmustmeettheminimumperformance
specications.Thevideointerfacemustmatchtheoutputformat(s)providedbythe
ProcessorUnit.
Relatedtopics
SimradST90,page7
Systemunits,page13
SimradST90

14110-0035138/A
ProcessorUnitdescription
Adedicatedmaritimecomputerisprovided.Inthispublication,thecomputercanalsobe
referredtoastheProcessorUnit,andviceversa.
TheProcessorUnitisaruggedandpowerfulcomputer.
Itisdesignedforlonglifeinademandingmaritime
environment.TheProcessorUnitcontainsthe
operationalsoftware,andofferstheuserinterfacethat
allowsyoutocontroltheST90system.Furthermore,
itoffersanumberofserialandEthernetlinesfor
communicationwithexternaldevices.TheProcessorUnitisnormallymountedon
thebridge.
TheHT20470ProcessorUnitisavailableintwoversions.TheDCversionoperateson
+24VDCwhiletheACversionoperateson100to240V AC.
Powersupply:
•Manufacturer:MeanWell
•Manufacturer’swebsite:https://www.meanwell.com
•Typedesignation:SDR-240-24
•KongsbergMaritimepartnumber:488156
Note
TheProcessorUnitdoesnotcontainanyfans.Itwillbeverywarm,evenduringnormal
operation.Thisisbydesign.Airowaroundtheunitwillsignicantlyincreasetheeffect
oftheheatsinksandtherebyalsothelifetimeoftheunit.Suchanairowishighly
recommended.Thecomputerhasbeentestedandveriedwithambienttemperatures
upto50degreesCelsius.Alowerambienttemperatureishoweverpositivefortheits
lifetime.
Note
TheProcessorUnitdoesnotcontainanyfans.Itwillbeverywarm,evenduringnormal
operation.Thisisbydesign.
Relatedtopics
SimradST90,page7
Systemunits,page13
SimradST90Technicalspecications

110-0035138/A15
TransceiverUnitdescription
TheTransceiverUnitisprovidedtotransmitacousticenergythroughwater.Aftereach
transmission,thetransceiverreceivestheechoesfromtheseabedand/orthewater
column.Theseechoesareltered,ampliedandnallyconvertedintodigitalformat.
Thistransmissionandreceptionsequenceiscommonlyreferredtoasaping.
TheTransceiverUnitisnormallylocatedinthesonarroom.Itismountedonthe
bulkheadusingpowerfulshockabsorbers.Thephysicaldistancetothehullunitis
limitedbythelengthofthetransducercables.
Thetransceivercontrolsthetransmissionandreceptionmadebythetransmittersand
receiverchannels.12identicaltransceiverboardsareused.Thesetransceiverboards
provide384individualtransmit-andreceiverchannels.TheTransceiverUnitalsoholds
anEthernetswitchandalargecapacitorbank.Aninternalpowersupplyisprovidedto
supplytherequiredDCvoltagestotheTransceiverUnit.
AhighqualityEthernetcableisusedforcommunicationwiththeProcessorUnitonthe
bridge.AnotherhighqualityEthernetcableisusedtoconnecttheTransceiverUnitto
theMotorControlUnitonthehullunit.
Itisveryimportantthathigh-qualityEthernetcablesareused.Donotmakethe
connectionusingtheexistinglocalareanetwork(LAN).
Tip
WerecommendthatyouinstallanextraEthernetcablebetweentheTransceiverUnit
andtheProcessorUnit.
Thetransducercablesarepluggedintothesidewallofthetransceivercabinetusinga
specialconnector.Theconnectorsforpowerandinterfacesarelocatedatthebottom
ofthecabinet.
Note
ToextendthelifetimeoftheTransceiverUnit,itmustbemountedatdryandclean
locationwithsufcientventilation.Observethesonarroomrequirements
TheTransceiverUnitcanbettedwithacommercialheatexchanger.Thepurposeof
theheatexchangeristoprovideastable,cleanandtemperaturecontrolledenvironment
fortheelectroniccircuitryinsidetheTransceiverUnit.Theheatexchangeralsoinhibits
dustanddirtparticlesfromenteringthetransceiver.Theheatexchangerispoweredfrom
230V ACusingaseparateoutlet.
Relatedtopics
SimradST90,page7
Systemunits,page13
SimradST90

16110-0035138/A
HullUnitdescription
Thehullunitisusedtolowerthetransducerdownbelowtheship’shullwhentheST90
systemshallbeused.WhentheST90systemisturnedoff,thetransducerishoistedfor
protection.Thehullunitislargeandcrucialpartofthesonarsystem.
Thehullunitisamechanicalconstruction.Itismountedonthetopoftheinstallation
trunk.Theinstallationtrunkpenetratestheship’shull,andallowsthetransducertobe
loweredintothesea.Thehullunitisnormallylocatedintheforwardpartofthevessel.
Thislocationisrecommendedtoavoidthenoisefromthepropellersandtheengine.
Caution
Whenthetransducerislowered,thedepthofwaterunderthevesselmustbemonitored
closely.
Ifthetransducerhitslargerobjectsorbottom,thetransducershaftmaybebent,or
-inworstcase-itcanbebrokenoff.Abrokentransducershaftwillcausewater
leakagethroughthetopoftheshaft.Ifyoususpectthatthetransducershaftisseriously
damagedwithholes,donotretractthetransducertoitsupperposition.
Topreventseriousdamagetothevesselorthevesselstability,youmusthaveawater
pumpandawarningsysteminthesonarroom.
IfyouforgettohoistthetransducerbeforetheST90systemisturnedoff,thetransducer
ishoistedautomaticallybeforethepowerisdisconnected.Thetransducerisalsohoisted
automaticallyifaseriousmalfunctionoccurstothecommunicationbetweenthebridge
andthehullunit.
Intheeventofimproperoperation,thepowerfulelectricmotoronthehullunitmay
causeseriousdamagetotheequipmentand/orinjurytopersonnel.Therefore,before
youstartmanualoperation,readcarefullythroughtherelevantoperatingprocedures.
Youmustfamiliarizeyourselfwiththecorrecthandlingmethodsandtherelevantsafety
requirements.
TheST90systemcanbeprovidedwithoneofthefollowinghullunits:
HullUnitLoweringdepth(m)Transducercable(m)Maximumspeed
(knots)
4.6 ST921.2
7
16
4.6 ST931.6
7
16
4.6 ST942.1
7
11
Thesametransducerisusedonallhullunittypes.
IfaHullUnitControllerissuppliedwiththesystem,theMotorControlUnitcabinetisusedasa
junctionbox.
SimradST90Technicalspecications

110-0035138/A17
Onsomevessels,additionaltransducerprotectionisrequired.Oneexampleisvessels
workinginarcticconditions.Itisimportantforthemtopreventicefromdamaging
thetransducer.Agatevalveisthenaddedtothehullunitinstallation.Bymeansofa
mechanicalconstructionitshutsoffthebottomoftheinstallationtrunkwhentheST90
systemisnotused.
Formoreinformation,refertotheend-userdocumentationprovidedbythemanufacturer.
Important
Thehullunitgantrymustbesecuredtothebulkheadbymeansofmechanicalsupport
brackets.Thedimensionsandstrengthofthesupportbracketsmustbeadequateto
preventvortexinducedvibrations.Thisisaninvariablerequirementtoensurethesafety
oftheST90systemandthevessel.
Werecommendthatsupportbracketsareplacedpointingatminimumthreedirections
withapproximately120degreesbetweenthem.
Themechanicalsupportbracketsmustbedesignedandmanufacturedbytheinstallation
shipyardtotthecompleteinstallationinthesonarroom.Allcalculationsmadeto
supportthedesignmustmeettheapplicablesafetyrequirements,andapplytothe
physicalpropertiesofthecompleteinstallation.
Relatedtopics
SimradST90,page7
Systemunits,page13
Transducerdescription
Thecylindricaltransducerallowsthesonarbeamtoprovideafull360degreescoverage
ofthewatervolume.
Thetransducerconvertstheelectricenergygeneratedbythetransmittercircuitryto
physicalvibrations.Thesevibrationsalterthewaterpressure,andcreateanacoustic
pulsethatissentintothewater.Theacousticsignalistransmittedasabeam.The
durationoftheacousticpulse,aswellasitsfrequencyandshape,arecontrolledbythe
systemsoftware.Thedirectionandopeningangleofthebeamiscontrolledbythe
transmittercircuitryandthephysicalpropertiesofthetransducer.Afterthetransmission,
thetransducerworksasa"microphone".Itconvertsthewaterpressurecreatedbythe
acousticechoestoelectricenergy.Theseweakechosignalsaresenttotheampliers
inthereceivercircuitry.
SimradST90

18110-0035138/A
Note
Thetransduceriscoveredwithathickredorblackprotectivecoatingmadeofaspecial
plastictype.Theprotectivecoatingisavitalpartofthetransducer.Itisveryimportant
thatneitherthiscoatingnortheinternalpartsofthetransduceraredamagedduring
thehandling,installationorcleaning.Anyholesand/orscratchesinthetransducer
surfacewillallowwatertopenetratethetransducer .Ifaleakoccurs,thetransducer
mustbereplaced.
ALowerpartofshaftsleeve
BLowerpartoftransducershaft
CTransducerwithitsredprotectivecoating
Thetransducerismountedatthebottomendofthehullunit’s
transducershaft.Thisallowsthetransducertobeloweredinto
thewaterforoperationaluse,andretractedforprotectionwhen
theST90systemisturnedoff.Byloweringthetransducerinto
thewater,youmayalsobeabletoreducethenoisecreatedby
thelaminarowofwateralongthehull.
Thetransducerislargeandheavy.Itcontains384individual
elements.
Rulesfortransducerhandling
Atransducermustalwaysbehandledasadelicateinstrument.Incorrectactionsmay
damagethetransducerbeyondrepair.Aphysicalblowtothetransducerfacemayeasily
damageoneormoreelements.Observethesetransducerhandlingrules:
•Donotactivatethetransducerwhenitisoutofthewater.
•Donothandlethetransducerroughly.Avoidimpacts.
•Donotexposethetransducertodirectsunlightorexcessiveheat.
•Donotusehigh-pressurewater,sandblasting,metaltoolsorstrongsolventstoclean
thetransducer.
•Donotdamagetheouterprotectiveskinofthetransducer.
•Donotsteponthetransducercables.
•Donotdamagethetransducercables.Avoidexposuretosharpobjects.
Relatedtopics
SimradST90,page7
Systemunits,page13
SimradST90Technicalspecications