Konsberg EM 124 User manual

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March2019©KongsbergMaritimeAS
KongsbergEM124
MultibeamEchoSounder
InstallationManual
Image:BathymetryoftheNorthernPortionoftheMarianaTrench.
CourtesyofDrJamesV .Gardener ,UniversityofNewHampshire.

KongsbergMaritimeAS
www.kongsberg.com
Documentinformation
•Product:KongsbergEM124
•Document:InstallationManual
•Documentpartnumber:443140
•Revision:A
•Dateofissue:11March2019
Copyright
TheinformationcontainedinthisdocumentremainsthesolepropertyofKongsberg
MaritimeAS.Nopartofthisdocumentmaybecopiedorreproducedinanyformorby
anymeans,andtheinformationcontainedwithinitisnottobecommunicatedtoathird
party,withoutthepriorwrittenconsentofKongsbergMaritimeAS.
Warning
Theequipmenttowhichthismanualappliesmustonlybeusedforthepurposefor
whichitwasdesigned.Improperuseormaintenancemaycausedamagetothe
equipmentand/orinjurytopersonnel.Y oumustbefamiliarwiththecontentsofthe
appropriatemanualsbeforeattemptingtooperateorworkontheequipment.
KongsbergMaritimedisclaimsanyresponsibilityfordamageorinjurycausedby
improperinstallation,useormaintenanceoftheequipment.
Disclaimer
KongsbergMaritimeASendeavourstoensurethatallinformationinthisdocumentis
correctandfairlystated,butdoesnotacceptliabilityforanyerrorsoromissions.
Supportinformation
Ifyourequiremaintenanceorrepair,contactKongsbergMaritime’s
supportorganisation.Y oucanalsocontactususingthefollowingaddress:
[email protected].Ifyouneedinformationaboutourother
products,visithttps://www.km.kongsberg.com.

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Tableofcontents
ABOUTTHISMANUAL..............................................................7
KONGSBERGEM124................................................................9
Systemdescription...........................................................................................................10
Technicaldetails...............................................................................................................11
Systemdiagram................................................................................................................12
Systemunits.....................................................................................................................13
Transducerdescription...........................................................................................13
TransmitterUnitdescription...................................................................................14
ReceiverUnitdescription.......................................................................................14
ProcessingUnitdescription....................................................................................14
HydrographicWorkStationdescription.................................................................15
Supportinformation.........................................................................................................16
PREPARATIONS.....................................................................17
Tools,equipmentandconsumablesrequiredforEM124installation.............................17
Personnelqualications...................................................................................................18
Sonarroomrequirements.................................................................................................19
Environmentalrequirements..................................................................................19
Sizeandaccessrequirements.................................................................................19
Requirementsforinsulation,heatingandventilation.............................................20
Requirementsforelectricalinstallations,cablesandcommunication...................20
Wheretoinstallthetransducer........................................................................................22
Introductiontotransducerlocation.........................................................................22
Mountthetransducerdeep.....................................................................................22
Avoidprotrudingobjectsnearthetransducer.........................................................23
Keepthetransducerfarawayfromthepropellers.................................................24
Mountthetransduceratasafedistancefrombowthruster(s)...............................24
Summaryandgeneralrecommendations...............................................................24
Acousticnoise..................................................................................................................27
Contributingfactors................................................................................................27
Selfnoise................................................................................................................28
Ambientnoise.........................................................................................................31
Electricalselfnoise................................................................................................31
Somemeanstoreduceacousticnoise....................................................................31
INSTALLINGTHETRANSDUCER.............................................34
Transducerdescription.....................................................................................................35
Transducerinstallationprinciples....................................................................................37
Introduction............................................................................................................37
InstallationManual

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Gondola..................................................................................................................39
Blister.....................................................................................................................40
Flushmounted........................................................................................................41
Externalmountedwithfairings..............................................................................41
Transducerinstallationsummary.....................................................................................43
Manufacturingandinstallingthecasings........................................................................46
Designing,manufacturingandmountingthesteelconduits............................................48
InstallingtheRXmountingframe...................................................................................52
InstallingtheTXmountingframes..................................................................................55
InstallingtheRXTransducersintothemountingframes................................................57
InstallingtheTXTransducersintothemountingframes................................................60
Rulesfortransducerhandling..........................................................................................63
Paintingthetransducerface.............................................................................................65
Approvedanti-foulingpaints...........................................................................................67
INSTALLINGTHEEM124HARDWAREUNITS.........................69
TransmitterUnit...............................................................................................................70
InstallingtheTransmitterUnit...............................................................................71
RIO-Pboard-dipswitchsetting............................................................................73
ReceiverUnit...................................................................................................................74
InstallingtheReceiverUnit....................................................................................75
ReceiverUnit-dipswitchsetting..........................................................................77
ProcessingUnit................................................................................................................78
InstallingtheProcessingUnit.................................................................................78
ProcessingUnitrearpaneldescription...................................................................80
ProcessingUnitcircuitboardsandmodules..........................................................81
CBMFboard-dipswitchsetting...........................................................................82
InstallingtheHydrographicWorkStation.......................................................................83
InstallingtheHydrographicWorkStation..............................................................83
HydrographicWorkStationrearconnectors..........................................................86
CABLELAYOUTANDINTERCONNECTIONS.............................88
Cableplans.......................................................................................................................89
Cableplan,ProcessingUnit...................................................................................90
Cableplan,TransmitterUnit..................................................................................91
Cableplan,ReceiverUnit,1degree.......................................................................99
Synchronizationoverview,2TransmitterUnits1ReceiverUnit.........................102
Remoteon/offoverview,2TransmitterUnits1ReceiverUnit............................103
HydrographicWorkStation..................................................................................104
ListofEM124cables....................................................................................................105
Clocksynchronization(1PPS).......................................................................................109
Externalsynchronization...............................................................................................111
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Cabledrawingsandspecications.................................................................................114
RS-232seriallineusingthreewiresandRJ45connector....................................115
RS-422seriallineusingvewiresandRJ45connector......................................116
Clocksynchronisation(1PPS)usingacoaxcable...............................................117
Externalsynchronisation......................................................................................118
Remotecontrol.....................................................................................................119
RemoteControlusingK-Rem..............................................................................120
Dummyplugfornotusingremotecontrol...........................................................121
RemotecontrolofTransmitterUnit.....................................................................122
RemotecontrolofReceiverUnit..........................................................................124
Remotecontroloverview.....................................................................................126
TransmitTransducercable...................................................................................128
ReceiveTransducercable.....................................................................................129
DIMENSIONALSURVEYINGANDALIGNMENT......................130
Aboutdimensionalsurveyingandalignment................................................................131
Dimensionalsurveying..................................................................................................131
Alignment......................................................................................................................132
Transducerarrayatness...............................................................................................133
Checkingthetransducerarrayatnessandcorrectingdeviations.................................134
Calibration.....................................................................................................................135
Vesselcoordinatesystem...............................................................................................135
TECHNICALSPECIFICATIONS..............................................137
Performancespecications............................................................................................138
Interfacespecications...................................................................................................140
Datagramformats.................................................................................................141
ProcessingUnit.....................................................................................................142
Externalsensorsrequirements..............................................................................145
HydrographicWorkStation..................................................................................146
Weightandoutlinedimensions......................................................................................147
Powerrequirements.......................................................................................................150
Environmentalrequirements..........................................................................................152
Dimensionalsurveyaccuracyrequirements..................................................................155
Alignmentspecications................................................................................................157
DRAWINGFILE....................................................................158
Drawingnumbersreferencedinthisdocument.............................................................158
InstallationManual

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KongsbergEM124

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Aboutthismanual
Purposeofmanual
Thepurposeofthismanualistoprovidetheinformation,proceduresandbasicdrawings
requiredforthephysicalinstallationoftheEM124.
Targetaudience
Themanualisintendedfortechnicalpersonnel;suchasskilledshipyardworkers,
electricians,qualiedengineersandnavalarchitects.Itisassumedthatyouunderstand
thegeneralprinciplesofmaritimeelectronicequipment.Youmustalsobefamiliarwith
computerhardware,interfacetechnologyandinstallationofelectronicandmechanical
products.
Weassumethatyouarefamiliarwiththebasicacousticprinciplesofsoundinwater.
Wealsoexpectthatyouhavesomeexperiencewithmultibeamand/orsinglebeamecho
soundersinhydrographicapplications..
Installationinstructions
Youmustfollowtheinstructionsinthismanualtoensureoptimalperformance.Asa
guide,installationproceduresarepresentedintheordertheymustbedone.
Theequipmentdescribedinthismanualincludesthecompletesystemwithrelevant
cabinets.Unitsprovidedlocallybythecustomer,installationshipyardorlocal
representativearenotdescribed.
Themanualalsodenestheequipmentresponsibility,andprovidesapplicable
instructionsforunpackingandstorageofunits.
Note
Youmustfollowtheinstructionsgiveninthismanual.Ifnotitmayaffectthewarranty.
KongsbergMaritimeASwillacceptnoresponsibilityforanydamageorinjurytothe
system,vesselorpersonnelcausedbyequipmentthathasbeenincorrectlyinstalledor
maintained,orbydrawings,instructionsorproceduresthathavenotbeenprepared
byus.
Aboutthismanual

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Installationdrawings
Theinstallationshipyardmustprovideallnecessaryinstallationdrawingsunless
otherwisespeciedinthedeliverycontract.
KongsbergMaritimeASmay,onspecialorder,provideassistancetothesedrawings.
Note
Ifrequired,alldocumentsprovidedbytheshipyardforthephysicalinstallationof
theEM124mustbeapprovedbythevessel’ snationalregistryandcorresponding
maritimeauthorityand/orclassicationsociety.Suchapprovalmustbeobtainedbefore
theinstallationcanbegin.Theshipownerandshipyarddoingtheinstallationare
responsibleforobtainingandpayingforsuchapproval.
TheoutlinedimensionsoftheEM124unitsarefoundintheDrawinglechapter
inthismanual.
Onlineinformation
ForinformationabouttheEM124andotherproductsfromKongsbergMaritime,visit
ourwebsite.
•https://www.km.kongsberg.com
Registeredtrademarks
Observetheregisteredtrademarksthatapply.
Windows®isaregisteredtrademarkofMicrosoftCorporationintheUnitedStatesand
othercountries.
EM®isaregisteredtrademarkofKongsbergMaritimeASinNorwayandothercountries.
KongsbergEM124InstallationManual

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KongsbergEM124
Topics
Systemdescription,page10
Technicaldetails,page11
Systemdiagram,page12
Systemunits,page13
Supportinformation,page16
KongsbergEM124

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Systemdescription
EM124multibeamechosounderisahighperformanceechosounderfordeepwater
mapping.
TheEM124isdesignedtoperformseabedmappingtofulloceandepthwithan
unsurpassedresolution,coverageandaccuracy.Thesystemiscosteffective,reliable,
andeasilyoperated.ThedesignoftheEM124isbasedonmorethan50yearsof
hydrographicexperiencewithechosounders,sonarsandunderwaterpositioningfor
civilianandmilitaryuse.Itisthelatestmodelinaseriesofdeepseamultibeamecho
soundersthatstartedwiththeEM12in1990.
TheEM124consistofnewstate-of-the-artelectronicsandseparatetransmitandreceive
transducersinaMillsCrossconguration.Itusesthesameeld-proventransducersas
theEM122,makingiteasytoupgrade.Carehasbeentakentodesignahighly,modular
andexiblesolutionwithcompactelectronicsforeasierandfasterinstallation.Duetoa
exibletransducerdesign,thesystemcanbetailoredtoalmostanyrequiredsize.The
largeststandardsize,0.5x1degrees,givestheultimatesystemperformanceintermsof
resolutionandrange,whileasmaller4x4degreessolutionallowingfulloceandepth
surveysevenonsmallervessels.
TheEM124multibeamechosounderconsistsofthefollowingmainunits.
•Transducerarrays
•TransmitterUnit(s)
•ReceiverUnit(s)
•ProcessingUnit
•HydrographicWorkStation
Toformacompletesystemitisalsorequiredtohavesensorsprovidingvesselattitude,
velocity,position,soundspeedproleofthewatercolumnandspeedofsoundatthe
transducerdepth.
KongsbergEM124InstallationManual

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Technicaldetails
TheEM124operatesatsonarfrequenciesinthe10.5-13.5kHzrange.Thetransmitfan
isdividedinto4sectorsinshallowmodes(8sectorsindeepmodes)tomaximizerange
capabilitybutalsotosuppressinterferencefrommultiplesofstrongbottomechoes.
Thesectorsaretransmittedsequentiallywithineachping,andusesdistinctfrequencies
orwaveforms.
Thenominalsonarfrequencyis12kHzwithanangularcoveragesectorofupto150
degreesand1600beamsperping.Achievableswathwidthonaatbottomwillnormally
beupto6times(143degrees)thewaterdepth.Theangularcoveragesectorisoperator
controllableormaybesettoaxedrange.Itmayalsobesettovaryautomaticallywith
depthaccordingtoachievablecoverage.Thismaximizesthenumberofusablebeams.
Thebeamspacingisnormallyhighdensityequidistantwithequiangleavailable.
Thetransmitfanissplitinseveralindividualsectorswithindependentactivesteering
accordingtovesselroll,pitchandyaw.Thisplaceallbeamsona“bestt”toaline
perpendiculartothesurveyline,thusensuringauniformsamplingofthebottomand
100%coverage.
Indualswathmodethetransmitfanisduplicatedandtransmittedwithasmalldifference
inalongtracktilt.Theappliedtilttakesintoaccountdepth,coverageandvesselspeedto
giveaconstantbeamseparationalongtrack.
ThesectorsarefrequencycodedorhaveFMchirps,andtheyaretransmittedsequentially
ateachping.Thesectorsteeringisfullytakenintoaccountwhenthepositionanddepth
ofeachbeamiscalculated,asistherefractionduetothesoundspeedprole,vessel
attitudeandinstallationangles.Thepulselengthandrangesamplingratearevariable
withdepth(autoormanual)forbestresolution.
Inshallowwatersduecareistakentotheneareldeffectsthroughneareldfocusing
individuallyappliedinthedifferentsectors.
EM124appliesonefocusrangeforeachofthetransmitsectorswhichareusedfor
shallowwaterenvironment.Dynamicbeamfocusingisusedforthereceptionbeams.
Thepingrateismainlylimitedbytheroundtriptraveltimeinthewateruptoaping
rateofmorethan5Hz.
ThenumberofindividualTXandRXmodulesinthetwoarraysdependsonthechosen
conguration.Thestandardtypesidentiedby"transmissionxreception"beamwidth
are:
•0.5x1degreesystem:96transmittransducermodulesand16receivetransducer
modules
•1x1degreesystem:48transmittransducermodulesand16receivetransducermodules
•1x2degreessystem:48transmittransducermodulesand8receivetransducermodules
•2x2degreessystem:24transmittransducermodulesand8receivetransducermodules
•2x4degreessystem:24transmittransducermodulesand4receivetransducermodules
•4x4degreessystem:12transmittransducermodulesand4receivetransducermodules
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Systemdiagram
ThesystemdiagramidentiesthemaincomponentsofabasicEM124system.Only
themainconnectionsbetweentheunitsareshown.Detailedinterfacecapabilitiesand
powercablesarenotshown.
AHydrographicWork
Station
BInterfaces:
•Soundspeed
sensors
•Tide
•Centredepth
output
CProcessingUnit
DInterfaces:
•Positioning
systems
•Attitude(roll,
pitchandheave)
•Soundspeed
sensor
•Velocity
•Clock
•Trigger
input/output
•Clocksynchronisation(1PPS)
ETransmitterUnit(TXU)
FReceiverUnit(RXU)
GTransmittransducermodules
HReceivetransducermodules
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Systemunits
Topics
Transducerdescription,page13
TransmitterUnitdescription,page14
ReceiverUnitdescription,page14
ProcessingUnitdescription,page14
HydrographicWorkStationdescription,page15
Transducerdescription
Atransducerisadevicethatconvertsoneformofenergytoanother.Inanechosounder
systemthetransducerconvertsbetweenelectricenergyandsound.
Receivetransducermodule
TheEM124usesseparatetransducerarraysfor
transmittingandreceivingsoundpulses.Both
transducerarrayshaveseveralmoduleswhichare
assembledinmountingframes.
Thetwotransducerarraysarenormallymountedas
“T”or“L”congurationsunderthevessel’shull(Mills
Crossconguration).Thetransmittransducerarray
shouldbealignedparalleltothevessel’skeel.The
receivertransducerarrayshouldbealigned90degreesonthekeel.Bothtransducer
arraysshouldbehorizontalonaplaneonthekeel.
Thetransmittransducerarraycontainsupto96modulesinaccordancewiththechosen
beamwidth.Eachmodulecontains18elementsarrangedinrowsof6elements.Each
elementisindividuallyconnectedtoitscorrespondingtransmitterintheTransmitter
Unit(s).Itcanthusbedrivenwithanuniqueamplitudelevelandphasetoallowforming
oftherequiredtransmitsectorswithindividualsteering.
Thereceivetransducercontainsupto16modulesinaccordancewiththechosen
beamwidth.Eachmodulecontains8transducerstaves,andthesehaveindividual
electricalconnectionstotheircorrespondingpreampliersintheReceiverUnit(s).Each
stavecanthusbegivenuniqueamplitudeandphasecontroltoallowformingofthe
requiredreceivebeams.
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TransmitterUnitdescription
TheEM124TransmitterUnithasalltransmitelectronics,likecontrolprocessors,power
ampliers,powersupply,capacitorbatteryandEthernetinterface.
TheTransmitterUnitisawall-mountedsteelcabinetwithintegratedshockandvibration
absorbers,designedforbulkheadmounting.One19inchsub-rackiscontainedinthe
cabinet.Thenumberofcircuitboardsinthesub-rackwilldependuponthechosen
transducerconguration.
TwistedpairEthernetisusedfordatacommunicationwiththeProcessingUnit.
TheTransmitterUnitisnormallylocatedina"sonarroom"closetothetransducerarrays.
ReceiverUnitdescription
TheEM124ReceiverUnithasallreceiveelectronics,likecontrolprocessor,ampliers,
Analog-to-DigitalConverters,powersupplyandEthernetinterface.
TheReceiverUnitisasmallwall-mountedsteelcabinet
withintegratedshockandvibrationabsorbers,designed
forbulkheadmounting.Thenumberofcircuitboards
willdependuponthechosentransducerconguration.
TwistedpairEthernetisusedfordatacommunication
withtheProcessingUnit.
TheReceiverUnitisnormallylocatedina"sonar
room"closetothetransducerarrays.
ProcessingUnitdescription
TheEM124ProcessingUnitisprovidedtoprocessthesignalstoandfromthe
TransmitterandReceiverUnits.
TheEM124ProcessingUnitisanindustrial
computerusingbothCOTS(commercialoff-the-shelf)
componentsandcustommadecomponents.Theunitis
designedandtestedforruggeduse.
TheProcessingUnitperformsthereceiverbeamforming,bottomdetection,andmotion
andsoundspeedcorrections.Itcontainsallinterfacesfortime-criticalexternalsensors
suchasvesselattitude(roll,pitch,headingandheave),vesselpositionandexternal
clock.Morethanonesensorofeachtypemaybeconnectedsimultaneously,withonein
useandallofthemlogged.
TheProcessingUnitcontrolstheTransmitterandReceiverunitsviaEthernet
communication,andisalsointerfacedtotheOperatorstationviaEthernet.
The48VoutputfromtheProcessingUnitcanbeusedforremoteon/offcontrolofthe
TransmitterandReceiverUnits.
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TheProcessingUnitisnormallylocatedina"sonarroom"closetothetransducerarrays.
Theunitcanalsobeplacedinthe"surveyroom"oronthebridge.
HydrographicWorkStationdescription
TheHydrographicWorkStationistheoperatorstationfortheEM124.
Adedicatedmaritimecomputerisprovidedwiththe
EM124MultibeamEchoSounder.Itissetupwith
allnecessarysoftware.
TheHydrographicWorkStationisbasedonthe
Microsoft®Windows10operatingsystem.
TheHydrographicWorkStationisnormallymounted
neartheoperatorworkspace.
KongsbergEM124

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Supportinformation
ShouldyouneedtechnicalsupportforyourEM124youmustcontactaKongsberg
Maritimeofce.Alistofallourofcesisprovidedonourwebsite.Y oucanalsocontact
ourmainsupportofceinNorway.
A24hourtelephonesupportservicemayalsobeavailabledependingofthelevelof
SLA(ServiceLevelAgreement).
•Companyname:KongsbergMaritimeAS
•Address:Strandpromenaden50,3190Horten,Norway
•Website:https://www.km.kongsberg.com
•E-mailaddress:[e-mail]
KongsbergEM124InstallationManual

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Preparations
Topics
Tools,equipmentandconsumablesrequiredforEM124installation,page17
Personnelqualications,page18
Sonarroomrequirements,page19
Wheretoinstallthetransducer,page22
Acousticnoise,page27
Tools,equipmentandconsumablesrequired
forEM124installation
InordertodotheEM124installation,allnecessarytoolsandequipmentformechanical
work,cabinetinstallationandelectricalwiringmustbeavailable.
Itisnotpracticaltoprovideadetailedlistofallnecessarytoolsandequipment.Youmust
beequippedwithastandardsetoftools.Thistoolsetmustcomprisethenormaltoolsfor
electronicandelectromechanicaltasks.Thisincludesdifferentscrewdrivertypes,pliers,
spanners,acablestripper,asolderingiron,etc.Eachtoolmustbeprovidedinvarious
sizes.Werecommendthatalltoolsaredemagnetizedtoprotectyourequipment.
However,youmustmakesurethatthefollowingspecializedtoolsareavailable.
•Allnecessarytoolsandconsumablesrequiredforwelding
•Allnecessarytoolsandconsumablesrequiredforphysicalinstallationoftransducer
framesandtransducermodules
•Allnecessarytoolsandconsumablesrequiredforelectricalinstallations
•AnarticulatedjackorsimilararrangementcapableofliftingtheindividualEM124
units
•Torquewrench
Preparations

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Note
Ifyouneedspecicconsumables,orifspecialtoolsand/ortestinstrumentsarerequired,
theseareidentiedintherelevantprocedure(s).
Personnelqualications
TheinstallationoftheEM124isademandingtask.Itisveryimportantthatthe
personnelinvolvedintheinstallationtasksarecompetentandexperiencedcraftsmen.
Asaminimum,thefollowingcertiedcraftsmenmustbeavailable.
•ServiceengineerfromKongsbergMaritime
•Welders
•Electricians
Note
Thequalityoftheweldingiscriticaltothesafetyofthevessel.Weldingmustonlybe
donebyacertiedwelder .
Ifapplicable,thenalinstallationweldsmustbeapprovedbythevessel’ snational
registry,thecorrespondingmaritimeauthorityand/orclassicationsociety.Observethe
relevantrulesandregulationsrelatedtowelding.
KongsbergEM124InstallationManual

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Sonarroomrequirements
Topics
Environmentalrequirements,page19
Sizeandaccessrequirements,page19
Requirementsforinsulation,heatingandventilation,page20
Requirementsforelectricalinstallations,cablesandcommunication,page20
Environmentalrequirements
TheEM124unitsmustbeinstalledinadryanddust-freeenvironment.Theunitsarenot
fullyprotectedagainsthumidity,dustorwater.
Itisimportantthatthesonarroomiskeptdry.TheEM124unitsmustnotbeexposed
toexcessivetemperatures,dust,moistureorhumidity.Suchconditionscancause
corrosiveattacksandsubsequentfailurestotheelectroniccircuitry.Visitthesonarroom
atregularintervalstochecktemperatureandhumidity,andtakethenecessaryactions
iftheenvironmentalconditionsarepoor.
Avoidrunninglargepowercablestroughthesonarroom.
ObservetheenvironmentalspecicationsrelatedtotheEM124units.
Sizeandaccessrequirements
Awelldesignedsonarroomwithawellttedsizeandeasyaccessreducestheriskof
corrosion,andsimpliesmaintenance.Thisincreasessystemreliability.
Thesonarroommustbelargeenoughtohouseallthesystemunits.Theroommust
provideenoughspacetoallowefcientmaintenance.Youmustbeabletokeepallthe
cabinetdoorsfullyopenwithoutunduerestrictiontoyourmovements.
1Theroommustnotbeusedforanyotherheavymachinery.
2Theroommustnotbeunnecessarilyobstructedbygirders,pipesetc,whichmay
causeinstallationproblemsorimpedemaintenance.
3Thesonarroommustbeaccessibleunderallconditionsatseaorataberth.
4Alldoorsorhatchesmustbedesignedsothatthetoolsandequipmentcanbe
removedwithoutbeingdisassembled.
Preparations

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Requirementsforinsulation,heatingandventilation
Thebulkheadsinthesonarroomshouldbeinsulatedandprovidedwithaninteriorwall
tothedeck.Theroomshouldbeequippedwithheaterandconnectedtothevessel's
ventilationsystem.
Heatingrequirements
Heatingisaneffectivemethodforreducinghumidity.Theheaterinthesonarroommust
dimensionedtomaintaintheequipmentwithinitsenvironmentaltolerances.
ObservetheenvironmentalspecicationsrelatedtotheEM124units.
Ventilationrequirements
Thesonarroomshouldbeconnectedtothevessel'sventilationsystemtoensureasupply
ofcoolingair.Ifaventilationsystemisnotavailable,installtwo3”pipesfromthesonar
roomtoasuitablefreshairlocationondeck.
Thefreshairshouldentertheroomasclosetotheooraspossible,andshouldbe
extractedfromashighaspossible.Afunnelshapeddrip-collectormustbemounted
belowtheventpipestodivertmoisturetothebilge.Onthemaindeck,thebest
ventilationisprovidedwhentheoutletpipeisatleastfourmetershigherthantheinlet
pipe.Tokeepoutseawater,rainandspray,theventilationpipesmustbettedwith
goosenecksoranequivalentdesign.
Note
Ifthevesselislikelytooperateintropicalconditions,asuitableairconditioningsystem
mustbeinstalled.Theairconditioningsystemmustbeabletoprovideanambient
temperaturethatdoesnotexceedthemaximumoperatingtemperaturesoftheEM124
unitsthatareinstalledintheroom.
Requirementsforelectricalinstallations,cablesand
communication
Theelectricalinstallationsinthesonarroommustmeetminimumrequirementsto
providesuitablelightsandsupplypower.
Lightrequirements
Thesonarroommustbeequippedwithsuitablelightingtosimplifytheinstallation
andtoaidfuturemaintenance.
Communicationrequirements
Thesonarroomshouldbeequippedwithatelephone,anintercomsystem,oranyother
meansoforalcommunicationbetweenthesonarroomandthebridgeand/orcontrol
room(s).
KongsbergEM124InstallationManual