Simrad ES38-12 DATASHEET

Installation manual

TECHNOLOGY FOR SUSTAINABLE FISHERIES

www.simrad.com

Simrad ES38-12
38 kHz split-beam transducer

SimradES38-12

Installationmanual

Thisdocumentprovidesageneraldescriptionofhowto
installtheSimradES38-12Splitbeamtransducer.The
informationmustberegardedasgeneralguidelinesand
recommendationsonly.Theinstallationshipyardmust
designandmanufactureinstallationhardwaretotthe
ES38-12transduceroneachindividualvessel.

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17.02.2010

©

KongsbergMaritimeAS

Documenthistory

Simraddocumentnumber:344276/ISBN-13:978-82-8066-119-7/Currentrevision:A

Rev.A15.022010

Copyright

©2010KongsbergMaritimeAS
TheinformationcontainedinthisdocumentremainsthesolepropertyofKongsbergMaritimeAS.Nopart
ofthisdocumentmaybecopiedorreproducedinanyformorbyanymeans,andtheinformationcontained
withinitisnottobecommunicatedtoathirdparty,withoutthepriorwrittenconsentofKongsberg
MaritimeAS.Thedocument,oranypartofit,maynotbetranslatedtoanyotherlanguagewithoutthe
writtenapprovalfromKongsbergMaritimeAS.

Firstversion.

Disclaimer

KongsbergMaritimeASendeavourstoensurethatallinformationinthisdocumentiscorrectandfairly
stated,butdoesnotacceptliabilityforanyerrorsoromissions.

Warning

Theequipmenttowhichthismanualappliesmustonlybeusedforthepurposeforwhichit
wasdesigned.Improperuseormaintenancemaycausedamagetotheequipmentand/orinjury
topersonnel.Theusermustbefamiliarwiththecontentsoftheappropriatemanualsbefore
attemptingtoinstall,operateorworkontheequipment.
KongsbergMaritimeASdisclaimsanyresponsibilityfordamageorinjurycausedbyimproper
installation,useormaintenanceoftheequipment.

Supportinformation

Ifyourequiremaintenanceorrepair,contactyourlocaldealer.Youcanalsocontactususingthefollowing
address:[e-mail]tourotherproducts,visitourwebsite.On
thewebsiteyouwillalsondalistofourdealersanddistributors.

KongsbergMaritimeAS

www.kongsberg.com

Installationmanual

Tableofcontents

ABOUTTHISMANUAL.......................................................5

SIMRADES38-12..............................................................6

WHERETOMOUNTTHETRANSDUCER...............................7

HOWTOINSTALLTHETRANSDUCER..............................11

Transducerinstallationinblister............................................................................11

Useamountingplatewheneverprovided.....................................................11

Smoothsurfaceisimportant........................................................................11

Example:Largecirculartransducer..............................................................12

Example:Mediumandlargetransducers,principle.......................................13

Example:Mediumandlargetransducers,detail............................................13

Commonguidelines....................................................................................14

Toe-in........................................................................................................14

Physicallocation.........................................................................................14

Transducerinstallationinboxkeel.........................................................................15

Usemountingplatewheneverprovided........................................................15

Smoothsurfaceisimportant........................................................................15

Example:Boxkeelinstallation....................................................................16

Transducerushmountedinasteeltank...............................................................16

Usemountingplatewheneverprovided........................................................16

Smoothsurfaceisimportant........................................................................16

Waterlled.................................................................................................16

Example:Flushmountinginasteeltank......................................................17

Transducerwithacousticwindow..........................................................................17

Usemountingplatewheneverprovided........................................................17

Smoothsurfaceisimportant........................................................................17

Example:Acousticwindow.........................................................................18

Transducermountedinsidethehull.......................................................................18

Usemountingplatewheneverprovided........................................................18

Smoothsurfaceisimportant........................................................................18

Example:Mountinginsidethehull..............................................................19

Transducermountedonadropkeel.......................................................................19

Retractabletransducer............................................................................................20

TOWEDBODYINSTALLATION.........................................21

Generalrequirements.............................................................................................21

Smoothsurfaceisimportant........................................................................21

Usemountingandclampingringswheneverprovided...................................21

Useamountingplatewheneverprovided.....................................................21

Installationinatowedbody...................................................................................22

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Example:Smalltransducer..........................................................................23

Example:Mediumandlargetransducers......................................................23

Example:Dualtransducerarrangement........................................................24

STEELCONDUIT..............................................................25

TRANSDUCERHANDLINGANDMAINTENANCE................26

Rulesfortransducerhandling.................................................................................26

Rulesfortransducermaintenance..........................................................................27

Approvedanti-foulingpaintsfortransducers.........................................................28

Usingself-lockingtaps...........................................................................................28

IntroductiontoEmugeself-lockingthreads...................................................29

Drawingstandard........................................................................................30

Tapsandgauges..........................................................................................30

Self-locktapsprovidedbySimrad...............................................................31

Supplierandmanufacturer...........................................................................31

TRANSDUCERCABLESPLICING.......................................32

DRAWINGFILE...............................................................33

Echosounderconnections......................................................................................33

Splicingthetransducercable.......................................................................33

GeneralPurposeTransceiver(GPT)wiring...................................................34

GeneralPurposeTransceiver(GPT)transducerplugassembly.......................35

ES38-12Outlinedimensionsandinstallationdrawings.........................................36

Outlinedimensions[111337].......................................................................37

Mountingplate[111492].............................................................................38

Installationprinciples[111495]....................................................................39

4

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Aboutthismanual

Aboutthismanual

Purpose

Thepurposeofthisinstallationmanualistoprovidethegenericdescriptionsand
illustrationsthatallowsyoutounderstandthebasicprinciplesforechosounder
transducerinstallation.

Abouttheinformationprovidedinthisdocument

Theinformationinthisdocumentmustberegardedasgeneralguidelinesand
recommendationsonly.Theinstallationshipyardmustdesignandmanufacture
installationhardwaretoteachindividualtransducerandvessel.

Approvalbymaritimeauthorities

Wheneverrequired,theinstallationshipyardmustalsohavetheinstallationapprovedby
theapplicablemaritimeauthorities.

Additionalinformation

Foradditionaldetailedinformationaboutthetransducertobeinstalled,refertothe
documentationprovidedwiththetransducer.Drawingsanddescriptionscanalsobe
obtainedfromh

t t p : / / w w w . s i m r a d . c o m .

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SimradES38-12

SimradES38-12

Thepurposeofthismanualistheprovidethebasicinformationrequiredtoinstallthe
SimradES38-12Splitbeamtransducer.

Transduceranddocuments

•SimradES38-12:KSV-111497

•Datasheet:164276

•Drawings:

–Outlinedimensions:111337

–Mountingplate:111492

–Installationprinciples:111495

Note

Althoughdrawingsareprovidedtoexplaintheinstallationprinciples,theinstallation
shipyardmustprovidethenaldrawingsrequiredtotthetransducertoeach
individualvessel.Also,whenapplicable,theinstallationshipyardmusthavethe
drawingsandinstallationapprovedbythepropermaritimeauthorities.

ThedrawingsspecicfortheES38-12transducerarelocatedintheDrawingleon
page33.

Technicalspecications

RefertotheSimradES38-12datasheet.Youcanreadand/ordownloadthedatasheeton

t t p : / / w w w . s i m r a d . c o m .

h

Additionalpartsprovidedforinstallation

ThefollowingitemscanbesuppliedbySimradtofacilitateinstallation.Theitems
mustbeorderedseparately.

•Mountingplate:499–111492

6

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Wheretomountthetransducer

Wheretomountthe

transducer

Asingleanswertothequestionwheretolocatethetransducercannotbegiven.It
dependsverymuchonthevessel’sconstruction,howthehullisshapedandhowthe
waterrunsalongthehull.Therearehoweveranumberofimportantguidelines,and
someoftheseareevenconicting.

Mountthetransducerdeep

Mountthetransduceratadeeppositiononthehull.Considerthesituationswhenthe
vesselisunloaded,andwhenitispitchinginheavyseas.

Thereareseveralreasonsforthis.

1Theupperwaterlayersoftheseacontainamyriadofsmallairbubblescreatedbythe

breakingwaves.Inheavyseastheupper5to10metresmaybelledwithair,and
thehighestconcentrationswillbenearthesurface.Airbubblesabsorbandreectthe
soundenergy,andtheymayinworstcasesblockthesoundtransmissionaltogether.

2Anotherreasontogodeepisthecavitationinfrontofhighpowertransducers.

Cavitationistheformationofsmallbubblesinthewaterduetotheresultinglocal
pressurebecomingnegativeduringpartsoftheacousticpressurecycles.The
cavitationthresholdincreaseswiththehydrostaticpressure.

3Thetransducermustneverbeliftedfreeofthewatersurface.Transmittinginto

openairmaydamagethetransducerbeyondrepair.Mountingthetransducerata
deeppositiononthehullpreventsthis.

4Ifthetransducerisliftedupfromthewaterduringheavyseas,itmaybedamaged

whenthehullstrikesbackattheseasurface.Thisisespeciallyimportantforlow
frequencytransducerswithlargefaces.

Mountthetransducerawayfromprotrudingobjectsonthehull

Objectsprotrudingfromthehull,suchaszincanodes,sonartransducersoreventhe
vessel’skeel,generateturbulenceandownoise.Holesandpipeoutletsarealso
importantnoisesources.Theymayactasresonantcavitiesamplifyingtheownoise
atcertainfrequencies.Donotplaceanechosoundertransducerinthevicinityofsuch
objects,andespeciallynotclosebehindthem.Forthesamereason,itisveryimportant

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SimradES38-12

thatthehullareaaroundthetransducerfaceisassmoothandlevelaspossible.Even
tracesofsealingcompound,sharpedges,protrudingboltsorboltholeswithoutlling
compoundwillcreatenoise.

Mountthetransducerattheforwardpartofthehulltominimisetheeffectsfrom
theboundarywaterlayer

Whenthevesselforcesitswaythroughthesea,thefrictionbetweenthehullandthe
watercreatesaboundarylayer.Thethicknessoftheboundarylayerdependsuponvessel
speedandtheroughnessofthehull.Objectsprotrudingfromthehull,anddentsinthe
hull,disturbtheowandincreasethethicknessoftheboundarylayer.Theowinthis
boundarylayermaybelaminarorturbulent.Alaminarowisanicelyordered,parallel
movementofthewater.Aturbulentowhasadisorderlypattern,fullofeddies.The
boundarylayerincreasesinthicknesswhentheowgoesfromlaminartoturbulent.The
gurebelowillustratestheboundarylayerofavesselmovingthroughthewater.

Furthermore,airbubblesintheseawaterarepresseddownbelowthehullandmixed
intotheboundarylayer.Theboundarylayeristhinunderneaththeforwardpartofthe
vessel,andincreasesinthicknessasitmovestowardsaft.Ifthesidesofthehullare
steep,someoftheairbubblesintheboundarylayermayescapetotheseasurfacealong
thevesselsides.Itisourexperiencethatawideandatbottom,witharisingangleless
thanaround13degrees,ispronetogivingairproblemsforthetransducer.Inanycasea
transducerlocationintheforwardpartofthehullispreferredinordertominimisethe
inuenceoftheboundarylayer.

Figure1Boundarywaterlayer

ATurbulentow

BLaminarow

CAirbubblesinthewater

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Wheretomountthetransducer

Mountthetransducerfarawayfromthepropellers

Thepropulsionpropelleristhedominantnoisesourceonmostshingvessels,research
vessels,merchantvesselsandpleasurecrafts.Thenoiseistransmittedthroughthesea
water.Forthisreason,thetransducershouldbeplacedfarawayfromthepropeller,
whichmeansontheforepartofthehull.Positionsoutsidethedirectlineofsightfrom
thepropellerarefavourable.Onsmallvesselswithshortdistancesitisadvisedtomount
thetransduceronthatsideofthekeelwherethepropellerbladesmoveupwards,because
thepropellercavitationisstrongestontheotherside.Thecavitationstartsmosteasily
whenthewaterowsinthesamedirectionasthepropellerblade,andthatistosome
degreethecaseatthatsideofthekeelwherethepropellerbladesmovedownwards.

Mountthetransducerfarawayfromthebowthrusters

Bowthrusterpropellersareextremelynoisy.Wheninoperation,thenoiseandcavitation
bubblescreatedbythethrustermaketheechosounderuseless,almostnomatterwhere
thetransducerisinstalled.Andwhennotinoperation,thetunnelcreatesturbulence,
andifthevesselispitching,thetunnelmaybelledwithairoraeratedwaterinthe
upperpositionandreleasethisinthelowerposition.Ingeneral,alltransducersmust
bethereforeplacedwellawayfromthebowthruster.However,thisisnotaninvariable
rule.Certainthrusterdesignscombinedwithitsphysicallocationonthehullmaystill
offersuitabletransducerlocationsnearthethruster.Ifyouareindoubt,consultanaval
architect.

Mountthetransducerwithaslightlyinclinedtransducerface

Ideally,thetransducerfaceshouldbemountedinparallelwiththeseasurfacewhen
thevesselisinnormaltrim,asthiswillprovidethemostaccurateechoinformation.
However,itisalsoveryimportantthatthew

a t e r  o w overthetransducerfaceislaminar.
Inordertoensurelaminarow ,thetransducerfacemaybetiltedslightlyupwardsin
relationtothewaterow.Thisallowstheowingwatertomeetthefacedirectly,and
assureslaminarow.Theinclinationanglemusthoweverbedeterminedcarefully.The
anglemustbesmallontransducerswithnarrowbeamangles.Asaruleofthumb,mount
transducerswithbeamanglessmallerthansevendegreeswithminimuminclination
angle.Thesmallerbeamangleyourtransducerhas,thesmallertheinclinationanglecan
be.Ensurethatyoudonotmountthetransducerwithanegativeinclinationangle.This
maycauseturbulenceunderthetransducerface,andreducedechosounderperformance.

Summaryandgeneralrecommendations

Someoftheaboveguidelinesareconicting,andeachcasehastobetreatedindividually
inordertondthebestcompromise.Generallythepropellernoiseisthedominantfactor,
andarecommendedtransducerlocationisintheforepartofthehull,withmaximum
distancefromthebowequaltoonethirdofthetotallengthofthehullatthewaterline.

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Figure2Generalrecommendationfortransducerlocation

ATransducer

BInclinationangle

CHulllengthat

waterline

DMaximum1/3of

thehulllengthat
waterline(C)

Ifthevesselhullhasabulbousbow,thismaywellbeagoodtransducerlocation,but
alsoheremustbetakenintoconsiderationtheowpatternoftheaeratedwater.Often
theforemostpartofthebulbispreferable.

Figure3Recommendedlocationofthetransducer
onabulboushull

AThruster

BTransducerlocation

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Howtoinstallthetransducer

Howtoinstallthetransducer

Therearemanydifferentwaystomountthetransducer.Thesearetherecommended
methodstomountalargeandmediumsizedtransducerusingamountingplate.

Topics

•Transducerinstallationinblisteronpage11

•Transducerinstallationinboxkeelonpage15

•Transducerushmountedinasteeltankonpage16

•Transducerwithacousticwindowonpage17

•Transducermountedinsidethehullonpage18

•Transducermountedonadropkeelonpage19

•Retractabletransduceronpage20

Transducerinstallationinblister

Onerecommendedtransducerinstallationmethodisbymeansofablister.Theblister
mustbedesignedandmanufacturedbytheinstallationshipyardtotboththetransducer
body,andthevessel’ssizeandhullshape.

Useamountingplatewheneverprovided

Certaintransducersmaybeprovidedwithamountingplate,orwithdrawingstoallow
forlocalproductionofthis.

Themountingplateisweldedtotheholepreparedforthetransducer.Boltsthroughthe
transducerbodyintothemountingplatewillsecurethetransducer.

Smoothsurfaceisimportant

Mountingscrewsorboltsmustnotbeextrudingfromthetransducerorthearea
immediatelyaroundit.

Makesurethatthesurfaceofthetransducerface,theinstallationhardwareusedtomount
it,thehullplatingandtheputtyaroundthetransducerisasevenandsmoothaspossible.
Obstructionsonthesesurfaceswillcreateproblemswithturbulentow.

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Example:Largecirculartransducer

Theillustrationbelowshowsatypicaltransducerblisterdesignedforalargetransducer.
Notethatduetothephysicalsizeofthetransducer,aU-shapedsupportbar(E)isused
tosupportthetransducer.Thepurposeofthissupportistopreventthetransducerfrom
beingpushedupintotheblisterinheavyseas.

Figure4Largecirculartransducer

AStreamlinedblister

BStiffeningrib

CDrainageholes

DInclinationangle

EU-shapedsupportbar(recommended

onlargetransducers)

FForward

GCableserviceloop

HStufngtube

IMinimum400mm

JRoundedcorners

KAiroutlet

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