Installation manual

SimradES120-7CD
thesoundenergy,andmayinworstcasesblockthesound
transmissiontotally.Therefore,designthetowedbodysothatit
canoperateindeepwater.
Caution
Observethemaximumoperationaldepthofthe
transducer.Donotexceedthislimitation.
Donotallowthetowedbodytohittheseabed.This
mayinictpermanentdamagetothetransducer(s).
Noisefromprotrudingobjectsonthebody
Objectsprotrudingfromthetowedbody,suchaszincanodes,
sonartransducersorevenarudderorakeel,maygenerate
turbulenceandownoise.Holesandpipeoutletsarealso
possiblenoisesources,asthesemayactasresonantcavities
amplifyingtheownoiseatcertainfrequencies.Donotplace
anechosoundertransducerinthevicinityofsuchobjects,and
especiallynotclosebehindthem.Forthesamereason,itis
veryimportantthatthebodyareaadjacenttothetransducer
faceisassmoothandlevelaspossible.Eventracesofsealing
compound,sharpedges,protrudingboltsorboltholeswithout
llingcompoundwillcreatenoise.
Inclinationofthetransducerface
Ideally,thetransducerfaceshouldbemountedinparallelwith
theseasurfacewhenthetowedbodyisinnormaltrim,asthis
willprovidethemostaccurateechoinformation.However,itis
alsoveryimportantthatthew
a t e r  o w overthetransducerface
islaminar.Inordertoensurelaminarow,thetransducerface
maybetiltedslightlyupwardsinrelationtothewaterow.This
allowstheowingwatertomeetthefacedirectly,andassures
laminarow.Theinclinationanglemusthoweverbedetermined
carefully.Theanglemustbesmallontransducerswithnarrow
beamangles.Asaruleofthumb,mounttransducerswithbeam
anglessmallerthansevendegreeswithminimuminclination
angle.Thesmallerbeamangleyourtransducerhas,thesmaller
theinclinationanglecanbe.Makesurethatyoudonotmount
thetransducerwithanegativeinclinationangle.Thismaycause
turbulenceunderthetransducerface,andreducedechosounder
performance.
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