Simrad ES 18 - DATASHEET REV C, Installation Manual

Page: 58 / 88

56
404770/B
Note
Make sure that the "Forward" direction on transducer points in the forward direction
of the vessel.
A suitable mounting ring can be provided by Kongsberg Maritime. A drawing is
available for local manufacturing. End user manuals and source drawings (normally in
AutoCad format) can be downloaded from our website.
• https://www.simrad.com
Smooth surface is important
Make sure that the surface of the transducer face, as well as the plating and putty around
the transducer is as even and smooth as possible.Obstructions on these surfaces will
create problems with turbulent flow, and may cause noise.
Mounting screws or bolts must not be extruding from the transducer or the plating
immediately around it.
Note
Obstructions on these surfaces will create problems with turbulent flow, and may cause
noise.
Related topics
Transducer installation principles, page 47
Transducer installation using drop keel
If your vessel is fitted with a drop keel, this is a superior platform for the ES18 transducer.
Drop keels are often used on larger research vessels. A drop keel will frequently protrude
as far as three meters below the hull. At that depth, the water is free of air bubbles
up, even during very high sea states. The vessel is then able to do reliable acoustic
measurements in open sea a larger part of the year.
At the bottom of the drop keel, the ES18 can be installed with the transducer face flushed
with the horizontal plating. A protective tank may not be necessary, since the drop keel
will normally offer adequate protection.
The drop keel is normally used for several echo sounder transducers. When the ES18
is mounted externally, you must always place it aft of the remaining flush mounted
transducers. This is necessary to avoid turbulence.
The transducer cable must be properly fastened at the bottom of the drop keel, and
supported during the lowering and lifting the drop keel.
Simrad ES18 Installation Manual