Simrad ES38-12 - REV C, Installation Manual, Page: 21 / 46

How to install the transducer
Make sure that the surface of the transducer face, the installation hardware used to mount
it, the hull plating and the putty around the transducer is as even and smooth as possible.
Obstructions on these surfaces will create problems with turbulent flow.
Example: Mounting inside the hull
Figure 12 Mounting inside the hull A Steel tank
B Oil
C Hull plating
D Cable service loop
E Stuffing tube
F Cable in steel conduit
G Hole for oil filling
H Air outlet
The transducer shown in the figure is mounted inside the hull. The tank is filled with oil.
Transducer mounted on a drop keel
The use of a drop keel with the purpose of stabilising the vessel is well known.
Figure 13 Drop keel installation A Instrument keel
shaft
B Lowered position
C Bottom view
A drop keel is also
a superior platform
for echo sounder
transducers. Such
instrument keels have
been built, mainly on
research vessels, often
protruding as far as
three meters below the
hull. At that depth, the
water is free of air bubbles up to very high sea states. The vessel is then able to perform
reliable acoustic measurements in open sea a larger part of the year.
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