Transducer Installation Principles - Simrad MS70 Installation Manual

Simrad MS70 Installation Manual

Transducer installation principles

The physical installation of the MS70 transducer is made with the transducer positioned
vertically under the hull.
Theoretically, it is possible to install the transducer in
a blister under the hull, or even through the hull plating.
These are not good solutions. We strongly recommend
that the transducer is installed in a drop keel. Due to the
functionality and scientific results required by the MS70,
the transducer installation must be done with a high degree
of accuracy.
A drop keel is a superior platform for the MS70 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 MS70 transducers is
installed vertically with its face flushed with the keel side
plating. The mounting ring is welded to the hole prepared
for the transducer. Bolts through the clamping ring into
the mounting ring will secure the transducer in place.
The transducer cables must be properly fastened at
the bottom of the drop keel, and fully supported while
lowering and hoisting the drop keel.
The drop keel is normally used for several echo sounder
transducers.
Note
Observe the installation principles.
Installation principles, page 45
Topics
Inclination angle, page 75
Cable protection in drop keels, page 75
Placing the transducer in the vessel coordinate system, page 77
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