Kongsberg Simrad SN90, Installation Manual

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381298/C
71
(CD010205_090_003)
+Z
V
+X
V
This illustration shows the vessel from the side. Observe the Z and X axis.
A Installation angle around the Y-axis
B
Steel conduit terminated above the water line (relevant for "dry" and "wet" conduit
installations)
As an option, the transducer can be installed on the vessel’s bow. This installation
method must be carefully designed to minimize the effect the transducer will have on
the hull behaviour and noise conditions.
Note
This installation method will place the transducer at risk - especially on small vessels -
with regards to ice and objects floating in the water. Heavy seas may also lift the bow up
and above water, which will cause the SN90 to transmit into open air.
Physical installation angles
For use on trawlers, the transducer must be tilted slightly downwards. Typical installation
angles on previous vessels have been:
• Rotation around the Y-axis: 30 to 45 degrees
• Rotation around the Z-axis: 0 degrees
When you decide on rotation around the Y-axis, consider the tilt range offered by the
SN90: +10 to -90° in 1° steps. Make sure that the physical installation angle does not
allow the hull to create a shadow for the SN90 beams when minimum tilt is chosen in
the user interface.
Installing the transducer