381298/C
89
Context
The different uses of the SN90 offer the following choices:
•
For purse seining
: The transducer must face port or starboard to cover the fishing gear.
•
For trawl
: The transducer must face forward.
•
For navigation
: The transducer must face forward.
Note
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.
For purse seiners, the transducer must be pointed slightly downwards, and towards the
fishing gear. Typical installation angles on previous vessels have been:
• Rotation around the Y-axis: 75 to 80 degrees
• Rotation around the Z-axis: 70 to 80 degrees
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
For use as a navigation instrument, the transducer must be tilted slightly downwards.
Typical installation angles on previous vessels have been:
• Rotation around the Y-axis: 60 degrees
• Rotation around the Z-axis: 0 degrees
Procedure
1
Using available literature, experience and the vessel drawings, decide the physical
location of the transducer.
2
Determine the installation method for the transducer:
a
Blister
b
Keel box
c
Through the hull plating
3
Determine the method for safe cable penetration.
a
Trunk and sealing plate
b
Steel conduit through the hull and up above the water line
c
A combination of both these methods
Summary of Contents for Simrad SN90
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Page 117: ...381298 C 115 Related topics Installation summary page 65 Installing the transducer ...
Page 236: ...234 381298 C 372915 Clamping frame Simrad SN90 ...
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Page 296: ... 2016Kongsberg Maritime ISBN 978 82 8066 179 1 ...
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