Kongsberg Simrad SN90, Installation Manual

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381298/C
67
Transducer installation principles
The physical installation of the SN90 transducer is basically made in the same way as
for normal echo sounder transducers. However, depending on your intended use of the
SN90, the transducer is installed with a specific angle and direction.
The SN90 transducer is designed to be mounted inside a keel box or streamlined blister
under the vessel’s hull. It can also be mounted using a suitable hole in the hull plating.
Depending on the intended use of the SN90, the transducer must face forward or
sideways.
•
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.
Topics
Installing the transducer for use on purse seiners, page 67
Installing the transducer for use on trawlers, page 70
Installing the transducer for navigational use, page 73
Placing the transducer in the vessel coordinate system, page 76
Watertight integrity, page 81
Installing the transducer for use on purse seiners
When used on a purse seiner, the physical installation of the SN90 transducer is made by
designing a blister or keel box.
For purse seining use, the transducer must be installed facing the side of the vessel.
Installation on starboard or port side depends on the fishing gear arrangement on
the vessel. Which installation method to choose depends on the design and physical
properties of the hull. The blister or keel box must be designed by the installation
shipyard to fit the vessel’s hull. The same blister or hull box may also be used for other
sonar and echo sounder transducers.
The distance from the bow must be determined by the vessel's physical properties, the
location of the fishing gear during the fishing operations, and the desired coverage area.
You must also consider the noise factors.
Installing the transducer