Kongsberg Simrad SN90, Installation Manual

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381298/C
85
Installing the transducer cables in a "dry" conduit
A sealing plate is welded to the hull plating, or to a small trunk. This sealing plate (and
trunk) must maintain the watertight integrity of the hull. A steel conduit is welded to
the top of the sealing plate, and terminated above the freeboard deck. This installation
principle requires that you use a SN92 or SN93 transducer without the transceiver
connector readily mounted. On these transducers, each cable is fitted with a cable gland
designed for the sealing plate.
(CD010205_100_004)
A
Transceiver Unit
B Sealing plate
C
Steel conduit
D
Freeboard deck
Steel conduit
The steel conduit must preferably
be straight. Start the conduit
immediately above the transducer,
and terminate it well above the water
line.
Secure the steel conduit to decks
and/or bulkheads with welds.
Note
Observe relevant requirements and guidelines from the classification society, and make
sure that the conduit is properly supported, strong and watertight.
Finalize the steel conduit installation before you pull the transducer cable through it.
Make sure that there are no spatter, sharp edges or protruding objects that can damage
the transducer cables. If a cable is damaged, and penetrated by water, the transducer
will be damaged beyond repair.
Once the transducer is installed, the transducer cables must be pulled through the steel
conduit. If you must introduce bends on the steel conduit, take the minimum cable
bending radius into consideration. Once you have pulled the cable up through the steel
conduit, seal the top of the conduit with a Roxtec (or similar) seal.
Installing the transducer