1-1
1. HOW TO INSTALL THE SYSTEM
1.1 Hull Unit (FSV-253/FSV-254)
Note 1: The raise/lower control box on the hull unit contains a motion sensor. Handle
the hull unit carefully.
Note 2: Handle the transducer carefully. Rough handling can damage its sensitive
components.
1.1.1 Installation considerations
Decide the location of the hull unit through consultation with the dockyard and ship
owner. When deciding the location, the following points should be taken into account.
• Select an area where propeller noise, cruising noise, air bubbles and interference
from turbulence are at a minimum. Generally, the point at 1/3 to 1/2 of the ship's
length from the bow on the keel is optimum. On-the-keel installation is
advantageous for minimizing oil consumption. For large ships with deep draft, the hull
unit can be installed at the bow, along the keel line. (See figure below for reference).
• For installations where there are other transducer tanks along the keel, install the hull
unit a minimum distance of three times the internal diameter of the tank directly in
front (bow direction) of the hull unit. Failure to install the hull unit with sufficient
spacing can result in excessive vibrations caused by turbulence, which can damage
the hull unit. (See figure above for reference).
• Select a place where the hull bottom is flat and the draft is sufficiently deep.
Normally, the transducer should protrude at least 500 mm beyond the keel to
minimize the effect of air foam and bubbles.
• Select a place where interference from other transducers is minimal. The hull unit
should be at least 2.5 m away from the transducers of other equipment.
• No obstacle should be in the fore direction since it causes a shadow zone and
aerated water, resulting in poor sonar performance.
• The physical distance between the hull unit and the transceiver unit should be no
more than 5 m.
• In the case of a bilge keel, select a location as far from the bilge as possible, but no
more than 5 m from the transceiver unit.
• Select a location away from indents and protrusions on the hull, especially indents,
as they can create noise interference and cause poor sonar performance.
• The space shown in the figure on the next page is required around the hull unit for
wiring and maintenance.
• If the ambient temperature around the unit will be below 0°C, provide the sonar
compartment with a heater to keep the temperature above 0°C.
1/2
1/3
Mounting range
øD
Tank installation spacing
Bow
3D
or larger
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