Furuno CSH-7, Installation Manual, Page: 9 / 58

1-2
1.2 Mounting the Hull Unit
Location
Discussion and agreement are required with the dockyard and ship owner in deciding the loca-
tion for the hull unit. When deciding the location, take into account the following points:
• Select an area where propeller noise, cruising noise, bubbles and interference from turbu-
lence are minimal. Generally, the point at 1/3 to 1/2 of the ship’s length from the bow or near
the keel is the best. On-the-keel installation is advantageous for minimizing oil consumption
in comparison with off-the-keel. If the hull unit cannot be installed on the keel, the center of
the retraction tank should be within 1 meter of the keep to prevent a rolling effect.
1/2 1/3
Within 1 m
Figure 1-1 Installation location for hull unit
• Select a place where interference from the transducers of other sounding equipment is mini-
mal. The hull unit should be at least 2.5 meters away from the transducers of other sounding
equipment.
• An obstacle in the fore direction not only causes a shadow zone but also aerated water,
resulting in poor sonar performance. Be sure to locate the transducer well away from any
obstacle in the fore direction.
• The following space is required around the hull unit for wiring and maintenance. If the
transducer is to be operated in ambient temperature below 0
°
C, the sonar compartment must
be provided with a heater to keep the temperature above 0
°
C.
BOW
Direction
400 800
400
800
45°
If the space shown is not available,
leave at least 50 cm in fore
direction.
Figure 1-2 Hull unit maintenance space