Furuno CSH-8LMARK-2, Installation Manual

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1. MOUNTING
1-2
1.1 Hull Unit
1.1.1 Mounting location
Discussion and agreement are required with the dockyard and ship owner in deciding
the location for the hull unit. When deciding the location, take into account the follow-
ing points:
• Select an area where propeller noise, cruising noise, bubbles and interference from
turbulence 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.
Installation location for hull unit
• Select a place where interference from the transducers of other sounding equip-
ment is minimal. The hull unit should be at least 2.5 meters away from the transduc-
ers 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 space shown in the illustration below 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 tempera-
ture above 0°C.
Hull unit maintenance space
1/2 1/3 Within 1 m
400 800
400
800
45˚
BOW
direction