Furuno CH-500, Руководство по установке

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AP-8
APPENDIX 3 HOW TO INSTALL THE
RETRACTION TANK FOR WOODEN
VESSEL
Install the retraction tank for wooden vessel (prepared in APPENDIX 2) as shown here.
Installation location considerations
Discussion and agreement are required with the dockyard and ship owner in deciding the location
for the retraction tank (hull unit). When selecting the installation location, consider the following
points:
• Select an area where the noise and interference are minimal.
The point at 1/3 to 1/2 of the ship’s length from the bow or near the keel is the best. The center
of the retraction tank should be within 1 meter of the keel to prevent a rolling effect.
• Install the retraction tank off the keel.
Do NOT install the retraction tank on the keel and mounting hole for the retraction tank should
not be contact with the keel.
• Select a place where interference from the transducers of other equipment is minimal.
The hull unit should be at least 2.5 meters away from the transducers of other sounding equip-
ment.
• Select a place where no obstruction should be around the full-lowered transducer.
No obstruction should be in the fore direction since it causes a shadow zone and aerated water,
resulting in poor sonar performance.
• The distance between the bottom line of the keel and retraction tank should be 50 mm.
When the distance between the bottom line of the keel and retraction tank is more than 50 mm,
the echo beam may be interrupted with the keel or other ship’s bottom structures.
Mounting range
1/2
1/3
Keel
Within 1 m
Retraction tank
Echo beam area
Keel
≥ 50
≤ 1000
Bottom line of the retraction tank
Bottom line of the keel