Furuno CH-500 Installation Manual page 21

• 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. If the hull unit cannot be installed on the keel,
the center of the retraction tank should be within 1 meter of the keel to prevent a
rolling effect.
For a wooden vessel: Install the hull unit off the keel.
For other than a wooden vessel: On-the-keel installation is advantageous in com-
parison with off-the-keel.
Mounting range
1/3
1/2
• 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.
• Referring to the outline drawings at the back of this manual, allow sufficient space
for maintenance and service.
• If the ambient temperature will be be-
low 0°C, provide the sonar compart-
ment with a heater to keep the
temperature above 0°C.
The hull unit can not work if the am-
bient temperature is below 0°C.
• Prepare a secure and firm safety
fence for the hull unit, to prevent ac-
cidental injury from the moving hull
unit. The safety fence should be eas-
ily removable for maintenance and
allow room for the connected cables
to swing freely with pitch, roll and
heave. The power switch on the
raise/lower control unit should be op-
eratable from outside the safety
fence.
For a wooden vessel
Retraction tank
Keel
Within 1 m
For other than a wooden vessel
Keel Within 1 m
800
Compartment
Safety fence)
Lt: Tank length
Unit: mm
1. MOUNTING
Retraction tank
500
Bow direction
1-11