Furuno Ls4100 - Manual (Page 34)

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2 to 5
Transducer
Bracket
Hull
Epoxy material
525-5PWD, mounting
4.4 Inside-hull
Transducer
The thru-hull mount transducer
(520-5PSD, 520-5MSD) may also be
installed inside the hull, following the
procedure below.
Necessary tools
You will need the following tools:
• Sandpaper (#100)
• Silicone sealant
• Silicone grease
Remarks on installation
• Turn off the engine and anchor the
boat while installing the equipment.
• Install the transducer in the engine
room.
Choosing the mounting location
• The mounting location should be
where the hull is of single-hull
thickness and is void of air or flotation
materials other than solid fiberglass
between the transducer face and the
water.
• Do not place the transducer over hull
struts or ribs which run under the hull.
• Avoid a location where the rising
angle of the hull exceeds 15°, to
minimize the effect of the boat’s
rolling.
• You will finalize the mounting location
through some trial and error. The
procedure for this is shown later.
50 cm
50 cm
15 cm
15 cm
1/3
1/2
Transducer
mounting
location
Centerline
Inside-hull transducer mounting location
Attaching the transducer
1. Clean the transducer face to remove
any foreign material. Lightly roughen
the transducer face with #100
sandpaper. Also, roughen the inside
of the hull where the transducer is to
be mounted.
2. Clean the transducer face again.
3. Warm the silicone sealant to 40°C
before usage to soften it. Coat the
transducer face and mounting
location with silicone sealant.
Transducer
Silicone
Sealant
Coating transducer face
with silicone sealant
4. Press the transducer firmly down on
the hull and gently twist it back and
forth to remove any air which may be
trapped in the silicone sealant.
Checking the installation
1. Connect the battery to the display
unit.
2. Turn on the display unit.