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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
•
Keep the following points in mind when
choosing a 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. 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
3. 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.
3. Press the [MODE] key to choose
SINGLE FREQ.
4. Choose 50 kHz or 200 kHz, and then
press the [MENU/ESC] key to close the
mode menu.
5. Press the [PROG] key to show the
pop-up window for automatic/manual
selection.
6. Press ▲to choose Manual.
7. Press the [MENU/ESC] key..
8. Press the [GAIN] key to set the gain to
“5” and then press the [MENU/ESC] key.
9. Press the [RANGE] key to set the range
to 10 meters (feet) and then press the
[MENU/ESC] key.