Furuno TZTL12F Installation Manual page 15

1.5.3 How to mount a transducer inside the hull
The transducer may also be installed inside the hull on FRP boats. However, this
installation method affects the ability to detect the bottom, fish and other objects
because the ultrasound pulse is weakened when it passes through the hull.
Note: This mounting method should not be used to mount the transducer that
supports the ACCU-FISH
performance is greatly degraded.
Necessary tools
The following tools are required:
• Sandpaper (#100)
• Marine sealant
• Water-filled plastic bag
Remarks on installation
• Do the installation with the ship moored at a dock, etc. The water depth should be
6.5 to 32 feet (2 to 10 meters).
• Turn off the engine.
• Do not power the unit with the transducer in the air, to prevent damage to the
transducer.
• Do not use this method on a double layer hull.
• Before attaching the transducer to the hull, check that the site is suitable, by following
steps 1 to 3 in the installation procedure below.
Installation procedure
The attenuation of the ultrasound pulse varies with the thickness of the hull. Select a
location where attenuation is the lowest.
1. Select 2-3 locations considering the four points mentioned below.
• Mount the transducer at a location 1/2 to 1/3 of the length of your boat from the
stern.
• The mounting location is between 15 to 50 cm from the centerline of the hull.
• 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.
2. Decide the most suitable site from the locations selected.
1) Connect the power cable and transducer cable to the display unit.
TM
and/or bottom discrimination display feature, since
1/2
Centerline
50 cm
15 cm
15 cm
50 cm
1. MOUNTING
1/3
Transducer
mounting
location
1-9