Furuno TZTL12F Installation Manual page 19

Mounting location
To ensure the best performance, the sensor must be submerged in aeration-free and
turbulence-free water. Mount the sensor close to the centerline of your boat. On
slower heavier displacement hulls, positioning it farther from the centerline is
acceptable.
Allow adequate space above the bracket for it to release and rotate the sensor
up-ward.
Note 1: Do not mount the sensor in an area
of turbulence or bubbles: near water
in-take or discharge openings; behind
strakes, struts, fittings, or hull irregularities;
behind eroding paint (an indication of
turbulence).
Note 2: Avoid mounting the sensor where the boat
may be supported during trailering, launching,
hauling, and storage.
Note 3: For single drive boat, mount on the
star-board side at least 75 mm (3") beyond the
swing radius of the propeller, as shown in the right
figure.
Note 4: For twin drive boat, mount between the
drives.
How to install the bracket
1. Cut out the installation template (enclosed with transducer) along the dotted line.
2. At the selected location, position the template, so the arrow at the bottom is
aligned with the bottom edge of the transom. Being sure the template is parallel
to the waterline, tape it in place.
Warning: Always wear safety
goggles and a dust mask.
3. Using a 4 mm, #23, or 9/64" bit, drill
three holes 22 mm (7/8") deep at the
locations indicated. To prevent
drilling too deeply, wrap masking
tape around the bit 22 mm (7/8")
from the point.
Fiberglass hull: Minimize surface cracking by chamfering the gelcoat. If a
chamfer bit or countersink bit is not available, start drilling with a 6mm or 1/4" bit
to a depth of 1 mm (1/16").
4. If you know your transom angle, the bracket is designed for a standard 13°
transom angle.
11°-18° angle: No shim is required. Skip to step 3 in "Adjustments".
Other angles: The shim is required. Skip to step 2 of "Adjustments".
If you do not know the transom angle, temporarily attach the bracket and sensor
to the transom to determine if the plastic shim is needed.
Height without
speed sensor
191 mm (7-1/2")
Height with
speed sensor
213 mm (8-1/2")
Align template vertically.
Align template arrow with
bottom edge of transom.
1. MOUNTING
Height Height
75 mm (3")
minimum beyond
swing radius
Deadrise angle
Slope of hull
Parallel to
waterline
1-13