The cable can be cut to the necessary length or extended as required. If
extending the cable, use the same type of cable and conductors to complete
the installation properly.
10. Checking for Leaks
When the boat is placed in the water, immediately check around the bolts
that fasten the transducer to the hull and around the
stuffmg
tube for leaks.
Note that very small leaks may not be readily observable, so it is best not to
leave the boat in the water unattended for more than 3 to 24 hours before
checking it again. If there is a small leak, there may be considerably water
accumulation after 8 to 24 hours. If a leak is observed, the installation
bedding procedure should be repeated to seal the leak. It is not prudent to
installa
transducer and leave a boat in the water
unchecked
for severaldays.
2535 Inside the
Hull
Installations (Fiberglass Hulls Only)
Generally, inside-hull mounting can be useful on fiberglass hulls when the
top speed of the boat is at least 25 knots and drag becomes a factor. Inside
mounting creates less turbulence and the transducer performance can
improve at speeds above 20 knots. However, inside hull mounting fre-
quently results in ultrasonic energy losses of up to 50% or more. So the
transducer must be located where hull is solid fiberglass resin to minimize
sound transmission losses.
Generally its better to test selected areas of the hull
first
before installing
the transducer by
placing
the transducer face against the hull and operating
the echo sounder while checking for satisfactory echo returns. A coupling
medium, such as water, or gel, (Vaseline), should be used to transfer the
sonic energy to the hull more efficiently during the testing. Consult with the
boat dealer or vessel manufacturer if your not sure of the hull construction
or best locations.
Once a satisfactory location is found, always mount the transducer into a
liquid-filled box. Never bond the
25281,
resin housing directly to the hull.
253.6 Steel Hull Installations
For steel hulls Raytheon offers the optional transducer installation kit
M78695 consisting of:
1 each
Steel adapter plate
2 each
3/8”
(9 mm) x 1 l/2” (38 mm) SST bolts
1 each
SST
stuffing
tube assembly
INSTALLATION 30
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