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Standard installation
with through hull fitting
Advantage of a through hull installation is,
that there are no doubts if and how well the
sound waves will pass through the hull (com-
pared to a within hull installation).
There are a few points to be considered for
the through hull installation:
be mounted vertically
only a metal through hull
fitting.
Swelling of the wood may over stress the
plastic housing. Also hauling the ves-
sel may over stress and crack the
housing.
3. Do not expose a plastic through hull
transducer to solvents. The
housing might crack and
leak.
hull, make sure that no
water can enter into the
core. This might require
5. Do not use metal hous-
ings on metal hulls. Electrolytic corro-
sion will occur.
Always tighten the lid firmly!
1. The sensor should
and not inclined, nei-
ther sideways nor for-
ward or aft. If the hull
is not level, a fairing
has to be fitted
outside and
inside.
2. In case of
a wooden hull or
wooden fairings, use
4. In case of a cored
bonding of a tube
to the inner and
outer hull, before
installing the trans-
ducer housing.
Within hull installation
This kind of installation is only possible on
compact non porous plastic hulls.
It is not recommended for boats faster than
10 kts.
Steps of installation:
1. The boat must be in the water. A "sonic
window" has to be found in the hull, where
the echo sounder works! The first step is to
find a place where the sound waves can pen-
etrate the hull without losses. This test is ab-
solutely required, because there is no other
way to find out. The vessel must be in the wa-
ter at a place where echoes are not absorbed
by mud or other soft ground. This test can
best be done with the vessel
under way over different sea
bottom.
Remove air bubbles!
Remove paint and insulation
2. Choose a location where the hull is not
very thick. Check also points 1) to 7) listed
under "location of depth transducer". They are
equally valid for a within hull installation.
install the housing at the
location determined. Select
a marine bedding / caulk-
ing compound e.g. Sika
221. Install vertically and
fill with water or oil. The
transducer face must be in
No bubbles under the
transducer!
Not more than 20 mm
from the hull!
38
Provide a provisional
patch of water at the de-
sired location
Plastic hull (not to be
very thick)
3. The third step is to
the fluid even when the
vessel is heeled.
Minimum gap 1 mm
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