Navman THROUGH HULL AND IN-HULL Installation Manual - page 9
9
Through hull & In-hull transducer installation manual
NAVMAN
1 Select a suitable position for the
transducer and establish how the
transducer should be rotated so that the
axis is as vertical as possible (see section
2-1).
2 Test the transducer at this position
with the boat in the water before
mounting it permanently:
i Partially fi ll a thin plastic bag with
water, place the transducer inside and
close it tightly around the cable
with a tie-wrap.
ii Install the depth instrument as
described in the instrument’s
Installation and Operation manual.
iii Wet the surface of the hull and press
the transducer against the inside of
the hull where you plan to mount the
transducer.
iv Check that the instrument measures
depth correctly and consistently, up
to the maximum depth specifi ed for
the instrument. If necessary, move the
bag around the hull to fi nd the best
position.
3 Choose an adhesive or sealant to glue
the transducer to the hull. Hard epoxies
transmit the transducer signals best but
temperature changes and hull fl exing can
cause delamination. As a compromise,
use a viscous slow cure, fairly rigid epoxy
or Sikafl ex 252 sealant.
3-2 Installing an in-hull depth transducer
4 Ensure the inside of the hull where the
transducer will be mounted is fl at.
Clean, degrease and dry:
the inside of the hull where the
transducer will be mounted
the sloping face of the transducer
5 Fit the transducer:
i Apply the epoxy or sealant to the
middle of the transducer face.
ii Press the transducer into place
on the hull.
iii Twist the transducer back and forth to
expel any trapped air and to expel as
much glue as possible from the joint.
The fi nished joint should be as thin as
possible and not contain any
air bubbles.
Leave the transducer rotated to the
correct angle.
iv Temporarily secure the transducer in
place with tape and wait for the glue
to cure for 24 hours.
Glue