Inside-Hull; Thru-Hull - Hondex HDX-121 Operation Manual

1 INSIDE-HULL

Effective for FRP vessels with single hull layer of 10mm or less.
Size and shape vary for each transducer.
Look for the best picture location before the fixation by putting adequate water on
the transducer surface and vessel bottom followed by pressing the transducer onto
the vessel bottom.
1 Polish the adhesive surface (transducer bottom surface and vessel bottom)
well with sandpaper (#240 or around) and alcohol in order to remove oil,
water, and dirt on the surface.
2 Put silicon bond on the adhesive surface (transducer bottom surface and
vessel bottom) and press firmly for the bonding so that no air bubble is
contained inside.

2 THRU-HULL

(1) Make hole of
the installation for the risk of corrosion.)
(2) Insert the screw part of transducer into the hole and fix it with 1pc cork
washer, 1pc washer, and 1pc nut. (Extra cork washer is for spare.)
Execute the waterproof care for the junction part.
For tilted hull, use a block etc to face directly to the vessel bottom.
Size and shape vary for each transducer.
25 at the vessel bottom. (Aluminum vessels are not subject to
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