Furuno CI-68 Installation Manual page 24

2. MOUNTING
8. Pass the transducer cable through the thru-hull pipe. Tighten the cable gland,
leaving 0.5 to 1 m of slack in the cable below the cable gland.
9. Mount the fixing flange with the transducer onto the casing. Take care not to pinch
the transducer cable. Never hold the transducer by the cable. Shock will most as-
suredly damage the transducer.
Mounting the transducer for FRP hull vessels
1. Select a mounting place on the hull bottom. (Since the transducer cable is com-
paratively thick, select a mounting place for the thru-hull pipe where the cable can
be easily led into the cable gland.)
2. Determine the projecting length of the casing, making it at least 250 mm. Cut the
casing, considering the rising angle of the ship's hull, so that the transducer face
is horizontal.
Note: The casing should be parallel with ship's fore-aft line within ±1°, and the
transducer face should be horizontal at cruising speed.
3. Make a hole of 10 to 20 mm in diameter on the stern side of the casing to allow
water to penetrate the transducer casing.
4. Make a hole for the thru-hull pipe on the hull bottom. Allow enough clearance
around the pipe for easy tightening of lock nuts.
5. Fix the thru-hull pipe on the hull plate with double nuts and then apply FRP glue
around the pipe.
6. Before fixing the casing to the hull bottom, clean the hull plate surface with an
electric sander until fiberglass appears, then remove dusts, oils, etc. from surface.
Reinforce both sides of the casing with FRP molding.
2-10
Thru-hull pipe for steel hull
Flange with
piping holes
Welding
Hull bottom
Thru-hull pipe
Rubber gasket
Flat washer
Gland