Furuno CI-88 Installation Manual page 21

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 assuredly
damage the transducer.
Note: For CI-824/825/827, the following procedure is necessary in addition to the procedure
mentioned above.
Cut the top board of the transducer casing considering the rising angle of the ship's
hull, and then fix it by welding (CI-824/825), or with bolts (CI-827).
Mounting the transducer for FRP hull vessels
1. Select a mounting place on the hull bottom. (Since the transducer cable is comparatively
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.
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.
7. Fix the transducer to the fixing flange.
8. Pass the transducer cable through the thru-hull pipe. Tighten the cable gland, leaving
0.5 to 1.0 m of slack in the cable below the cable gland.
Transducer
Flange
Fixing flange
Fixing plate
Transducer
Transducer and fixing flange
Nipple to bow
Dimple to bow
2. MOUNTING
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