Furuno CI-68 Installation Manual page 23

Mounting the transducer for steel hull vessels
To mount the transducer for steel hull vessels, the optional transducer casing (CI-620-
T-S) and thru-hull pipe (CI-620-K-S) are required.
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. If necessary, weld a doubling plate (shipyard supply) to the hull bottom to reinforce
the hull.
3. Unpack the transducer casing and determine the projecting length, making it 250
mm or more. Before cutting the casing, note that the transducer casing has fore-
aft direction. Then, cut it considering the rising angle of the ship's hull.
Note: Weld the casing in parallel with ship's fore-aft line with an accuracy of better
than ±1°. The transducer face should be horizontal at cruising speed.
4. Make a hole for the thru-hull pipe in the hull bottom. Before welding the thru-hull
pipe, remove the rubber packing from the thru-hull pipe. Weld the thru-hull pipe.
Replace the rubber gasket.
5. Make a hole of 10 to 20 mm diameter on the stern side of the casing to allow water
to penetrate the transducer casing.
6. Weld the casing to the hull bottom. Do not remove the transducer fixing flange to
prevent the casing from being deformed.
7. Dismount the fixing flange from the casing. Fix the transducer to the fixing flange.
Transducer fixing flange
Fixing transducer casing
Fixing flange
2. MOUNTING
Transducer casing
Bow
Dimple to bow
Nipple to bow
2-9