Kongsberg Simrad SU90 Operator's Manual page 199

• Personal protection
• Fresh water
• A mild synthetic detergent and a plastic brush
• Fine-grade sandpaper (240 inch grit size)
• Primer
• Anti-fouling paint
Note
Because some paint types may be aggressive to the polyurethane in the transducer,
consult our list of approved paints.
• Wet film gauge
• Airless spray
Two persons are needed to do the task.
• One person must stay in the sonar room to operate the hull unit.
• One person must stay in the dry dock, under the hull, to make sure that the transducer
is not lowered too far down.
Proper oral communication must exist between the sonar room and the dry dock
personnel.
Context
The transducer has not been designed with any protection against biological fouling.
Anti-fouling paint may therefore be applied to the transducer face. To minimize the
negative acoustical effects the layer of anti-fouling paint must be as thin as possible.
Note
The anti-fouling paint will reduce the acoustical performance of the transducer. The
surface roughness of the transducer substrate and the thickness of the paint may also
influence the performance. Kongsberg Maritime cannot be held responsible for any
negative consequences of the anti-fouling paint.
Observe the relevant instructions and safety information provided by the paint
manufacturer.
Procedure
1 Make sure that all power to the hull unit is disconnected.
2 Use the hand crank to lower the transducer.
3 Clean the transducer thoroughly.
Make sure that you remove all oil grease residues, as well as salt and other
contamination.
381291/D
Maintenance procedures
197