SECTION TWO — Installing the transducer

housing

paddle wheel insert

Paint exposed housing and bore up 30mm (1-1/4")

detail

lower O-ring

Paint outside wall below the lower O-ring including exposed end, paddle wheel cavity and paddle wheel

Anti-fouling paint (B744V shown)

FIGURE 4: Anti-fouling paint areas (for Airmar B744V)

CAUTION!

Use special transducer paint. Other paints may contain copper, which is conductive and can burn out the transducer within minutes!

Cleaning a transducer

To clean the transducer of heavy debris or foul sea growth, use a stiff brush or putty knife, but don’t scratch the surfaces. Check the transducer every few weeks, maximum.

Use sanding sparingly, as repeated sanding may affect the transducer’s performance at high speeds. For lighter cleaning, the surface may be wet-sanded with #220 or finer wet/dry sandpaper.

491 INSTALLATION MANUAL Revision A

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NorthStar Navigation 491 installation manual Cleaning a transducer, Detail