NorthStar Navigation 491 installation manual Cleaning a transducer, Detail

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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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Contents Echo Sounder Installation Manual Page Table of Contents Page Welcome to the Northstar Section ONE IntroductionWho should read this manual Scope of this manual Installation considerations Safety considerations Section TWO Installing the transducerAirmar transducer elements Northstar-recommended transducersDo not mount the transducer Choosing a mounting locationHull thickness limits LWL Installing the transducerLWL Using anti-fouling paintDetail Cleaning a transducerPage Section Three Installing Section Three Installing Installation Manual Revision a Echo sounder system components with the Northstar 961/962 System components190 dia 360 dia MountingConnecting the 491 to the 961/962 WiringInterface cable connection from 961/962 to Cable connection between the 961/962Connecting the 491 to the 957/958 491-to-transducer connector pin wiring Connecting the 491 to a transducerTurning the 491 on Initial checkoutFor the 961/962 Setting up the echo sounder Installation test checklistTurning the 491 off For the 957/958/6000iStatus LED Section Four Troubleshooting and servicing961/962 echo sounder system troubleshooting 957/958/6000i echo sounder system troubleshooting Contacting Northstar Getting technical supportHearing from you Ordering replacement parts ServicingReturning a 491 for service 491 technical specifications Appendix a Technical specificationsON/OFF Cavitation Deadrise Echo sounder Fairing block Transducer GlossaryGlossary Installation Manual Revision a Index 491 Index Index Installation Manual Revision a