NorthStar Navigation 491 installation manual Installing the transducer, Lwl

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Installing the transducer

SECTION TWO — Installing the transducer

pressure waves

1/3 aft

 

LWL

150-300mm

(Load Waterline Length)

(6-12")

displacement hull

outboard and I/O

planning hulls

inboard

 

step-hull

fin keel sailboat

full keel sailboat

Best location for the transducer

FIGURE 1: Recommended installation locations for a transducer

A flat-bottom hull provides the best environment for mounting the trans- ducer: It provides a horizontal surface and a constant water flow over the transducer, with little turbulence (see Figure 2 for the recommended transducer incline angle). If the vessel has a deadrise angle greater than 5 degrees, mount the transducer on a fairing block to create a horizontal surface and keep the transducer perpendicular to the waterline (see Figure 3). You must order the fairing block, if needed, from the trans- ducer’s manufacturer.

491 INSTALLATION MANUAL Revision A

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Contents Echo Sounder Installation Manual Page Table of Contents Page Who should read this manual Scope of this manual Section ONE IntroductionWelcome to the Northstar 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 transducerFor the 961/962 Initial checkoutTurning the 491 on For the 957/958/6000i Installation test checklistSetting up the echo sounder Turning the 491 offStatus 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