Bedienungsanleitung SEAFARER 700 (Seite 3 von 14) (Englisch)

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INSTALLATION AND OPERATING

INSTRUCTIONS

INTRODUCTION

The Seafarer echo sounder operates by measuring the time interval between transmission and reception of ultra-sonic pulses from

the sea bed via a piezo electric transducer fitted in the hull of the boat.

The depth is displayed on a circular dial by a brilliant yellow Light Emitting Diode (LED) on three range scales. Ranges are

0—20m, 0—60m and 0—200m on metric model or, 0—60ft, 0—60 metres and 0-100 fathoms on Feet/Fathoms model. In

addition, the instrument is fitted with two variable depth alarms (audible and visual) which operate between a minimum of 2.7

feet and maximum of 29 metres (nominal).

TRANSDUCER INSTALLATION

WARNING: The co-axial cable is sealed into the stem of the transducer and if damaged in any way cannot be reconnected. The

transducer lead has a nominal length of 24 feet (7.3 metres) and should not be extended or cut without the advice of a service

engineer. Any excess cable should be coiled away from excessive heat or sources of electrical interference. Transducers with

longer cable can be supplied to special order. For full depth performance the transducer stem should be mounted as near vertical

as possible. Install the transducer in a part of the hull which is as clear as possible from aerated or turbulent water and where

accidental damage is unlikely to occur. Normally a position slightly aft of amidships is preferable. For fin-keel sailing boats it

may be preferable to fully recess the transducer into the stem so that the face is completely flush. It should be remembered that

the beam angle of the transducer is ±22½

and care should be taken that a false echo is not created by the keel. If a single

transducer is installed on the centre line of the boat depth readings will be obtained up to an heel angle of 22½

. If two

transducers are required, to avoid fin-keels for instance, then each should be fitted in opposite bilges facing outward at an angle

of approximately 15

. By using an automatic changeover switch (optional extra) available from all good chandlers, a twin

transducer installation will enable the Seafarer 5 and 700 to give accurate depth readings to an heel angle of 37½

The following illustration indicates typical transducer installations using a wooden fairing block outside the hull. The fairing

block has been carefully bored, carved and sanded to a streamlined shape avoiding the creation of turbulent water which may

reduce or even prevent depth indication when the boat is travelling at a speed. In one of the examples shown, an internal fairing

block has been used for strength and sealing and to allow for hull curvature. The installation should be carefully rendered

watertight by using a sealing compound between all mating surfaces. Do not over-tighten the nuts on the transducer stem.

Fig 1

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