Bedienungsanleitung SEAFARER 5 (Seite 3 von 13) (Englisch)

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INSTALLATION AND OPERATING

INSTRUCTIONS

INTRODUCTION

The Seafarer 5 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 two

range scales. Ranges are t)-20m and

0-120m on

metric model or 0-&ft and 0-i0 fathoms on Feet/

Fathoms model. In addition. the instrument is fitted

with a depth alarm (audible and visual) which

operates up to 30 metres (16 fathoms).

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

nterference. Transducers with longer cable can be

supplied to special order. For full depth performance

the transducer stem should he mounted as near

vertical as possible. Install the transducer in a part of

the hull which is as clear as possible from aerated or

Fig. 1

urbulent 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 ±22

and care should he 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 he obtained up to an heel angle of

221/2

If two transducers arc 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 change-

over 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 37'/2

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 he carefully rendered

watertight by using a sealing compound between all

mating surfaces. Do not over-tighten the nuts on the

transducer stem.

Stem Fitting



Bilge

Mounting

Not

Scale



Transducer

Head

Embedded

Mastic

Sealing

Compound

90'

Alt



Fore

Level F,umg to Avoid

Water Turbulence

TRANSDUCER INSTALLATION

DIAGRAM

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