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SEAFARER 3 - 4 Manual

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to indicate a true depth until the voltage is insufficient to operate the light emitting diode. As
soon as possible a new battery should be fitted. Batteries can deteriorate in the shop and ideally
should be tested in the following way: Connect the new battery into the instrument in the
usual
way and switch on to the "xl" range. A voltmeter connected across the terminals
should then register not less than 9.25 volts.
Ships supply
The instrument will accept any ships supply of 12, 24 or 32 volts without
adjustment
Damage will be sustained if a higher voltage is connected or if the ships supply
"peaks" in excess of 40 volts.
Remove the back of the case as described previously and make a small hole in the smaller
rubber grommet, marked "External supply" on the case back. Thread the power supply
cables through the rubber grommet and connect the negative supply to the screw terminal
on the set marked - VE and the positive supply to the screw terminal marked +VE. The
internal battery terminals should remain
clipped in their transit position when ships supply
is
connected.
If
polarity is inadvertently reversed no damage will be sustained but the
instrument will not work until the correct polarity is connected.
Refit the case together
making sure the rubber sealing grommet around the case is correctly in place.
The current demand is approximately 55 m/a on the "x6" range and 100 m/a on the "xl"
range.
GENERAL OPERvTION.
The "xl" range (0-60 feet or 0-18 metres)
is
for
medium or
shallow water work with the "x6" range (0-60 fathoms or 0-108 metres) intended for deep
water echo sounding.
On the Seafarer 3 in North America the "xl" range is 0-60 feet and
the "x6" range is 0-60 fathoms, the metric equivalents being omitted. Similarly on the pure
metric version of the Seafarer 3 the "xl" range is 0-20 metres and the "x6" range 0-120 metres.
Switch to one of the two ranges. A light emitting diode will flash at "0" on the dial.
Advance the sensitivity control in a clockwise direction until a second indication
appears.
This second indication is the depth of water beneath the face of the transducer. If
the sensitivity control is advanced more than is necessary, multiple echoes of the true depth
with appear.
Turn ``e sensitivity control back so that only one echo of sufficient brilliance
is obtained in the interests of both clarity and of battery economy.
To locate fish, advance the sensitivity control beyond that amount normally needed for just
depth indication.
Fish will be indicated by random flashes at their appropriate depth,
The efficient performance of all echo sounders depends very greatly upon external factors.
For irstance. a hard, rocky or firm sand sea bed will reflect back ultrasonic sound waves
extremely well
The characteristic echo will be shown as a clear thin line of light on the
dial.
0:. the ether hand deep mud or a seabed with a lot of seaweed will give poor reflection
and wi!I adversely affect instrument performance.
With practice it is therefore reasonably
easy tc ascertain,
no:
only the actual depth, but also the type of seabed.
Under ideal con-
ditions th.- Seafarer 3 is of ample power to far exceed the 60 fathoms (or 120 metres) marked
on the dig,.
this additional depth indication is presented on the dial on a "2nd time round"
basis.
The Seafarer tc fully guaranteed for twelve months against faults other than those caused by
misuse,
in
the country in which it is purchased.
After the guarantee expires, or if problems
arise
which are not covered by the terms of guarantee, your instrument will be repaired in
the
United Kingdom by the manufacturers or one of their officially authorised main dis-
tributors.
Unauthorised or inexperienced persons should not attempt to service the instrument
since this is not only likely to worsen whatever fault has arisen but will immediately nullify
the Guarantee.
Should it ever he necessary to return the instrument for service, it is essential
the internal battery be removed and that the unit be most carefully packed for transit.
A
brief rote (giving your name and address) of the symptoms of failure to operate is of great
assistance to engineers in locating a fault.
TRANSDUCER ANTI-FOULING.
One thin coat of hard racing copper anti-fouling paint
should be used.
When applied with a soft brush, care should be taken not to trap air bubbles
under the paint.
Do not use any other anti-foul paint.
A build-up of barnacles and other marine encrustation on the transducer face will cause
progressive deterioration in instrument
maximum depth indicating capability.
Barnacles
should be removed by crushjfig between a pair of pliers.
Do not tug barnacles off as the
transducer face may become irrepairably damaged. Particles of imbedded shell should be
dissolved away by applying a 20 per cent solution of dilute hydrochloric acid, rinsed off with
fresh water.
TRANSDUCER REPLACEMENT.
Additional or spare transducers as well as automatic
change-over switches manufactured by Electronic Laboratories Ltd. are always available,
ELECTRONIC LABORATORIES LTD.
Fleets Lane, Poole, Dorset
Tel. Poole 4641
Telex 41169 Cables Seatronics Poole
I
nstruction Part No. 7130
4


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