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(b) If it is found necessary to take the transducer from the housing, first remove the
self tapping screw to allow air into the housing, thus facilitating withdrawal.
(c)
During the season periodically check the oil level in the housing and top up with
castor oil as required.
Use of liquids other than castor oil may damage the
transducer for which Electronic Laboratories (Marine)
Ltd. will
accept
no
responsibility.
(d)
When under way, a constant stream of aerated water passes across the hull of a
vessel.
The thickness of this aerated water generally increases with speed.
A
point may therefore be reached
when. no
ultrasonic sound wave can penetrate the
stream of air bubbles with the result that no depth indications will be received.
INSTRUMENT INSTALLATION.
WARNING:-The location of the instrument should be
at least 2 feet (60 cms.) from a magnetic compass.
With the bracket provided the instrument may be mounted in any position through 360°
(The bracket is designed to be slightly undersize to ensure a good grip on the case).
This
means it can be facing down from a cabin roof, on top of an instrument panel or console,
or side mounted by the chart table.
Bear in mind that it is a sophisticated item of equipment
and should therefore be positioned where it is unlikely to be severely knocked or subjected
to the full force of climatic extremes.
Without using the bracket an alternative method of mounting is to fully recess the instrument
i
nto a panel or bulkhead using the flush mounting flange provided.
Remove the instrument from its case by releasing the four captive screws at the back. Remove
the two side mounting knobs from the case back by undoing the internal fixing nuts.
Using
the outer rim of the case back as a pattern or template, cut the appropriate size hole in the
panel or bulkhead. Insert the flush mounting flange between the front and back of the case
making certain the rubber sealing grommet is seated in its channel. (See paragraph on Power
Supply. below).
Replace the back of the case and tighten (do not overtighten) the four
captive screws.
Pass the back of the case into the hole so that the flange is flush against the
panel.
Secure the flange into position with six screws.
Connect the transducer lead into the
socket marked "transducer" at the back of the instrument.
Key:
I.
Case front.
2.
Case back.
3.
Rubber sealing grommet.
4.
Flange securing screws.
5.
Flush mounting flange.
6.
Bulkhead hole.
7.
Case securing bolts (4).
8
8.
Side
mounting knobs (re-
5
move for flush mounting).
POWER SUPPLY.
The instrument may be powered by either internal batteries or ships
supply of 12, 24 or 32 volts. The back of the instrument must be removed as described
previously in order to connect whatever power source is selected of the two alternatives
given.
Internal batteries.
The recommended battery is the Ever Ready PP9 or its international
equivalent (Berec PP9, Ever Ready 276, Mazda RO 618, Diamon EB 39, Pertrix 439,
Superpila 995, Tudor 9T1).
Re~~tove the battery clips (on red and black leads) from their
stowage position in the set and clip them onto one of the batteries given above.
As an
alternative, two 4.5 volt flat flashlight batteries of the type with two brass contact strips
at the top may be used with an appropriate adaptor.
During the season, periodically check that the battery or batteries show no sign of corrosion
and always remove them at the end of the season. Should the instrument ever need servicing
do not send it through the post with the battery installed.
Internal
battery check.
Provision has been made to check when the internal battery is
becoming exhausted and should be replaced.
The symptoms are as follows:---
On the "xl" range, the neon lamp brilliance will become subdued.
At the same depth, the depth shown on the "xl" range will be less than that shown on the
"x6" range.
The instrument should then operate only on the "x6" range which will continue
3


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