TRANSDUCER ANTI-FOULING
Following installation the water exposed face of the transducer may be painted with one thin coat of hard Antifouling, carefully
applied so that the paint does not form or trap air bubbles. Care should be taken not to damage the transducer face or the piezo
electric crystal that it protects. Accidental damage to this sealed unit cannot be repaired.
WITHIN HULL (GRP) TRANSDUCER INSTALLATION (Optional)
As an alternative to mounting the transducer through the hull with the face in direct contact with the water, it may be positioned
inside a glass-fibre hull by means of an In Hull Transducer Kit as shown in Fig. 2. The In Hull Transducer Kit is available from
most Chandlers and Boatyards, as an optional extra. The end cap of the In Hull Transducer Kit is provided with a push-out insert
making it suitable for the stem diameter of both the Seafarer 5 and 700 transducers. This method of installation has the dual
advantage that no hole is made in the vessel’s hull and that the echo sounder and transducer can easily be removed for
examination or installation elsewhere. It should be mentioned however, that although the accuracy will in no way be affected by
installing the transducer inside the hull, the maximum range sensitivity may be reduced depending upon the thickness and quality
of the glass-fibre. We do not recommend this method of installation if the thickness of the glass-fibre exceeds three-quarters of
an inch. Neither do we recommend its use in hulls of wood, steel or aluminium, although this method of installation has been
found acceptable with these materials in some cases. Full installation details are supplied with the In Hull Transducer Kit and
copies are available on request to Seafarer Navigation International Limited.
INSTRUMENT INSTALLATION
WARNING: The location of the instrument should be at least 2 feet (61 cms) from a magnetic compass.
Repeat meter 1 foot (30 cms).
With the bracket provided the instrument may be mounted in any position, as the bracket can be rotated through 360g. (The
bracket is designed to be slightly undersized to ensure a good grip on the case). This means that it can be facing down from a
cabin roof, or on top of an instrument panel or console, or side mounted by the chart table. If the instrument is mounted outside
or in a cockpit. a sheltered position should be chosen, since although the instrument is water resistant it is not fully waterproof.
For this reason it is advisable to provide a cover or some additional protection against extreme climatic conditions.
FLUSH MOUNTING
An alternative method of mounting is to fully recess the instrument into a panel or bulkhead using a flush mounting flange. The
template provided with the operating booklet may be used for making the appropriate cutout in the bulkhead. Remove the two
plastic side mounting knobs and cut the projecting screw threads back to the metal flange on each side of the instrument case. Fit
the plastic mounting bezel to the instrument by slacking the four fixing screws at the rear of the case sufficient to allow the bezel
(which is in two halves) to be slipped in between the front panel and the case. Re-tighten the four screws trapping the bezel in
position. The instrument can now be pushed into the cutout in the bulkhead from the front and secured with eight countersunk
screws in the bezel. The outline dimensions of the Seafarer for mounting purposes are shown in Fig. 3.
POWER SUPPLY
The instrument may be powered by either an internal battery or ship’s supply of nominal 12/24 or 32 volts D.C. without
adjustment. The rear battery compartment cover must be removed to allow access to the connections. If the instrument is to be
powered from the ship’s supply, attention is drawn to the fact that the internal battery terminals MUST remain stowed in their
stowage position. The unit will not operate on an external supply unless the battery terminals are in the stowage position.
Internal Batteries. The recommended battery is the Ever Ready PP9 or Vidor VT9 or its international equivalent:
Berec PP9 Diamon 339
Ever Ready 276 Petrix 439
Mazda RO 617 Superpila 995 Tudor 9T1
Remove the battery clips (red and black leads) from their stowage position and clip them on to the battery in the correct
polarity. Red to positive (+VE) and black to negative (—VE).
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 the battery or batteries for signs of corrosion and always remove them
at the end of the Season. Should the instrument ever need servicing, remove the battery before posting.
Ships Supply. The instrument will accept any nominal ships supply of 12, 24 or 32 volts D.C. without adjustment. Damage,
however, will be sustained if a higher voltage is connected or if the ships supply produces “peaks” in excess of 35 volts. To
connect the instrument, remove the battery compartment cover and make a small hole in the sealing grommet marked “external
supply” in the back cover. Thread the power supply cables through the grommet and connect the negative supply to the screw
terminal on the instrument marked —VE and the positive supply to the screw terminal marked +VE. The internal battery
terminals MUST remain clipped in their stowage position when the ships supply is connected. If the polarity is inadvertently
reversed no damage will be sustained, but the instrument will not work until the correct polarity is connected. Check the correct
operation of the instrument before re-fitting the rear cover.
