CVR–010
Installation Instructions
80
13.2. Transducer
Installation
13.2.1. General
Precautions
・
The installation should be planned in advance, keeping in mind the standard cable
length integrally connected to the transducer.
・
In an installation where a longer cable is required, it is recommended that the
transducer be ordered with the desired cable length instead of extending the existing
cable with an additional cable.
・
If the existing cable has to be extended, be sure to use the same type of cable supplied
by the manufacturer.
< WARNINGS >
1. DO NOT LIFT THE TRANSDUCER BY HOLDING ITS CABLE OR THE
INTERNAL CABLE WIRING WILL BE DAMAGED DUE TO ITS WEIGHT.
2. THE TRANSDUCER IS A DELICATE PIECE OF ELECTRONICS, AND MUST NOT
BE HIT, DROPPED OR HANDLED ROUGHLY. DAMAGE TO THE TRANS–
DUCER FACE CAN RESULT IN SERIOUS PERFORMANCE DEGRADATION.
< C A U T I ON >
Use of extension cable not approved by the manufacturer will seriously
degrade the transducer performance. Coaxial cables cannot be used.
13.2.2. Choosing Installation Location
・
The transducer location and method of installation will greatly affect the bottom
detecting capability of any echo sounding equipment.
・
Careful consideration must be given to selecting the mounting location and deciding the
method of installation that best suit the vessel.
・
Air bubbles and turbulent streams generated by the vessel in motion will most seriously
degrade the bottom tracking performance.
・
The transducer should be located away from, and forward of, the propellers and shafts,
well clear of any water intake/discharge line, hull openings, outlets, sea chests and any
other projections along the hull that might disturb the smooth flow of water around the
transducer.
・
It is recommended that the transducer be located on the side where the ship’s
propellers will move downwards to prevent them from pushing air bubbles up against
the hull.
<
C A U T I ON S
>
・
Inside–the–hull mounting will cause a serious impedance mismatch between the
transducer and the transceiver. The manufacturer will not guarantee depth
detection performance, if such a mounting method is employed.
・
Do not paint the transducer face, or performance degradation will result.
・
Although the appropriate location depends on the type of hull and cruising speeds, a
practical choice will be somewhere between 1/3 and 1/2 of the vessel’s length from the
fore.
・
The transducer should be installed on, or close to, the vessel’s centerline. On
deep–keeled vessels, care must be taken to ensure that the energy beam (shown in
Table 13–1 in paragraph 13.2.5)
of the transducer will not be blocked by the keel.
・
If depth from the keel (
DBK
)
is to be read, be sure to measure, and take a note of, the
keel offset (distance from the transducer face to the keel in vertical plane) at this step. See
paragraph 8.10.7.3 for related information.
・
There should be sufficient space inside the hull to allow access to the transducer
housing, cable, stuffing tube, etc.
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