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Transducer installation
175
857-164342 / Rev.C
sounder useless, almost no matter where the transducer is
installed. And when not in operation, the tunnel creates
turbulence, and if the vessel is pitching, the tunnel may be filled
with air or aerated water in the upper position and release this in
the lower position. Therefore, an echo sounder transducer
should be placed well away from the bow thruster.
Vessel heave
Heave is the up and down movement of the vessel. It disturbs
the echo traces in the echogram, so that a flat bottom is
displayed as a wave. A transducer location in the middle of the
vessel minimises the influence of vessel roll and pitch.
Noises from protruding objects on the hull
Objects protruding from the hull, such as zinc anodes, sonar
transducers or even the vessel’s keel, generate turbulence and
flow noise. Also holes and pipe outlets are noise sources. They
may act as resonant cavities amplifying the flow noise at certain
frequencies. Do not place an echo sounder transducer in the
vicinity of such objects, and especially not close behind them.
Figure 17 Recommended location of the transducer on the
hull
(CD1997C)
L
Max 1/3 L
Approximately 3 degrees tilt