Installation manual

Transducer Installation
upper position and release this in the lower position. Therefore,
an echo sounder transducer should be placed well away from
the bow thruster.
Inclination of the transducer face
Ideally, the transducer face should be mounted in parallel with the
sea surface when the vessel is in normal trim, as this will provide
the most accurate echo information. However, it is also very
important that the w
ater flow over the transducer face is laminar.
In order to ensure laminar flow, the transducer face may be tilted
slightly upwards in relation to the water flow. This allows the
flowing water to meet the face directly, and assures laminar flow.
The inclination angle must however be determined carefully. The
angle must be small on transducers with narrow beam angles. As
a rule of thumb, mount transducers with beam angles smaller
than seven degrees with minimum inclination angle. The smaller
beam angle your transducer has, the smaller the inclination angle
can be.
Ensure that you do not mount the transducer with a negative
inclination angle. This may cause turbulence under the transducer
face, and reduced echo sounder performance.
Summary and general recommendation
Some of the above guide lines are conflicting, and each case has
to be treated individually in order to find the best compromise.
Generally the propeller noise is the dominant factor, and a
recommended transducer location is in the fore part of the hull,
with maximum distance from the bow equal to one third of the
total length of the hull at the water line.
(CD017004Q)
BA
L
M
General recommendation for transducer location:
(A) = Transducer
(B) = Inclination angle
(L) = Hull length at water line
(M) = Maximum 1/3 of the hull length at water line (L)
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