Simrad EC150-3C, Installation Manual

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Smooth surface is important
Make sure that the surface of the transducer face, as well as the plating and putty around
the transducer is as even and smooth as possible. Obstructions on these surfaces will
create problems with turbulent flow, and may cause noise.
Mounting screws or bolts must not be extruding from the transducer or the plating
immediately around it. Obstructions on these surfaces will create problems with
turbulent flow, and may cause noise.
The space around the threaded rods (or mounting bolts) must be filled with a a suitable
filling compound (putty) and/or a locking ring. This is important to secure a firm
installation and a level and smooth surface.
Note
Obstructions on these surfaces will create problems with turbulent flow, and may cause
noise.
Related topics
Transducer installation principles, page 34
Installation summary, page 30
Using a suitable inclination angle
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 water flow over the transducer face is laminar.
In order to ensure laminar flow, the
transducer face must be tilted slightly
upwards in relation to the water flow. This
allows the flowing water to meet the face
directly, and reduces laminar noise.
The inclination angle must be determined
carefully. The angle must be small on
transducers with a narrow beam angles. As a rule of thumb, mount transducers with
beam angles smaller than seven degrees with 1
°
inclination angle. The smaller beam
angle your transducer has, the smaller the inclination angle can be.
Note
Ensure that you do not mount the transducer with a negative inclination angle. This may
cause turbulence on the transducer face, and reduced EC150-3C performance.
Related topics
Transducer installation principles, page 34
Installation summary, page 30
Simrad EC150-3C Installation Manual