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Figure 8 Physical location of blister
be approximately 1 meter. The vertical distance (D) must in general be as small as
possible. This is important to prevent the keel from shadowing the transducer beam
in shallow waters.
Transducer installation in box keel
Vessels with a box keel may use this for transducer installation.
The box keel is already the deepest part of the vessel. If the box keel is too narrow to
accommodate the transducer, it can be widened, either symmetrically or to one side only.
In the last case the installation could also be described as a blister merged into the keel.
Use mounting plate whenever provided
Certain transducers may be provided with a mounting plate, or with drawings to allow
for local production of this.
The mounting plate is welded to the hole prepared for the transducer. Bolts through the
transducer body into the mounting plate will secure the transducer.
Smooth surface is important
Mounting screws or bolts must not be extruding from the transducer or the area
immediately around it.
Make sure that the surface of the transducer face, the installation hardware used to mount
it, the hull plating and the putty around the transducer is as even and smooth as possible.
Obstructions on these surfaces will create problems with turbulent flow.
344276/A
How to install the transducer
A
Keel
B
Transducer blister
C
Horizontal distance between keel and
blister
D
Vertical distance between the blister
surface and the keel
Observe the horizontal and vertical
distances (C and D) between the keel and
the transducer blister. On a medium sized
vessel, the horizontal distance (C) should
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