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A
Keel
Transducer
B
blister
C
Horizontal
distance
between keel
and blister
D
Vertical
distance
between the
blister surface
and the keel
Transducer installation in box keel
307324/B
Physical location
The blister is placed on one of the sides of the hull, and the
distance from the keel is a trade off between a close distance
giving a turbulent flow of water in a narrow passage, and a large
distance bringing the transducer higher up and also more affected
by vessel roll. Normally a distance of approximately 1 m is a
good compromise.
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 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.
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 and clamping rings whenever
provided
Circular transducers may be provided with mounting and
clamping rings, or with drawings to allow for local production
of these. The mounting ring is welded to the hole prepared for
the transducer, while the clamping ring fits around the edge of
How to install the transducer
17
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