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Simrad ES38-18/200-18CR Installation Manual
Mounting screws or bolts must not be extruding from the transducer or the plating
immediately around it.
Note
Obstructions on these surfaces will create problems with turbulent flow, and may cause
noise.
Related topics
Smooth surface is important, page 50
Transducer installation using drop keel
If your vessel is fitted with a drop keel, this is a superior platform for the
ES38-18/200-18CR transducer.
Drop keels are often used on larger research vessels. A drop keel will frequently protrude
as far as three meters below the hull. At that depth, the water is free of air bubbles
up, even during very high sea states. The vessel is then able to do reliable acoustic
measurements in open sea a larger part of the year.
At the bottom of the drop keel, the ES38-18/200-18CR can be installed with the
transducer face flushed with the horizontal plating. A protective tank may not be
necessary, since the drop keel will normally offer adequate protection.
The drop keel is normally used for several echo sounder transducers.
The transducer cable must be properly fastened at the bottom of the drop keel, and
supported during the lowering and lifting the drop keel.
Tubular flow
A
Laminar flow
B
Air bubbles in the water
C
Drop keel (extended)
D
E
Several transducers can be installed at the bottom of the drop keel
48
436200/A
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