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Simrad ES38-7 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
Transducer installation principles, page 45
Transducer installation using drop keel
If your vessel is fitted with a drop keel, this is a superior platform for the ES38-7 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 ES38-7 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. When the ES38-7 is
mounted externally, you must always place it aft of the remaining flush mounted transducers.
This is necessary to avoid turbulence.
The transducer cable must be properly fastened at the bottom of the drop keel, and supported
during the lowering and lifting the drop keel.
A
Tubular flow
Laminar flow
B
52
404292/D
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