Simrad ES70 - INSTALLATION REV A Installation Manual page 131

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 the
transducer body. Bolts through the clamping ring into the mounting ring will secure the
transducer between them. Note that several transducers use direction guides to allow
correct mounting.
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.
Use a horizontal support bar on large transducers
We strongly recommend that large transducers are fitted with a horizontal support bar.
The purpose of this support bar is to protect the transducer from damage in the event of
slamming. This happens if the vessel hull climbs out of the water in heavy seas. The
force of the water when the hull falls down may push the transducer up and cause damage
to its mounting. The support bar can be secured to the mounting ring using threaded rods.
Slamming is the impact of the bottom structure of a ship onto the sea surface. It
is mainly observed while sailing in waves, when the bow raises from the water
and subsequently impacts on it. Slamming induces extremely high loads to ship
structures and is taken under consideration when designing ships.
Water filled
As for a blister, the interior of the tank must be filled with water.
This can be accomplished by air release through a steel tube, which is extended either
to open air 1.5 m above the water line or to the water outside the hull at a point higher
than the tank interior.
If the tube is extended to open air, drainage must be provided with leakage at the
transducer flange or a separate hole in the tank bottom.
343522/A
Transducer Installation
— Wikipedia
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