Smooth Surface Is Important; Water Filled; Example: Flush Mounting In A Steel Tank - Simrad 38-200 COMBI W - INSTALLATION REV D Installation Manual

Simrad 38/200 Combi W
Figure 7 Flush mounting in a steel tank
Steel tank
A
Water
B
C Drainage hole
D Cable service
loop
Steel tube for
E
air outlet
F Stuffing tube
Cable in steel
G
conduit
16
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.

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.

Example: Flush mounting in a steel tank

Transducer mounting in a steel tank is shown in the figure below.
164986/D