Simrad ES 18 - DATASHEET REV C, Installation Manual

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404770/B
Transducer installation in a blister
In order to install a transducer with a circular housing, one recommended installation
method is by means of a blister. The blister must be designed and manufactured by the
installation shipyard to fit the transducer, as well as the vessel’s size and hull shape.
The transducer may be added to an already existing blister that also holds other flush
mounted transducers.
Illustration:
A Mounting ring
B
Clamping ring
C
Cable service loop
D
Bolt
The best performance is obtained
with a blister height of 40 cm or
more. A streamlined shape and
rounded edges reduce the flow
noise. A vertical leading edge or
front will guide the aerated water
to the sides of the blister.
The orientation of the blister
should follow the water flow.
The interior of the blister must
be filled with sea water. Use
drainage holes in the bottom and
an air outlet on the top. The water
pressure behind the transducer
will then compensate for the
outside pressure during vessel movements in rough sea. This is an important security
precaution to prevent damage to the transducer.
The transducer cable penetrates the hull using a cable gland. This cable gland consists of
a bushing, washers, a rubber gasket and a packing nipple. Leave an adequate loop of
the cable over the transducer body inside the blister for easy mounting or removal of
the transducer.
Simrad ES18 Installation Manual