Simrad ES120-7C - REV D, Installation Manual, Page: 54 / 98

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330254/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
Blister
B Mounting ring
C
Cable service loop
D
Transducer
E Clamping ring
F
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 cable from each transducer penetrates the hull using a bushing. Leave an adequate loop
of the cable over the transducer body inside the blister for easy mounting or removal of
the transducer.
Simrad ES120-7C Installation Manual