Simrad 398445, Руководство по установке, Страница: 49 / 66

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Transducer installation under a blister
A recommended method for transducer installation is by using a blister. The transducer
blister must be designed and manufactured by the installation shipyard to fit the relevant
transducers, as well as the vessel’s size and hull shape. Creating a blister for a single
externally mounted streamlined transducer is not relevant. However, the transducer may be
added to an already existing blister that also holds other flush mounted transducers.
A Bolt with suitable diameter and length
B
Nut
C
Washer
D
Transducer cable
E
Blister bottom plate
F
Fill with suitable filling compound (putty) to
reduce flow noise
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.
The cable from each transducer
penetrates the hull using a stuffing
tube. Leave an adequate loop of
the cable over the transducer inside
the blister for easy mounting or removal of the transducer.
Once the transducer has been installed, fill the bolt holes with a filling compound (putty) to
ensure a smooth transducer surface.
Note
Any obstructions, cracks, dents or unevenness on the transducer face may cause flow noise.
Transducer installation principles