Kongsberg Simrad CS90, Reference Manual

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26
442700/A
Hull Unit Lowering
depth (m) Transducer
cables (m) Maximum
speed (knots)
4.6 CS90 1.0
10
20
4.6 CS94 2.1
7
19
On some vessels, additional transducer protection is required. One example is vessels
working in arctic conditions. It is important for them to prevent ice from damaging the
transducer. A gate valve is then added to the hull unit installation. By means of a mechanical
construction it shuts off the bottom of the installation trunk when the CS90 system is not
used.
For more information, refer to the end-user documentation provided by the manufacturer.
Related topics
Simrad CS90, page 17
System units, page 23
Lowering and hoisting the transducer from the sonar room, page 187
Transducer
The cylindrical transducer allows the sonar beam to provide a full 360 degrees coverage of
the water volume.
The transducer converts the electric energy generated by the transmitter circuitry to physical
vibrations. These vibrations alter the water pressure, and create an acoustic pulse that is
sent into the water. The acoustic signal is transmitted as a beam. The duration of the
acoustic pulse, as well as its frequency and shape, are controlled by the system software.
The direction and opening angle of the beam is controlled by the transmitter circuitry and
the physical properties of the transducer. After the transmission, the transducer works as
a "microphone". It converts the water pressure created by the acoustic echoes to electric
energy. These weak echo signals are sent to the amplifiers in the receiver circuitry.
Note
The transducer is covered with a thick red or black protective coating made of a special
plastic type. The protective coating is a vital part of the transducer. It is very important
that neither this coating nor the internal parts of the transducer are damaged during the
handling, installation or cleaning. Any holes and/or scratches in the transducer surface will
allow water to penetrate the transducer. If a leak occurs, the transducer must be replaced.
Simrad CS90 Reference Manual