Kongsberg EM 712, Installation Manual

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401027/B
Transducer description
The EM 712 uses separate transducer arrays for transmitting and receiving sound
pulses. Both transducer arrays can have one or more modules which are assembled in
mounting frames.
The EM 712 can use two sizes of transmit (TX) and
receive (RX) modules.
The number of cables for each transducer module
varies.
•
1 degree transmit transducer
: TX1, 10 cables
•
2 degrees transmit transducer
: TX2, 5 cables
•
1 degree receive transducer
: RX1, 4 cables
•
2 degrees receive transducer
: RX2, 2 cables
The cables are moulded to the transducers. They connect to the Transmitter Unit and
Receiver Unit with connectors.
The standard length of the transducer cables are 15 metres. There is an option for cable
length of 25 metres.
The EM 712 transducer modules are available in an ice reinforced version. For more
information, contact Kongsberg Maritime.
The number of individual TX and RX modules in the two arrays depends on the chosen
configuration. The standard types identified by "transmission x reception" beam width
are:
•
0.5 x 0.5 degrees system
: 2 TX1 modules and 2 RX 1modules
•
0.5 x 1 degree system
: 2 TX1 modules and 1 RX1 module
•
1 x 1 degree system
: 1 TX1 module and 1 RX1 module
•
1 x 2 degrees system
: 1 TX1 module and 1 RX2 module
•
2 x 2 degrees system
: 1 TX2 module and 1 RX2 module
Note
The red protective coating is an 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.
The two transducer arrays are normally mounted as “T” or “L” configurations under the
vessel’s hull (Mills Cross configuration). The transmit transducer array should be aligned
parallel to the vessel’s keel. The receiver transducer array should be aligned 90 degrees
on the keel. Both transducer arrays should be horizontal on a plane on the keel.
Kongsberg EM 712 Installation manual