Kongsberg EM 710, Installation Manual

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Kongsberg EM 710
4 TRANSDUCER ARRAYS
This chapter describes the installation of the EM 710 Transmit
(TX) and Receive (RX) Transducer Arrays.
Drawings showing the installation principles and the physical
dimensions are included in the text. Other drawings are included
in the Drawing File.
Topics
• Installation principles on page 26
• Installation steps on page 27
• Locating the transducer array on page 31
• Installing the steel conduits on page 36
• Installing the mounting frames on page 38
• Installing the transducer modules on page 39
4.1 Installation principles
4.1.1 Basic description
The EM 710 uses separate transducer arrays for transmitting and
receiving sound pulses.
The transducers may be fixed to the hull with bolts from the front,
either directly on or recessed into the hull, or within sea chests.
The two transducer arrays are normally mounted as “T” or
“L”-configurations, or a similar variant under the vessel’s hull
(Mills Cross configuration).
The transmit transducer array should be approximately aligned
parallel to the vessel’s keel. The receiver transducer array should
be approximately aligned 90º on the keel. Both transducers
should be horizontal, approximately on a plane on the keel.
There is no need for the arrays to have the exact same heading,
roll and pitch.
The number of individual Tx and Rx modules in the two arrays
depends on the chosen EM 710 configuration.
System configuration TX modules RX modules
0.5 x 1 degree 2 x TX1 1 x RX1
1 x 1 degree 1 x TX1 1 x RX1
1 x 2 degree 1 x TX1 1 x RX2
2 x 2 degree 1 x TX2 1 x RX2
The cables connecting the transducers to the Transceiver
Unit have a standard length of 15 m, and are terminated with
connectors which plug directly into the cabinet.
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