System diagram
The system diagram identifies the main components of a basic SN90 system. Only the main connections between the units are shown. Detailed interface capabilities and power cables are not shown.
Image
A Display (The second display is optional.)
B Processor Unit
C Operating Panel
D Transceiver Unit
E Hull Unit (option)
F Hoisting motor
G Motor Control Unit
H Transducer
I Hydrophones (option)
J Cables to sensor receiver (option)
In this publication, the computer can also be referred to as the Processor Unit, and vice versa.
Unless otherwise specified in a contract, the display is not included in the standard delivery. This is a commercial item that can be purchased locally.
A hull unit may be provided as an option. It allows you to lower and hoist the transducer.
A special version of the transducer housing is available for use on a hull unit. Two trawl hydrophones are added for use with a catch monitoring system. Both hydrophones point aft.
The hull unit must be mounted on a suitable installation trunk. When this option is selected, the transducer is delivered readily mounted at the lower end of the transducer shaft.
Note
The transducer installation must be designed to fit the shape and characteristics of the vessel’s hull. The installation method and the cable penetration must be approved by the relevant maritime authority.