The Simrad SY50 fish-finding sonar can be provided with one of the following hull units. Which hull unit to choose depends on the size of your vessel and your operational requirements.
The hull unit is designed to lower the transducer down below the ship's hull when the SY50 system shall be used. When the sonar is turned off, the transducer is hoisted for protection.
(A) Cable gland
The Simrad SY50 sonar can be provided with one of the following hull units:
The hull unit is a mechanical construction. It is mounted on the top of the installation trunk. The installation trunk penetrates the ship’s hull and allows the transducer to be lowered into the sea. The hull unit is normally located in the forward part of the vessel. This location is recommended to avoid noise from the propellers and the engine.
In case of power failure, the transducer can be raised or lowered manually.
If you forget to hoist the transducer before the sonar is turned off, the transducer is hoisted automatically before the power is disconnected. The transducer is also hoisted automatically if a serious malfunction occurs in the communication between the bridge and the hull unit.
Caution: If the transducer hits larger objects or the bottom, the transducer shaft may be bent, or - in the worst case - it can be broken off. A broken transducer shaft will cause water leakage through the top of the shaft. If you suspect that the transducer shaft is seriously damaged with holes, do not retract the transducer to its upper position. To prevent serious damage to the vessel or the vessel's stability, you must have a water pump and a warning system in the sonar room.