The purpose of this publication is to provide the descriptions, procedures and detailed parameter explanations required to allow for safe and efficient use of the ST90 system. The publication also provides you with a thorough understanding of the parameters and adjustments provided by the ST90 system.
In order to secure a long and trouble-free operation of the ST90 system, certain specific preventive maintenance tasks must be done. The tasks are organized in a preventive maintenance schedule.
All tasks can be done by the crew.
The list of approved anti-fouling paints can be found on our website. Always refer to the manufacturer's documentation and data sheets for a complete procedure and for relevant safety information.
It is important that the sonar room is kept clean and dry. The system units must not be exposed to excessive temperatures, moisture or humidity. Such conditions can cause corrosive attacks and subsequent failures to the electronic circuitry. Visit the sonar room at regular intervals to check for dust, high temperature and humidity.
To ensure long and trouble-free operation of the display, it must be inspected and cleaned at regular intervals.
To ensure long and trouble-free operation of the Processor Unit it must be inspected and cleaned at regular intervals.
To ensure long and trouble-free operation of the Operating Panel it must be inspected and cleaned at regular intervals.
To ensure long and trouble-free operation, the Transceiver Unit must be inspected and cleaned at regular intervals.
Regular inspections of the hull unit is required to make sure that it operates properly.
All surfaces that are in contact with seawater are exposed to marine growth (biological fouling). This includes the hull plating, the blister and the installation trunk. Marine growth inside the installation trunk can damage the transducer. Excessive marine growth on the hull plating close to the transducer can cause noise. Every time your vessel is in dry dock, you must remove the marine growth.
Marine growth (biological fouling) on the transducer face reduces the performance. For this reason, it is important to keep the transducer face clean. Every time your vessel is in dry dock, you must remove the marine growth. At the same time, you must inspect the transducer closely for physical damage.
Marine growth (biological fouling) on the transducer face reduces the performance. We suggest that you paint the transducer face immediately after installation, and then again as often as required to maintain the protection. It is particularly important to do this if you operate in waters with a lot of marine growth.
Sacrificial anodes are used to protect the hull unit and the installation trunk from corrosion. They are mounted under the mounting flange at the top of the installation trunk. Additional sacrificial anodes may have been mounted by the shipyard during the installation of the ST90 system.
The hoisting spindle is positioned between the gantry and the transducer shaft. The top of the transducer shaft is mounted to the hoisting spindle with a lifting clamp. When the hoisting spindle turns in either direction the lifting clamp moves up and down, and so does the transducer shaft with the transducer.
The transducer shaft sleeve is a vital part of the hull unit. It supports the transducer shaft, and allows the shaft to move down and up to lower and hoist the transducer. The transducer shaft sleeve is filled with grease. The grease ensures that the vertical movement of the transducer shaft is not limited by friction. The grease also ensures that the entire construction is waterproof.
The technical specifications summarize the main functional and operational characteristics of the ST90 system. They also provide information related to power requirements, physical properties and environmental conditions.
The ST90 system can send and receive information to and from several different peripherals. All transmissions take place as datagrams with data sentences. Each datagram has a defined format and length.
