Installation principles
Basic installation principles apply for the MS70 units. A drop keel is a superior platform for the MS70 transducer. The other main units are installed in a "sonar room". The Processor Unit with its display are installed "topside", for example on the bridge, in a laboratory or in an operator room.
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A Transceiver Unit
The MS70 Transceiver Unit is housed in a 19 inch instrument rack. Easy access to the front and rear part of the rack is essential, as this allows for easy replacement of parts. In order to reduce the loss in the transducer cables, the Transceiver Unit is physically located as close as possible to the transducer.
The Transceiver Unit is designed to be installed next to a bulkhead. The cabinet is fitted with shock absorbers at the bottom, and on the side.
The top shock absorbers are by default located on the left side of the cabinet. If required, they may be moved to the other side. If you do this, you may also wish to move the hinges on the cabinet doors. These are also by default located on the left side, but are easily moved to the right side.
B Power Supply Unit
C Uninterruptible Power Supply (UPS)
It is important to ensure continuous operation of the MS70 independent of varying quality of the vessel's mains supply.
The Uninterruptible Power Supply (UPS) must have the capacity to independently maintain power to the MS70 for a minimum of 10 minutes. This ensures that the MS70 can be turned off in a controlled manner in the event of a power failure.
The uninterruptible power supply is not a part of the MS70 delivery. This is a commercial item that can be purchased locally.
D During normal operation, the Transceiver Unit produces a lot of heat. The sonar room must be fitted with a proper ventilation system. In order to ensure proper operating temperature, the Transceiver Unit must be physically connected to the ventilation system.
The top of the Transceiver Unit cabinet is fitted with a dedicated adapter. A suitable ventilation duct must be connected to this adapter to allow the ventilation system to suck heated air out of the cabinet. The ventilation adapter will also prevent dust and other particles from falling into the Transceiver Unit cabinet.
Note
The connection to the ventilation system must be done in such a way that the heated air from the Transceiver Unit is sucked up and sent out by sonar room.
E The power cables from the three Power Supply Unit to the Transceiver Unit must be run in steel conduits. These conduits serve the following purposes:
•  Noise and interference protection
•  Physical protection
The minimum internal diameter of the steel conduits is 5 cm. The maximum length of unprotected cable is 1 meter in each end of the conduit. For this reason, separate conduits for each Power Supply Unit is required.
F Steel conduit
Unless the sonar room is located next to the drop keel, we recommend that the transducer cables are run in a steel conduit for the entire distance. The transducer cables may be run in a steel conduit inside the sonar room.
Note
The transducer cables must never be installed close to high voltage power cables. Keep safe distance from electric motors, generators or other devices or systems that may cause noise.
G All cables enter the Transceiver Unit through the bottom of the cabinet. Use U shaped steel profiles to add extra height. This allows room under the Transceiver Unit for transducer and interconnection cables. If necessary, you can use the space below the Transceiver Unit to install a cable tray for the transducer cables.
H Watertight seal
I If the transducer is installed in a drop keel, the transducer cables must be protected. Each cable must be fitted with a protective hose. The protective hose starts inside the transducer. Protection must be used along the entire length of the cables, and all the way up to where the cables penetrate the hull.
The protective is hose is fitted to the transducer cables during the production. For this reason, the length of the hose must be specified when you order the transducer.
J The cables must be permitted to move freely when the drop keel is lowered and hoisted. It is important to avoid sharp edges or protruding elements, as these may cause damage to the cables. Observe the limitations for the cable minimum bending radius. Any damage to a cable may cause water ingression. Water follows the cable cores into the transducer, and causes damage that can not be repaired. Wherever the cables are unprotected outside the drop keel, use a flexible conduit for protection.
K Steel conduit
L At the bottom of the drop keel, the MS70 transducers is installed vertically with its face flushed with the keel side plating. The mounting ring is welded to the hole prepared for the transducer. Bolts through the clamping ring into the mounting ring will secure the transducer in place.
The installation of the transducer must be done with the correct inclination angle.
Ideally, the transducer face should be mounted vertically in parallel with the vessel’s fore-and-aft axis. However, it is also very important that the water flow over the transducer face is laminar. In order to ensure laminar flow, the transducer face must be tilted slightly forward in relation to the water flow. This allows the flowing water to meet the face directly, and reduces laminar noise.
M Make sure that the drop keel is large enough to house the MS70 transducer as well as other hydroacoustic devices.
A: Adjust this distance to make room for other transducers and hydroacoustic devices.
B: Minimum 600 mm is required for the MS70 transducer.
C: Make this distance as small as possible to install the transducer as deep as possible.