Transducer description
The Simrad MS70 transducer is a short cylindrical container with 800 transducer elements. The transducer elements are located at the "bottom" of the transducer. When the transducer is mounted, the elements are facing sideways. The transducer cables are provided as 25 individual cables in three bundles. Each cable is terminated in a large male connector.
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The Simrad MS70 transducer face is plane, and consists of a ceramic-polymer composite matrix. The matching transformer for each transducer element is located inside the transducer. This allows for a low impedance connection to the Transceiver Unit.
Note
The maximum length of the transducer cables is 30 meters, while the minimum length is 15 meters. The transducer cables can not be spliced. The required length of the cables to fit each specific installation must be determined before the transducer is ordered.
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.
Note
The transducer - with the cabling - is a delicate item. Great care must be shown during all handling. Even minor damages to the transducer cable may cause water to penetrate both the cable and the transducer body. A physical blow to the transducer face may easily damage one or more elements.
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A Transducer
B Sacrificial zinc anodes
C Clamping ring
D Mounting ring
The transducer must be mounted so that it has a clear view within its coverage sector. It is also important that the transducer is mounted so that the water around it is not aerated.
A mounting ring must be welded to the side plating. A clamping ring is then inserted sideways towards the mounting ring.
The transducer is secured with twelve -12- M12 bolts through the clamping ring, and fastened to the mounting ring. Both rings may be supplied with the MS70 delivery.
Note
An accurate measurement of the final position and angular orientation of the transducer is always required after installation.
The risk of galvanic corrosion must be taken into account in the design of the mounting structure. Periodic inspection of the mounting screws and use of sacrificial anodes is required.
Sacrificial zinc anodes
The transducer is provided with three sacrificial zinc anodes. These are mounted on its top surface (lid). The sacrificial zinc anodes must be replaced when 1/3 of their bodies have been spent.
If it is difficult to access the zinc anodes after the transducer has been installed, additional anodes must be mounted inside the blister. These additional anodes must be in electrical contact with the transducer, but not with the blister and/or the hull.
Transducer specifications
•  Diameter: 677 mm
•  Height: 313 mm
•  Minimum space required behind transducer: 500 mm
Transducer cable specifications
•  Quantity: 25
•  Length:
–  Maximum: 30 m
–  Minimum: 15 m
The transducer cables can not be spliced. The required length of the cables to fit each specific installation must be determined before the transducer is ordered.
•  Cable outer diameter:
–  Without protective hose: 16 mm (Minimum)
–  With protective hose: 22 mm (Minimum)
•  Weight:
–  Transducer: 250 kg (Without cables)
–  Transducer cables: 8,75 kg/m (Without protective hose)
–  Transducer cables: 12,5 kg/m (With protective hose)
–  Total weight: 382 kg (15 m)
•  Minimum bending radius:
–  Static: 95 mm
–  Dynamic: 243 mm
•  Tensile strength: 3000 N
•  MaterialPolyurethane (Outer sheet)
Rules for transducer handling
A transducer must always be handled as a delicate item. Wrongful actions may damage the transducer beyond repair. Observe these transducer handling rules:
•  Do not activate the transducer when it is out of the water.
•  Do not handle the transducer roughly, avoid impacts.
•  Do not expose the transducer to direct sunlight or excessive heat.
•  Do not use high pressure water, sand blasting, metal tools or strong solvents to clean the transducer face.
•  Do not damage the outer protective skin on the transducer face.
•  Do not lift the transducer by the cables.
•  Do not step on the transducer cables.
•  Do not damage the transducer cables, avoid sharp objects.