Installing the transducer into the mounting ring
When all the preparations have been made, the transducer must be installed into the mounting ring.
Prerequisites
In order to do this task, the following prerequisites must be met.
•  The mounting ring has been installed.
•  The steel conduit is mounted with all installation work finalized.
•  The transducer cables are installed. A service loop is provided immediately over the transducer.
•  All relevant drawings have been approved by the classification society.
•  All relevant personnel (skilled shipyard workers) and their tools must be available.
You must be equipped with a standard set of tools. This tool set must comprise the normal tools for mechanical tasks, such as different screwdriver types, pliers, adjustable spanners and wrenches. Each tool must be provided in various sizes. We recommend that all tools are demagnetized to protect your equipment.
The following specific tools and items are required for this task:
•  Torque wrench
•  Loctite 270 (permanent high-strength threadlocker)
•  Lifting device
•  Ropes and tackles
Context
This circular transducer is designed to be mounted using clamping and mounting rings. 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.
Observe the guidance notch on the mounting ring. This notch must point UP! Observe the arrow on the clamping ring indicating "up". The clamping ring is also fitted with a guide bolt to ensure correct fit.
Note
Observe the physical size and weight of the transducer. Unless a suitable lifting device available, make sure that enough manpower is available to lift, hold and fasten the transducer.
A transducer must always be handled as a delicate item. Wrongful actions may damage the transducer beyond repair.
Procedure
1 Lift the transducer up into its location.
2 Align the holes on the clamping ring to the holes in the mounting ring.
Note
Observe the direction of the transducer. The "forward" marking must point up!
3 Mount the transducer using stainless steel bolts.
Use bolts M12x55, stainless steel, A4 Class 80. Bolts and washers are included with the clamping ring.
Apply Loctite 270 to secure the bolts. Use maximum torque: 76 Nm
4 When the transducer has been fastened, inspect the plating around the transducer face.
a Fill the space around the mounting bolts with a a suitable filling compound (putty).
b Make sure that the surface of the transducer face, as well as the plating and putty around the transducer is as even and smooth as possible.
c Verify that there are no spatter, sharp edges or protruding objects. If necessary, grind and polish all surfaces.
Objects protruding from the hull will generate turbulence and flow noise. This will reduce the MS70 performance. Protruding objects may be zinc anodes, transducers or even the vessel's keel. Holes and pipe outlets are also important noise sources, as well as rough surfaces caused by bad welding. Even traces of sealing compound, sharp edges, bolts or empty bolt holes will create noise.
5 If required, allow the relevant maritime authority and/or classification society to inspect and approve the transducer installation.