Installing the mounting ring
The mounting ring has been designed to offer a reliable and maintenance friendly installation method for the MS70 transducer. Once the transducer is installed in the mounting ring, it can also easily be removed for maintenance purposes.
Prerequisites
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. Depending on the tasks at hand, additional tools may be required. Observe the relevant rules and regulations related to welding. The quality of the welding is critical to the safety of the vessel. Welding must only be done by a certified welder.
In order to do this task, the following prerequisites must be met.
•  All relevant vessel and transducer drawings must be available.
•  All relevant work instructions, procedures and standards must be available.
•  The physical location of the transducer has been determined.
•  The drop keel has been mounted, and the design has been prepared to accept the mounting ring.
•  All relevant personnel (skilled shipyard workers) and their tools must be available.
Context
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.
Image
A Mounting ring
B Clamping ring
C This is the guidance notch on the mounting ring. This notch must point UP!
D This is the guidance bolt on the mounting ring (M6).
E This is the guidance hole on the clamping ring (M6). The guides shall ensure that the clamping ring fits correctly on the mounting ring.
F Holes for two of the mounting bolts.
G Self-locking threads to accept the mounting bolts.
Note
The installation of the mounting ring 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.
Recommended inclination angle for the MS70 transducer face is: 2° (Approximately)
Note
Ensure that you do not mount the transducer with a negative inclination angle. This may cause turbulence on the transducer face, and reduced MS70 performance.
Procedure
1 Position the mounting ring in the hole prepared for it.
Note
Observe the guidance notch on the mounting ring. This notch must point UP!
2 Weld the mounting ring in place.
3 After the welding has been completed, inspect the mounting ring closely.
Note
Make sure that the surface of the resulting installation is as smooth and streamlined as possible. If necessary, grind and polish all surfaces.
Mounting screws or bolts must not be extruding from the hull or from the installation hardware, blister or keel box Obstructions on these surfaces will create problems with turbulent flow, and may cause noise.