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Doc: Transducer Installation
Version: 2.6 May 2021
Doc: Transducer Installation
Version: 2.6 May 2021
TRANSDUCER INSTALLATION MANUAL
TRANSDUCER INSTALLATION MANUAL
4 HULL MOUNTING CONSIDERATIONS
The transducer is mounted on the hull below the water line, normally using a permanent
sea chest. The transducer must be mounted so that it is aligned with the fore-aft axis of
the vessel. It must also be mounted so that the flat underside of the transducer is as close
to horizontal as possible.
If the vessel has a keel, the transducer can be mounted somewhere along the length of
it. If it is mounted on the hull, it should be far enough away from the keel so that the keel
will not be detected within the 120° WASSP beam pattern.
shows
a sea chest type through-hull mounting designed specifically for a fast moving, alloy hull
crayfish boat.
The performance of the system is directly related to the mounting location of the
transducer, especially for high-speed cruising. The installation should be planned in
advance, keeping in mind the fixed cable length of your transducer (5m / 10m / 20m)
and the following factors:
»
Air bubbles and turbulence caused by movement of the vessel seriously degrade the
sounding capability of the transducer. The transducer should be located in a position
with the smoothest water flow.
»
The transducer should not be mounted close to propellers because noise from
propellers can adversely affect the performance of the transducer.
»
Mount the transducer inboard of lifting strakes as these create acoustic noise.
»
The transducer must always remain submerged, even when the boat is rolling,
pitching or planing at high speed.
»
A practical choice would be somewhere between a 1/3 and a 1/2 of the boat’s
length from the bow. For planing hulls, a practical location is generally towards the
rear of the vessel, to ensure that the transducer is always submerged, regardless of
the planing angle.
»
Do not mount another transducer near the WASSP transducer as it will cause
interference
Planing hulls
On planing hulls the transducer needs to be mounted in or on the aft part of the hull,
which stays in the water when the vessel is on the plane.
The transducer can be mounted either in a streamlined housing or blister on the hull or
inside the hull in a specially prepared cofferdam, with the transducer face flush with the
hull and faired to the hull shape.
It is important that the part of the hull in front of the transducer is smooth and has no hull
penetrations or attachments of any kind.
Displacement hulls
A practical choice is somewhere in the area between a 1/3 and a 1/2 of the vessel’s length,
from the bow. The transducer should be mounted in a housing or blister attached to the
hull.
The disturbed aerated water tends to be in a layer against the hull, it’s thickness varies by
vessel’s speed and sea conditions. Therefore the deeper the housing is, i.e. the further
the transducer is away from the hull, the better the equipment will perform. Also on
V-shaped hulls the housing should be mounted against or close to the keel, again to get
deeper and away from aeration and turbulence. The 120 WASSP beam pattern must be
kept in mind when mounting the transducer. No part of the keel or hull should protrude
into this pattern.
Larger displacement hulls with bow thruster
The best location on these vessels is in or against the keel, forward of a line just aft of the
thruster cavity. Locations further aft are becoming heavily affected by aeration when the
vessel pitches and air exhausts out of the thruster tunnel on the downward movement
of the bow. This air creates havoc with the performance of any transducers further aft on
the hull.
"Figure 7. Transducer mounting locations for larger displacement hulls"
suggest
mounting locations for these types of vessels.
In these installations, the strength of the mounting becomes very important, as the
transducer can be out of the water when the vessel pitches. Re-entry into the water
exerts large forces on the transducer face and the mounting structure.
See "5.1. 160kHz Transducer Mounting" on page 14 and "5.2. 80kHz Transducer
Mounting Assembly" on page 16
for mounting diagrams and instructions. These steps
must be carried out accurately and completely.
FWD
View from above
In housing
In box keel
Mounting area for transducer
on large vessels with thruster
View from the bow
Figure 7. Transducer mounting locations for larger displacement hulls
CAUTION:
Please see "5 Mounting Assembly" on page 14
pay attention to the torque tension of the mounting nuts and the
requirement to fill any gaps that exist between the transducer body and the
retaining with epoxy.
A non-solvent based anti-fouling must be applied to the transducer face
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