Sonar Head Assembly Orientation; Sonar Reference Point; Wet-End Mounting - Teledyne SeaBat T Series Operator's Manual

INSTALLATION INSTRUCTIONS
B.5.8 Sonar Head Assembly Orientation
The sonar head assembly should be mounted with the faces of the arrays oriented vertically
downwards. Ideally, the receiver is mounted across track, while the projector is mounted along track
and aft of the receiver. If necessary, the projector may be oriented forward or the head rotated away
from vertical with allowances made in the processor setup and data acquisition software.
An alternate mounting makes the projector more susceptible to impact damage and collection
of trailing debris.
 The faces of the projector and receiver must be aligned in the vertical ("Z") plane
within +/-2.0mm.
 The alignment in the along-ship ("Y") plane and across-ship ("X") plane should be
within +/-250.0mm.
The actual sonar head assembly installation must be reflected in the user interface settings (see
appendix B.5.11 below or refer to Appendix E Reference Documentation).
B.5.9 Sonar Reference Point
The following axis convention is applied for the sonar reference point convention:
 X = across ship, points to starboard:
 Y = along ship, points forward:
 Z = vertical, points up:
There is a single sonar reference point to which all output is related. This point is normally defined
in the data acquisition software as a node or offset point. The point is in the center of the receiver
face in both X and Z directions and in the center of the projector in the Y direction.
It is important to note that the sonar reference point may not be a physical point on the sonar system.
B.5.10 Wet-End Mounting
 Remove the blue transport bumpers on the SPP prior to installation of the unit.
 The SSP pressure housing should be mounted horizontally with a free flow of water
around the unit.
 Take care that the sonar head assembly and SSP are electrically isolated from the
structure to avoid corrosion problems.
 The head should be immersed in water to a depth of at least 0.8m. This ensures that
noise from surface waves does not degrade performance.
Fairings can be used to improve hydrodynamic performance (see section 7.9 Hydrodynamic
Drag and appendix E.2 SeaBat T-Series Subsea Design Documents).
The sonar head is not designed to be hydrodynamic at speeds in excess of two knots. Vibration
and oscillation will become evident, if the projector and receiver are not rigidly mounted.
SeaBat T-Series Subsea Operator's Manual
Version 7
CAUTION
+ Starboard
- Port
+ Forward
- Aft
+ Up
- Down
NOTE
Page 108 January 31, 2019