
DPN 402197 © TSS (International) Ltd Page 9 of 14
3.2.2.2 Mounting the Coils
Figure 3–4: Coil mounting components
WARNING
The coil triads are heavy. To avoid personal injury, always use help when you lift or
move the assembled coil array.
CAUTION
If you mount the 350 System on the same ROV as a
TSS 440 Pipe and Cable Survey System.
With drive current applied to the search-coils of the 440 System, large induced volt-
ages can appear across the sensing coils of the 350 System.
Later versions of the 350 sensing coils included diode protection to avoid damage to
the coil preamplifiers. Refer to Appendix B.2 for details.
The accuracy of measurements made by the 350 System might degrade if any of the
following affect the characteristics of the electromagnetic field radiated from the target:
❐The proximity of any material that is more conductive than the seawater. This includes a
metal or carbon-fibre ROV frame.
❐The proximity of any large magnet such as that of an actuator.
❐The presence of any conductive material between the coil triads that electrically shortens
the coil separation distance.
It is not possible to predict how the measurements will degrade when any of these
effects is present. To help avoid these effects, mount the coil triads at least 0.5 metres
from the ROV body.
The sensing coil triads are heavy. Ensure the mounting arrangements provide a rigid
and sturdy support to prevent the array moving or vibrating independently of the ROV.
Mount the coils on the front of the ROV at a height that protects them from collision
damage without degrading their vertical detection range. Typically, they will be
2160mm
2130mm
1290mm
240mm
390mm 390mm
240mm
870mm 870mm
900mm 900mm
2130mm
Tie Bar
Mounting Strip
Outrigger
2160mm
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