Teledyne 440, System Manual, Page: 44 / 256

3 – Physical Installation
3-12 © Teledyne TSS DPN 402196 Issue 4.1
Figure 3-7: Coil fixing and use of spacers for coil arrangement
NOTE
Where there is the possibility of damage to the search-coils from contact with a
rocky or abrasive seabed, you may mount the coils on top of the outrigger bars.
3. Use stainless steel bolts or U-bolts to secure the outriggers to suitable parts of the ROV frame.
Ensure that the outriggers are parallel with the ROV skids. This precaution gives a small rela-
tive angle of pitch between the ROV and the search-coils. Pitch angles greater than ±15°
between the coils and the target will affect measurement accuracy.
4. If necessary, you may drill new 16.5mm diameter holes in the mounting strips to help assemble
the frame. When you assemble the frame, make certain you do not place excessive mechani-
cal stress on any of the fixing studs.
CAUTION
Take care to protect the coils when you drill holes in the frame components. Do
not drill holes into any part of the coils. Do not machine the coils in any way.
5. Use four lengths of nylon stud and attach the coil array to the two outrigger bars as shown in
Figure 3-6 (b). Support the coils while you do this.
6. Use nylon stud inserted through the lateral holes to attach the ends of the tie-bars to the outrig-
gers – see
Figure 3-6 (c). If no suitable 16.5mm diameter holes exist in the outriggers, drill
them.
Use stainless-steel bolts or U-bolts to secure the free ends of the tie-bars to the ROV frame as
shown in
Figure 3-6 (d). You may have to shorten the tie-bars so that they do not snag the ROV
umbilical.
Nylon stud
Cable tie
Cable tie
Nylon
washers
Nylon M16 nut
Search-coil
Coil frame
member
Coils
Spacers (8 off)
Rigid Support frame from ROV