Teledyne 440, System Manual, Page: 46 / 256

3 – Physical Installation
3-14 © Teledyne TSS DPN 402196 Issue 4.1
you use a separate profiling system to measure the accurate seabed level. See
section 7.2.1.4 "Altimeter Positioning" on page 7-4 for further information.
3.2 Installation Check-list
❐
Ensure the centre coil is mounted further away from the seabed, i.e. above the port and star-
board coils.
❐
Ensure the array is central on the ROV and that it aligns with the fore-aft direction of travel.
❐
Mount the coil array so that its lowest point is more than 0.1m above the lowest point on the
ROV. Use a higher mounting location if coil saturation is likely during survey operations on a
large target.
❐
Mount the coils so they are parallel with the horizontal axis of the ROV.
❐
Make certain there is sufficient separation between the coils and the ROV body. The back-
ground signals from the ROV should be less than 1000µV for standard coil values and 7500µV
for early coil values to allow successful operation. Usually, this requires a separation distance
of 0.75 to 1.2 metres between the coil array and the ROV body.
❐
If you intend to install the 440 System on the same ROV as a Teledyne TSS 350 or 350 Pow-
ertrack System, follow the instructions and recommendations concerning coil installation in
Appendix B.
❐
Do not install the coil array closer than 1m to any conductive materials. Do not use any metal
fixings and fastenings within the coil frame.
❐
Do not allow any free movement in the coil array or the cables. Poor mounting will reduce the
quality of the survey information.
❐
Always use the nylon mounting blocks when you install the SEP and the PSU.
❐
When you select a location to install the altimeter, consider its minimum range measurement
specification.
❐
Avoid installing your altimeter where there is a significant horizontal offset distance between it
and the coil array.
❐
Record all installation-specific configuration details in the Survey Log.