Leaders in Pipeline Survey Systems
2 - 14
OPERATING MANUAL
PART 1 – OPERATION
AVW 150203 – 2010O&MPt1-Sec2.DOC
2.3.3 Search
In this example,
from the Search
screen display –
see Fig 13 right –
it can be seen that
the pipeline is
located behind
and to the right of
the current
position of the
Detector Unit (DU)
– see Fig, 12 left.
As the DU is turned so the indicator in the centre of the screen will rotate.
NOTE: the circle equals a 2 metres (approx. 6ft 6”) distance. If the pipeline is greater
than 2 metres away then the line will stay in the boundary. The number above the circle
indicates the horizontal distance in metres (1.2m in this example). If the pipeline is out
of range no figure will be displayed.
It is not possible to give accurate figures when the DU is not directly over the pipeline, so all
numbers shown are approximate (indicated by the ~ symbol).
In this example depth to the centre is 1.3m To change this to depth of cover, press the
key adjacent to the cover symbol (bottom LH corner box). Note that if the pipeline
diameter has not been entered, this symbol will not be shown.
The GPS position indication is showing a ‘BAD’ signal – i.e: no satellites in view.
NOTE: if the GPS has just been powered up, this ‘BAD’ signal will be displayed.
Acquisition times vary from 10 secs to 45 mins. If the DU has been moved a large
distance – or this is the first time that the DU has been used – the acquisition time will
be likely to be nearer to 45 mins. It is important that the DU (with GPS ON) is switched
on for at least 15 minutes after a position is displayed; this will ensure a fast turn-on
next time. After acquisition, the display will show ‘GOOD’ plus the number of satellites
available.
Fig. 12 – diagram showing
the position of the DU
relative to the pipeline as
indicated on the
Search screen
Fig. 13 – the Search screen
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