Leaders in Pipelin
e Survey Systems
C
C
C
-
-
-
S
S
S
C
C
C
A
A
A
N
N
N
2
2
2
0
0
0
1
1
1
0
0
0
SYSTEM MANUAL Version 6.03i
39
Within each graph the following options are available:
◄
# - Move to previous survey point
#
►
- Move to next survey point
To return to the START-UP screen press the
SEARCH
icon (
). The Detector is now
ready to move to the next survey position and repeat the above process.
6.4.8. Low Signal
The above process of taking and recording samples can be repeated until the signal from
the Signal Generator is too weak to pick up. This is indicated on the search screen
(section 5.3) by the
LOW
indicator flashing between
and
.
When this occurs the Signal Generator needs to be moved to continue the survey.
6.4.9. Move Generator
To continue a survey the Signal Generator can be moved and connected to the pipeline as
before. When moving the Signal Generator two important points should be remembered:
1) Ensure there is some overlap with the previous survey so that no gaps appear in
the data. Remember that the first 30-50ft from the injection point cannot be
surveyed.
2) When the Generator is moved, or the output current changed, a new survey must
be started.
6.5. Survey Numbering & Memory Storage
The first survey stored into an empty Detector memory will be allocated the ident S#00 and
each new survey will be automatically incremented by 1. Similarly, starting with survey
point #00, each survey point stored is incremented by 1. For example:
Survey Number
Survey Points
Number of points stored
S#00
#00 - #05
6
S#01
#06 - #13
8
S#02
#14 – #20
7
The total number of points or surveys that C-SCAN can hold in its memory is 500 points
spread over 100 surveys (whichever number is reached first), so although it is unlikely that
a surveyor will run out of memory, it is advisable to download the data and clear the
memory after each survey, or survey series.
