Vivax Metrotech vLocDM, Руководство пользователя

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Page 28 of 47
TIP
The locate icon (1) will still be active whilst using the A-frame and should be used to ensure the
A-frame is used directly above the pipe. However, adjustments to sensitivity/mode/frequency
can only be made when in the Locate Screen. It is possible to jump to the Locate Screen by
pressing the “Return” pushbutton. Make the desired adjustments in the Locate Screen and
then jump back to the A-frame Screen by again pressing the “Return” pushbutton.
To delete the log, press and hold the “-” pushbutton. A message will be displayed as shown in the screen below.
Press the “+” pushbutton to confirm to delete the log or “-” pushbutton to return to the graph.
At the null point, the arrows will reverse; this is the location of the defect. Repeating the procedure across the
pipeline will help pinpoint the defect in the other plane. See diagram below.
Continue walking in the direction of the arrow placing the A-frame in the ground at approximately one meter
intervals saving the results as you go. The graph will rise as the defect is approached and then fall at the defect.
Continuing past the defect will create a similar but reversed effect. A typical defect “signature” is shown below.
NOTE
If GPS is not activated, the horizontal intervals are assumed to be equal. If a GPS option is
activated, the intervals are still shown as equal on the graph but the internal data log stores
the GPS coordinates with the GPS data. This is because the accuracy of the GPS function
tends to be less accurate than is what is required for A-frame fault finding.
Log 244
28dBµV
To Delete
Press
6 Using the vLocDM Receiver