RD5100H
2
O+ Operation Manual
© 2018 Radiodetection Ltd
21
To select Peak mode:
1 Press the
key to select either Power or Radio
mode. The Peak mode icon
is displayed on the
LCD.
NOTE: In Power mode the depth value will display
automatically, although this value should not be
considered accurate until the locator is directly over the
target line.
5.3 Compass
The LCD compass provides a visual indication of the
direction of the target cable, pipe or sonde. The compass
is available for all frequencies apart from Power and
Radio. Compass can be enabled or disabled in the
configuration menu.
5.4 Trace
Line tracing can be accelerated by switching the locator
to Guidance mode with the TPI enabled.
Move the locator left and right while walking along the
path of the line to place the TPI needle directly over the
line. As you move the locator over the line, the left and
right arrows (and an accompanying tone) will indicate if
the target line is to the left or right of the locator.
Move the locator to find the Null position. If the position of
the Peak and the Null pinpoints correspond, it can be
assumed that the pinpoint is accurate. The pinpoint is not
precise if the marks do not correspond, but both marks
will show an error to the same side. True line position will
be close to the Peak position.
The line lies half the distance to the other side of the
Peak position as the distance between the Peak and the
Null positions.
5.5 Sweep and search
There are a number of techniques available for locating
unknown lines in an area. Using these techniques is
particularly important before conducting any excavation
work to help ensure that buried lines are not damaged.
Passive sweep
A passive sweep is used to locate Power or Radio
signals that may radiate from buried conductors.
To perform a passive sweep:
1 Press the
key to select the passive frequency you
wish to locate. You can select from the following
passive frequencies:
Power
Radio.
2 Adjust the sensitivity to maximum; reduce the
sensitivity to keep the bar graph on scale when there
is a response.
3 Traverse the area in a grid search, at a steady walk,
and hold the locator comfortably with the locator in
line with the direction of movement and at right
angles to any lines that may be crossed.
Figure 5.2 - Passive sweep
Stop when the locator response rises to indicate the
presence of a line. Pinpoint the line and mark its position.
Trace the line out of the area being searched. Resume
grid search in the area.
In some areas there may be a confusing amount of
50Hz / 60Hz power signals. Lift the locator 50mm (
2”)
from the ground and continue the sweep.
Switch the locator to Radio Mode. Increase sensitivity to
maximum and repeat the above grid search procedure
over the area. Pinpoint, mark, and trace out any lines that
are located.
In most, but not all areas, Radio mode will locate lines
that do not radiate power signals and a grid search
should be made in both Power and Radio modes.
Inductive search
An inductive search procedure is a more certain
technique for locating unknown lines. This type of search
requires a transmitter and locator and two people. This
type of search is referred to as a ‘two person sweep’.
Before starting the sweep, define the area of search and
the probable direction of lines crossing the area. Ensure
the transmitter is switched on in induction mode.
