© 2014 Radiodetection Ltd 19
Section 5 - Locating RF Markers
The RD7000+ locator enables users to locate most common RF utility markers. These are also referred to as
Electronic Marker System (EMS) and Omni Markers™.
RF markers are used to identify buried utilities and are
generally located, at regular intervals, directly on top of
the utility they are marking.
The markers are passive devices which resonate at a
specific frequency when energized by the marker
locator. Each utility is identified by a specific frequency
and color.
5.1 Marker Mode
Folding down the special marker loop antenna, on the
front of the RD7000+ locator, activates the Marker
mode.
In Marker mode, the locator can be used to locate a
specific marker or to locate a buried conductor and a
marker simultaneously.
5.1.1 Entering Marker mode
To enter marker mode fold down the marker antenna
loop. The locator will enter the Marker mode and display
the marker icon and identify the marker selected.
NOTE: The locator defaults to the last marker used
5.1.2 Changing RF marker type
1 Press the key to select the marker you wish to
locate.
The abbreviations for each type of marker are
indicated in the table below:
*Use of the red Electrical Power (PWR) marker locate
mode is subject to radio licensing restrictions for Short
Range Devices in the EU and possibly other countries.
It is the responsibility of the user to ensure that the red
Power (PWR) marker locate mode is only enabled in
countries where radio licensing restrictions do not apply
at the operating frequency of 169kHz. If required and
permitted, use the RD Manager software package to
enable this frequency.
Markers can be disabled using the Marker setup menu,
see Section 2.3.2 . Disabled markers are not available
to be selected and will not be displayed.
Markers can also be permanently disabled in the locator
by using RD Manager. Refer to its operation manual for
further information.
5.1.3 Combined mode
In combined mode the locator is used to locate buried
conductors (pipes or cables) and the selected marker
simultaneously.
In this mode, the left/right arrows indicate the buried
conductor position while the bargraph, numeric display,
and audio response indicate the amplitude of the
received marker signal.
To enter combined mode:
1 Press the key to select dual mode. The display
will show the null locate features.
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