Search Mode
Description
Signal Transmitter
mode
Used in conjunction with a signal transmitter:
•
To improve the detectability of utilities.
•
To trace a specific utility.
•
To make a depth or current measurement.
☞
Keep in mind the following:
•
Higher frequencies couple onto utilities more
easily than lower frequencies.
•
Higher frequencies travel shorter distances; the
higher the frequency the less the distance trav-
elled.
•
Higher frequencies are likely to couple onto
other utilities; the higher the frequency the
greater the spread.
•
Higher frequencies are useful for avoidance
activities.
Example:
A 33 kHz frequency has a greater ability to couple
onto other utilities.
Sonde
Used in conjunction with a sonde:
•
To trace the route of a pipe or duct, including
non-metallic variants.
•
To locate a blockage or collapse.
•
To make a depth measurement.
☞
Keep in mind that various sondes are avail-
able for specific task-based applications:
•
Sondes with higher frequencies are used for
generic pipe or duct tracing.
•
Lower frequencies (512 Hz, 640 Hz) work best
for metal pipes.
Press the Function key on the locator keyboard to select a search
mode.
WARNING
The absence of a positive indication does not guarantee the non-existence of a
utility.
Utilities without a detectable signal may be present.
The locators can only locate non-metallic utilities such as plastic pipes, typically
used by the water and gas utilities, with the use of appropriate accessories.
Precautions:
▶
Always excavate with care.
How to select a
search mode
24
Operation of the Locator
