Glomar C.A.T4 Handbuch Seite 6

select Mode
C.A.T4 models are equipped with four locate modes:
Avoidance Mode ( A ): detects all locate signals simultaneously,
including Genny, Power and Radio signals. The sensitivity
control adjusts the Power, Radio and Genny signal levels
simultaneously.
Genny Mode ( G ): detects the locate signals produced by a
Genny. There are various ways of applying the Genny signal
(see 'Using the Genny4'). Using a Genny is the most reliable
way to detect a pipe or cable. The C.A.T4 and Genny4 feature
new locate signals that make the combination more sensitive to
small core cables (e.g. telecoms & street lighting).
Power Mode (
P ): detects signals originating from power
transmission networks. These signals may be found on any
pipe or cable, not just power cables.
Some power cables DO NOT radiate detectable
power signals.
Power signals may not be found on power cables
that are switched off (e.g. a street light cable during
daylight hours). Always use a Genny before excavating.
Radio Mode ( R ): detects radio signals originating from distant
radio transmitters as they travel along underground pipes and
cables.
Radio signals are not always present. Always use
a Genny before excavating.
U s I N G Th e C.a.T4
Hold the C.A.T4 with the blade vertical and with the lower edge just
above the ground. Do not swing the C.A.T4 or tilt it more than a
few degrees from the vertical. Swinging the C.A.T will affect locate
accuracy; eC.A.T4 and eC.A.T4+ models feature SWING, a sensing
device to remind operators to use the C.A.T correctly.
locating cables and pipes
The sensitivity control is used to narrow the field in which the C.A.T4
can locate a pipe or cable. The sensitivity control should be set to
maximum before beginning to locate.
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In all locate modes the
bargraph and sound levels
increase as the C.A.T gets
closer to a pipe or cable,
and reduce once it passes
beyond it or as it gets further
away.
As the bargraph readout
passes maximum over a pipe
or cable, turn the sensitivity
control down and move back
over the locate position. By
repeating this process back
and forth across the maximum readout position, the cable or pipe's
position can be pinpointed. The tidemark feature hold the maximum
bargraph reading to ease identification of a peak readout.
If the position cannot be easily determined using Avoidance Mode,
switch between the dedicated locate modes (Genny, Power or Radio)
before adjusting the sensitivity control to pinpoint the cable or pipe.
determining a cable or pipe's direction
Once a cable or pipe's position has been pinpointed, rotate the
C.A.T4 above it. The C.A.T is at right angles across the cable or pipe
when the bargraph and audio are at a maximum, and is directly inline
with it when the bargraph and audio are at a minimum. Check for
accuracy by varying the sensitivity control while rotating the C.A.T.
(This process can be less precise in Power Mode because of the
nature of detectable power signals).
Trace the buried conductor keeping the C.A.T4 vertical and moving
it steadily from side to side. Follow the line of the buried conductor,
marking it as required across the area to be excavated.
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