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Eliminating adjacent cables or pipes ('Nulling out')
In some applications a cable or pipe carrying a signal can mask
adjacent utilities. For example, a large locate signal could be flowing
along a large cable that is running close to a second cable with a
smaller signal. In this situation C.A.T4 can be expected to locate the
signal from the larger cable but may not locate the second cable. To
locate the second cable carry out the following:
1.
Using the Genny4 in induction mode, place the Genny4 on its
side directly over the large cable, and in-line with its direction as
illustrated.
2.
The cable beneath the
Genny4 should now have
no locate signal transmitted
to it, but other cables in
the vicinity should have the
Genny signal transmitted
to them and may now be
located with the C.A.T4.
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Estimating line depth using the C.A.T4+/eC.A.T4+/gC.A.T4+
and Genny4
Do not use the C.A.T4+, eC.A.T4+ or gCAT4+ depth estimation
function to decide if mechanical digging is appropriate.
Depth estimations are only possible when using the C.A.T4+,
eC.A.T4+ or gC.A.T4+ in Genny mode.
If using the Genny4 in induction mode, ensure that the depth
estimation position is at least 10m from the Genny. If using direct
connection or a signal clamp, this distance can be reduced to
approximately 5m. Once
a cable or pipe has been
located, position the C.A.T
above its position and at right
angles to its direction.
Press and release the depth
button. The display will show
the estimated depth to the
detected conductor.
Do not estimate depth near a
bend or tee in a cable or pipe.
dyNAM I C ovE r LoAd pr oTE CTI oN
All C.A.T4 models incorporate Dynamic Overload Protection, a powerful
signal processing tool that identifies and automatically rejects electrical
interference that may otherwise overload the C.A.T's electronics.
Dynamic Overload Protection allows the operator to locate pipes
and cables in electrically noisy environments such as near power sub
stations or near overhead high-voltage cables. Note that Dynamic
Overload Protection will not overcome very high levels of interference. In
this situation the Signal Overload Warning will appear (see Warnings).
G pS /G N S S opE rATI oN
gC.A.T models are equipped with an internal GPS/GNSS positional
receiver module which adds positional data to the internal logging system.
When the unit's trigger is pulled, the positional module activates and
will try to lock on to the satellite positioning system. The locking time will
vary depending on a number of factors such as the area being located,
the weather conditions and the time of day, but generally this should be
less than 2 minutes.
The GPS icon on the screen will flash until the module has acquired a
satellite lock, at which point it will remain constantly visible.
Minimum 10 metres
recommended
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