Glomar C.A.T4 Handbuch Seite 8

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.
estimating line depth using the C.a.T4+/eC.a.T4+
and Genny4
Do not use the C.A.T4+ or eC.A.T4+ depth estimation
function to decide if mechanical digging is appropriate.
Depth estimations are only possible when using the C.A.T4+ or
eC.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.
Minimum 10 metres
recommended
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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 below).
War N I N G s
signal overload
If the C.A.T4 is used in areas where very large power signals are
present, the signal bargraph will flash. In this condition the sensitivity
control and depth function will not operate and you are advised to try
lifting the C.A.T4 to bring it out of the overloaded condition or use the
C.A.T4 in a different location.
When taking depth readings
Conductor out of range.
Selected mode does not support depth estimations.
Not possible to indicate depth eg, high levels of electrical
interference.
strikeAlert
™
The optional StrikeAlert feature warns the operator of shallow
pipes and cables. To check if your C.A.T4 has StrikeAlert, look
for the StrikeAlert Activation sticker on the side of the C.A.T4.
When a shallow cable or pipe is detected in Power, Genny or Avoidance
Mode, StrikeAlert flashes an asterix and sounds a distinctive warbling
audio tone. StrikeAlert is not activated when tracing Radio signals.
eC.a.T4 and eC.a.T4+only
Warns that a C.A.T is being used too far from the vertical or
moved too quickly for reliable cable or pipe location.
On startup, warns that the C.A.T is due for service in less
than 30 days, followed by number of days until service is due.
If C.A.T is CALSafe enabled, the unit is past its calibration
™
due date. Return for immediate service.
eC.A.T4 and eC.A.T4+ will log warnings when displayed.
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