Radiodetection SuperCAT 4+ User Manual page 7

Signal Clamp (optional extra)
The optional Signal Clamps can be used to apply a
T1 locate signal safely to a cable or pipe up to
215mm (8.5") in diameter without interrupting
the supply. Signal clamps are not suitable for connecting
around lamp posts.
Procedure
With the T1 switched off, plug the Clamp lead into the accessory
socket. Place the Clamp around the pipe or cable ensuring the jaws
are completely closed.
Switch the T1 on, then open and close the Clamp. If the jaws are
closing correctly there will be a change in tone as the jaws are closed.
An earth connection from the T1 is not necessary but optimal signal
transfer is only generally achieved if the target line is grounded at both
ends. This is usually the case with power cables.
WARNING! To avoid the risk of electric shock, the signal
clamp must be connected to the transmitter before being placed
around the pipe or cable.
Locating a sonde
The SuperCAT4+ locators are capable of locating a Radiodetection
sonde. Before attempting to locate a sonde ensure that the sonde's
batteries are fully charged. Radiodetection recommends using new or
fully recharged batteries at the beginning of each day and preferably
at the start of each job. Also check that the locator is operating at the
same frequency as the sonde and that they are both working correctly.
To test the locator and the sonde, position the sonde at a distance
equal to its rated depth range from the locator. Point the locator at the
sonde with its blade parallel to the direction the sonde is travelling.
Check that the bar graph shows more than 50% at high sensitivity
Note: The blade of the locator must be in line with the sonde; this
is the opposite to Active line locate method.
Procedure
1. Attach the sonde to the rod and insert it into the drain or duct to
be mapped. Keep the sonde just in view.
2. Hold the locator vertically directly over the sonde with the blade in
line with the sonde's orientation.
3. Adjust the sensitivity of the locator to give a bargraph reading
between 60-80%.
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A sonde radiates a peak field from the center of its axis with ghost signals
at each side of the peak. Move the locator to one side and then along the
axis of the sonde forwards and backwards to detect the ghost signals.
Radiodetection recommends locating the ghost signals as finding
them confirms the position of the main peak. To lose the ghost signals,
reduce the sensitivity of the locator; this should leave only the main
peak signal detectable.
With the locator sensitivity set as desired,
propel the sonde along 1m (3-4 feet) and
stop. Place the locator over the estimated
position of the sonde and:
1. Move the locator backwards and
forwards with the blade's orientation
parallel to the sonde.
2. Stop when the bar graph indicates a
clear peak.
3. Rotate the locator as if the blade were a
pivot, stop when the display indicates a
clear peak response.
4. Move the locator from side to side until
the bar graph indicates a clear peak.
5. When the locator locates a peak signal,
it will automatically calculate the depth
of the sonde. Observe the depth reading
while moving the locator from side to
side; the lowest reading will be the
correct location.
Repeat each step in smaller increments with the locator blade resting
on or near the ground. The locator should now be directly above the
sonde with the blade parallel with the sonde; mark this position.
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