F
C
F
C
13
14
3.1.4 Detect the laid metal tap water pipe and metal heating pipe
Preconditions:
The pipeline must be made of metal materials (such as galvanized steel pipe);
※
The pipeline to be detected should not be grounded. There should be a relatively
high resistance between the pipe and the soil (otherwise the distance of detection
will be very short);
※
Use a connection wire to connect the"+" socket on the transmitter to the pipeline to
be detected.
※
The detection of laid tap water pipe and heating pipe is shown in Fig.3-1-4a and
Fig.3-1-4b respectively:
※
Fig 3-1-4a
Fig 3-1-4b
For the sake of safety, the power
supply of electrical euipments
must be turned off.
1.The grounding end of the trans
mittershould be a certain
distance away from the pipeline
to be detected. Ifthe distance is
too short, the signals and the
circuit cannot be precisely
located.
2.Adjust the transmitting power
of the transmitter to adapt to
different radiuses of detection.
3.1.5 Locating of line interruptions using two transmitters
When locating a line interruption using one transmitter to feed from one conductor end, the location
of interruptions may not be precisely located in case of bad conditions due to a field disturbance. The
drawbacks described above can easily be avoided when one uses two transmitters (one from each end)
for line interruption detection. In this instance, each of the transmitters are set to a different line code,
e.g. transmitter one to code F and the other to code C. (A second transmitter with a different line code
is not included within the scope of supply and, therefore, has to be ordered separately.)
Preconditions:
The current circuit must not be
live.
※
All lines not being used must
be connected to the auxiliary
ground as shown in Fig.3-1-5.
※
Connect both transmitters as
shown in Fig. 3-1-5.
※
Proceed as described in the
application example.
※
If the transmitters are connected in accordance
with Fig. 3-1-5, the receiver indicates C on the
left side ofthe line interruption. If the receiver
goes beyond the interruption position towards
the right, it will display F. If you are directly
above the interruption,no line code is displayed,
due to the overlapp ing of both transmitter
signals.
1. Adjust the transmitting
power level of the
transmitters adapt it to
different detection radiuses.
2.The target position can be
precisely located by your
setting of the manual mode
of the receiver and selecting
of the proper sensitivity.
1.Full grounding should be ensured.
2.The transition resistance of a line interruption must be higher than 100k 0hm.
3.The ground connected to the transmitter can be an auxiliary ground, earth from
an earthed socket or a water pipe which is properly earthed. When tracing line
interruptions in multi-core cables, note that all remaining leads in the shielded
cable or conductor must be grounded in accordance with the regulations. This is
required to avoid cross-coupling ofthe fed signals (by a capacitive effect to the
source terminals). The tracing depth for the shielded cables and conductors are
different, as the individual leads in the shielded cables are twisted around
themselves.
3.In the process of detecting the pipeline, the stronger the signals displayed on the
Nixie tube of the detector, the closer the pipeline detected by the detector.
4.Select the manual mode on the receiverand select suitable receiving sensitivity to
precisely locate the pipeline.
5.To detect a pipeline that is made of non-conductive materials, it is suggested to
insert a metal helical tube into the pipeline first as described in Section 3.1.3.
Fig 3-1-5
Your excellent helper in measuring instruments
.
Your excellent helper in measuring instruments
.
CAUTIONS
HINTS
CAUTIONS
HINTS
