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the deviation.
In general, the response of the receiver to the target pipeline should be greater than to
the nearby pipeline. The target pipeline can be identified and tracked by the receiver's
response. However, if the adjacent pipeline is closer to the surface, the receiver's
response to the nearby pipeline may exceed the target pipeline. The target pipeline
cannot be identified and tracked only from the response of the receiver. At this time, we
need to measure and compare the current of the signal on the target pipeline and the
adjacent pipeline. The pipeline with the highest current value is the target pipeline to
which the transmitter signal is applied.
If there are several parallel lines and the transmitter cannot be connected directly, each
line can be probed by applying the line signal. Firstly, the whole area is searched by
inductive connection method to find out the number, general position and direction of
pipelines in the area, and marks are made on the ground. Then place the transmitter flat
on the ground and as far as possible in line with the underground pipeline and ensure that
the pipeline is directly below the transmitter so that the signal directly below the
transmitter is zero, but other pipelines can detect it and move along the pipeline. Keep on
moving the transmitter and marking the pipeline position. Finally, the first pipeline is
traced outside the search area until the target pipeline can be accurately positioned.
3.Deepen Pipeline Detection
If the signal detected by the receiver suddenly becomes small during the detection
process, the target pipeline may be branched or the pipeline may become deeper. First,
find out according to the detection method of the T-line whether there is a branch line. If
there is no branch line, the line may suddenly become deeper. Then, stop immediately
and track the position of the pipeline where the signal strength drops rapidly. Adjust to
high sensitivity, center on the signal response falling point and in the radius of 2 meters
operate arc detection.
4.Dealing with Interference Signals
。
Signals sensed from the adjacent pipelines are the most common problems
Summary of Contents for HZ-5000
Page 1: ...HZ 5000 Underground Cable Detector User Manual Huazheng Electric Manufacturing Baoding Co Ltd...
Page 35: ...33 Figure a Illustration of Deeper Pipes Figure b Illustration of T Branch Pipe...
Page 37: ...35 Figure e Illustration of Detection under Steel Mesh Net Illustration of Depth Measurement...
