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is at right angles to the measured pipeline. When the receiver response increases, it
means that there is a pipeline. Stop and position the pipeline accurately. Mark the location
of the pipeline and trace the pipeline until it leaves the detected area. Then return to the
area and continue network scanning.
Mark each pipeline location that has a signal response, then trace the portion of the
pipeline outside the area and mark it.
3.Inductive Search
Inductive search is the most reliable technique for detecting unknown pipelines. This
method requires a transmitter, a receiver, and two inspectors. This search method is
called "two-person search method." Before starting, determine the areas to search for
and the possible directions through which the pipeline passes. Turn on the transmitter,
select the working mode as inductive connection and the same frequency. One inspector
operates the transmitter and the other operates the receiver. Apply the signal to the
pipeline when the transmitter passes through the pipeline and the receiver can detect the
signal 20 meters upstream or downstream of the transmitter. The direction of the
transmitter is consistent with the estimated direction of the pipeline. One person holds the
receiver at the beginning of the area to be searched and the direction of the antenna of
the receiver is kept perpendicular to the direction of the possible underground pipeline.
The receiver is adjusted to the highest sensitivity that will not receive the transmitter
signal directly from the air. When the direction of the transmitter and receiver is correct,
the two operators move forward in parallel. The operator
carrying the receiver moves
the receiver back and forth while moving forward. The transmitter applies the signal
to the pipeline directly below and the receiver detects the signal.Mark the ground at
the receiver's detected peak position. Repeat the search in other directions where
there may be a pipeline crossing.
Содержание HZ-5000
Страница 1: ...HZ 5000 Underground Cable Detector User Manual Huazheng Electric Manufacturing Baoding Co Ltd...
Страница 35: ...33 Figure a Illustration of Deeper Pipes Figure b Illustration of T Branch Pipe...
Страница 36: ...34 Figure c Illustration of the Pipe that Changes Directions Figure D Illustration of Detection of Pipe Ends...
Страница 37: ...35 Figure e Illustration of Detection under Steel Mesh Net Illustration of Depth Measurement...
