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VII. Ways of Pipe locating:
1.Applying signal
Underground pipeline detector field source has two kinds: passive and active source.
The passive mode is used to search for an unknown power cable or an underground pipe
to which a cathodic protection signal is applied and a metal line that is capable of sensing
a radio frequency in a zone. The active mode of operation is used to track and locate the
pipeline signals in the area.
1) Passive mode
Passive mode
: The transmitter is not needed for this mode. It can search for the
power cable in an unknown area. Turn on the receiver, select the receiver operating
frequency as50Hz, adjust the gain to get a suitable reading and select the maximum or
minimum method to grid search in a region back and forth search. Carry the receiver to
walk steadily, so that the fuselage surface is aligned with the direction of movement and
try to make it stay into the right angle instead of in the arc swing because it will produce
some misleading signals. When the receiver responds with an abnormality, stop
immediately and precisely position the pipeline and mark it. Traces and marks are also
required for a pipeline that reaches out of the search area.
1.2 The passivecathodic protection current (CPS) signal method:
It does not require
a transmitter to operate. It can search for the underground metal pipe when applying the
external current cathodic protection within an unknown area. Turn on the receiver, select
the receiver operating frequency CPS and use the same method as 1.1.
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...
