TIANJIN GREWIN TECHNOLOGY CO.,LTD.
Web:www.grewin-tech.com Wh86-13072088960
Email:[email protected]
TIANJIN GREWIN TECHNOLOGY CO.,LTD.
Address:
2# MeiNian Plaza No.16 DongTing Road,Hexi Distr,300222,Tianjin China
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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.
1.3 Radio frequency detection mode:
It is mainly used to detect the metal pipeline that is
sensitive to the radio frequency.
2)
Active mode
The active source operates by applying a signal of the specific frequency from the transmitter
to the pipeline, and then positioning and tracking the pipeline with the receiver. Using the active
mode can not only locate the pipelineaccurately, track the pipeline and measure the depth, but
also detect the coating damage pointson the underground pipeline accurately and determine the
size of the damage point of the coating.
Two methods: direct connection and inductiveconnection. Direct connection is the ideal way
to track the pipeline while the inductive connectionis the most convenient way to find the
underground pipeline in the region.
(1) Direct Method