sewerin Duophon, Operating Instructions Manual

Page: 41 / 47

39
DEPTH DETERMINATION
Before the depth determination the exact position of the pipe must
be detected with the minimum method. Then the search coil will be
clicked into 45 degree position for the depth determination (refer
to pict.7).
Pict. 7
Depth determination
As marked in the picture 2 minima can be detected at the right and
at the left side of the pipeline.
The distance between the trace and one of the minima is the depth
where the pipe has been laid.
In case the magnetic fields of force are not exactly circular half the
distance between the two minima mark the depth of the pipe.
5.2.3 Localization of non-metallic pipelines
Non-metallic pipelines (like thos of PVC, PE, asbestos-cement,
concrete or stone) can be detected by means of the SEWERIN
Glasfibre Probe System GFS/GSK. This system is connected to the
galvanic outlet of the
DUOPHON® (Item 6) which is used for direct
energizing.