sewerin Duophon, Operating Instructions Manual

Page: 39 / 47

37
5.2.2 Determination of the pipe position
When a pipeline is energized a magnetic field of force is created
ring-shaped around the pipe. To locate this field of force proceed as
follows:
• Connect search coil type FS 3A to the DUOPHON®
receiver (Item 15)
• Connect earphones (Item 9)
• Turn rotary switch (Item 13) into position 13.4 or
• Turn rotary switch (Item 13) into position 13.3 and push
microphone key (Item 8) (when power carrying cables
and cathodically protected pipes are concerned)
• Move search coil along the pipe’s trace.
Don’t let the search coil swing around the handle -
wrong values would be indicated !
MINIMUM METHOD
When the minimum method shall be applied the search coil will be
clicked into 0 degree position (Refer to pict.5)
Pict. 5
Minimum Method
The magnetic field of force produces the signal course as pictured
above. This can be controlled via the meter (Item 16) and the
earphones (Item 9).