User's Manual

24
2M X 2M (1 WINDING) UNIVERSAL
CABLE COIL 8 M PERIMETER
The 8m universal cable coil has to be laid to a single
turn on a metal free frame and has to be xed with
tape for example. This particular search coil covers
four times as much ground as a 1 m x 1 m frame
coil does. It should only be used when searching for
metal objects with a surface of at least 20 cm x 20 cm
pointing towards the coil. Smaller metal objects will
be located less eectively than with a 1m x 1m frame.
This is mainly because it will become more dicult
to pinpoint those smaller objects with the large coil.
The maximum detection depth is very high and can
only be increased with the 12m cable coil arranged
to a 1,5 m x 1,5 m or 3 m x 3 m frame. The 2 m x 2 m
frame coil can be carried by two persons without any
carrying straps at a distance of about 80cm above
the ground. This is particularly useful when trying to
ignore medium sized metal objects which are smaller
than a horseshoe for example. Coins and nails will no
longer be detected when doing this.
The 2 m x 2 m coil acts as a large aerial for medium
wave transmitters. The next coil described will be less
sensitive in general but won‘t suer from electroma-
gnetic interference of transmitters or power lines.
1M X 2M COMPENSATED COIL
(TWO SEPARATE WINDINGS) UNIVERSAL
CABLE COIL 8 M PERIMETER
In order to construct this compensated coil the 8 m
coil cable has to be laid to the gure of the shape of
an eight (8) rst. The coil cable has to be xed on a
1 m x 2 m frame with a center part which divides the
frame into two 1m x 1m frames. The cable has to be
laid and xed twice on the center part as this is the
middle of the eight (8). This type of frame mounted
search coil is about 30% less sensitive than a 1 m x
1 m search coil. This is because of the opposite
directions of the transmitted magnetic eld. During
the receiving phase the two windings of the eight
do also work in opposite. Therefore, interference
and some ground indications are subtracted from
each other and therefore eliminated. Interference
from radio transmitters or power lines will be almost
completely cancelled. This compensated 1 m x 2 m
frame mounted search coil is of great advantage
when locating metal objects in areas where interfe-
rences are often expected. This type of coil has a very
poor sensitivity to small metal objects. The minimum
surface of a metal plate should be 10 cm x 10 cm to
ensure good results when working with this coil. The
LORENZ DEEPMAX Z2 will work very stable with
this particular coil. The following described 1 m x
1 m double frame coil will give much higher detecti-
on depths namely almost the same sensitivity range
as a single 1m x 1m frame but is also capable to
cancel out said EMI (electromagnetic interferences).
UNIVERSAL CABLE COIL 12 METERS
PERIMETER 1,5M X 1,5M (TWO WINDINGS)
OR 3M X 3M (ONE WINDING)
Similar to the 8m universal cable coil this large
cable coil can be arranged to two dierent frame
coils by simply mounting one or two windings on
a metal free frame with tape for example. With the
largest 3m x 3m frame coil the highest possible
detection depths can be achieved. This is mainly
possible because of specially developed electro-
nics to eliminate low frequency interference and a
power pulse circuit built-in the LORENZ DEEPMAX
Z2. The high sensitivity for large and deeply buried
metal objects and the simple elimination of smaller