User's Manual

18
In order to get further information from the buried
metal object the metal classication can be used.
The two metal classication features oered with
the LORENZ DEEPMAX Z2 are based on dierent
working principles. The time delay/ conductivity
reading is static therefore no motion of the coil is
required to make a reading 000 to 099 possible.
This is especially of great advantage when identi-
fying deeply buried metal objects with the highest
sensitivity possible. The calibrated metal classica-
tion will directly display the time delay with all coils
connected. This conductivity reading is very precise.
It will be stored as long as the coil is over the metal
and will disappear when passing the metal with the
coil. The FERROUS / NON-FERROUS indication will
only appear with the 26 cm or 35cm double D coil
connected. Weak signals which are out of the range
of the metal classications can’t be identied.
When having located a metal object proceed as
described in the following steps: Slowly move the
search coil from the side at constant height towards
the located metal. Try to nd the centre of the metal
object with the audio signal. As soon as a certain in-
tensity of the audible signal is reached a time delay
reading will be performed by the LORENZ DEEPMAX
Z2 automatically. This will be indicated with a num-
ber between 000 and 099 on the screen.
Compare the displayed number with the following
table. Therefore, the search coil has to be held over
the metal in order to store the conductivity value.
For better accuracy the conductivity reading can
be repeated. Therefore, the coil has to be raised in
the air or moved to the side until the rst reading
disappears. Afterwards the coil can be lowered to
the ground towards the metal until another reading
is performed by the LORENZ DEEPMAX Z2.
conductivity
reading
possible
metal object
0-10
coin, ring, ring pull, aluminium foil,
small coin
10-20 small bronze-coins, silver-coin
20-30 soft drink-can, small pieces of iron
30-50 ferrous metal objects, nails
50-60 iron-box, bigger objects made of iron
60-80
medium sized bronze, copper,
silver-objects
80-99
big bronze, copper, silver,
aluminium, gold objects
Especially when expecting very strong signals and
mineralized soils at the same time it is often ad-
visable to hold the coil at a higher distance over
the ground. This will help to ignore magnetic soils,
because the coil is out of the range of the ground.
This will increase the performance and accuracy
of the classication circuit and makes it easier to
locate and identify these metal objects. In most ca-
ses however a special circuit will suppress the false
readings derived from magnetic soils eectively.
When expecting very deep metal objects it will
sometimes not be possible to perform a reading
because the indication is always about 30 to 50 %
less sensitive than the audio signal or the intensity
bar graph.
9. METAL CLASSIFICATION