Lorenz Z2 Series User manual

1
Lorenz Detecting Systems GmbH & Co. KG
Röpkestrasse 12
30173 Hannover Germany
Phone: [phone]
Fax: [phone]
[email protected]
www.metaldetectors.de
www.deepmax.com

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USERS MANUAL
USERS MANUAL

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CE/FCC DECLARATION OF CONFORMITY/EMC DIRECTIVE
The following metal detector LORENZ DEEPMAX Z2
Correspond to the following EC requirements:
EC-EMC-directive version 89/336/EEC
The LORENZ DEEPMAX Z2 series are found to meet the
specication requirements detailed, when tested to the
customers/ specication requirements.
Compatible norms are in particular
Test Specications & Categories
Emissions EN55032.2015
Immunity EN61000-6-1:2007
FCC Part 15.107/15.109, ICE003 (FCC 15 B)
If any changes are made to the above mentioned appliances
without consulting Lorenz Detecting Systems GmbH & Co. KG
this declaration becomes invalid.
Lorenz Detecting Systems GmbH & Co. KG
General Management
Röpkestr. 12 · 30173 Hannover · Germany
All images and text in this instruction manual, as well as the instruction
manual itself are copyright protected, any further use must be approved
in writing by Lorenz Detecting Systems GmbH & Co. KG

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INTRODUCTION
Our aim at Lorenz: to build a most compact and
powerful metal detecting machine. The LORENZ
DEEPMAX Z2 series detectors are some of the ne-
west developments in the eld of Pulse GBS metal
detectors made in Germany. It is probably one
of the most sensitive and stable metal detecting
devices of its kind presently available. The LORENZ
DEEPMAX Z2 is the result of many years of research
and development. Worldwide many successful
Deepmax users hold a complete new compact and
rugged designed electronics device in their hands.
An all new control housing with anodized alumi-
nium machined from a single piece of aluminium,
latest controllers and analog to digital converters
are in use with this particular detector model. The
detection range for natural gold and other non fer-
rous metal objects has been improved. A dierenti-
al electromagnetic noise cancellation with new coil
designs make this device very useful in areas where
a lot of interferences from power lines are present.
The complete transmitting and receiving circuitry
was renewed in order to achieve even more stability
and sensitivity.
The Pulse GBS (Ground Balancing System) is espe-
cially suitable for searching at depth. The perfor-
mance of this electronic device is almost unaected
by salt water, most types of mineralized grounds or
temperature changes. Specially designed elec-
tronics cancel out signals from the ground while
oering stable signals from the metal objects. This
model oers a great range on non-ferrous metal ob-
jects in general. The DEEPMAX Z2 is a reliable tool
to locate even under the worst environmental con-
ditions. A new improved circuit design suppresses
interference from power lines and a power pulse
technique produces very accurate signals to obtain
very high detection depths. For this purpose
a power PST (Pulse Shaping Technology) was added
in order to improve the performance and depth
capabilities. The complete power management with
ecient low electromagnetic interference conver-
ters and low self discharge batteries makes this de-
tector even more exible for worldwide operation.
The LORENZ DEEPMAX Z2 is a high quality specialist
metal detector and it is designed to be used with
both, small or large coils. Large coils oer extreme
depth capabilities for big metal objects because of
the strong and deep going magnetic eld pro-
duced while small coils are preferably used when
searching for small objects like single coins or gold
nuggets. Metal identication features have been
improved as well as the coils and accessories in
order to give better results in the eld.
A very simple operation is guaranteed by a specially
developed LC Display and a minimum amount of
controls. At the same time this detector model of-
fers a number of features which are new for a pulse
metal detector. Quality electronics and very special
designed electronic - circuitry produce benets in
terms of ease of use as well as sensitivity.
The DEEPMAX metal detectors are often recognized
as representing some of the highest quality and
newest developments in professional metal detec-
ting equipment. We as a manufacturing company
always try to keep the highest standard on our pro-
ducts, therefore alternations of the design, speci-
cations as well as the availability subject to change
without notice.

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1. SAFETY INFORMATION
For reasons of safety it is advisable to read this ope-
rating instruction manual rst before turning the
LORENZ DEEPMAX Z2 on. Special attention should
be paid to the following notes.
Check out, if the fast charger supplied with the
DEEPMAX Z2 ts with the AC mains of your country.
See chapter 12 for more detailed information. The
supplied recharger will work at AC voltages of 100-
240 VAC.
Damaged connecting cables or search coils should
no longer be used, because of possible electrical
shock.
To avoid short circuits, wrong polarity or electrical
shock only spare parts and accessories oered
by the manufacturer of the LORENZ DEEPMAX Z2
should be used. When headphones are in use plea-
se reduce volume to protect your ears.
When digging for metal objects unexploded ord-
nance could also be found. Precautions should be
taken in advance especially when big objects have
been located.
Special kinds of mines could be triggered by the
strong DC magnetic eld produced by the search
coil. Persons with implanted pacemaker or other
sensitive device should not approach to the eld
of the search coil. Please understand that we as the
manufacturer of the LORENZ DEEPMAX Z2 cannot
be made liable for any kind of damage caused by or
in conjunction with our products.
Design and specications subject to change
without notice!

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The LORENZ DEEPMAX Z2 is based on the non- mo-
tion; Pulse GBS (Ground Balancing System). Short
and intensive magnetic pulses are emitted by
means of a search coil rst. Those magnetic pulses
produce eddy currents in conducting materials like
metal objects for example. Said eddy currents will
be kept in a metal object and will die away after
the magnetic pulse emitted by the search coil has
turned o. This is the reason why it is possible to
detect those eddy currents during the time delayed
receiving phase by means of the same search coil
which now acts as a receiving coil. A rather com-
plicated electronics circuitry is necessary to detect
those tiny voltage changes and has to separate that
particular signal from interference also received.
The signal has to be amplied to drive an audio
stage with voltage-controlled oscillator (VCO),
which emits an audible signal either by headpho-
nes or built-in loudspeaker when a metal is in the
near of the eld of the search coil.
Eddy currents produced in a metal object by means
of a pulsed primary eld, will die away dierently
depending on the conductivity of the metal object.
The metal classication circuit therefore gives a
visual time delay reading for the eddy currents
received over a certain period of time. In addition,
a ferrous/ non- ferrous indication for a metal being
detected is working when a double D coil is in use.
This gives further information on the probable kind
of metal being located as well as the audio sound
emitted, which makes it easy to predetermine the
exact place and the size of the buried metal object.
The Pulse GBS principle has got the advantage of
using large diameter coils and high transmitting
power. This is especially necessary when searching
at depth. Frame mounted cable coils of dierent
size and shape can be connected to the LORENZ
DEEPMAX Z2 without any adjustments. A special
adaptation circuit has been added to the detector
to suit with ve dierent coil systems automati-
cally. This ensures best performance with any coil
connected. When enlarging the search coil diame-
ter, the sensitivity to bigger objects will also rise. At
the same time smaller objects will be located less
sensitive. It is possible to eliminate some unwanted
objects like nails and foils or to identify them as
being small unwanted objects while searching for
bigger and deeper objects. Even in dicult soils
where magnetic iron oxides are present the LORENZ
DEEPMAX Z2 will oer extreme depth capabilities
for both ferrous and non-ferrous metal objects
when the Ground Balancing System is in use. Other
systems often suer from ground eects which
reduce the depth range in the ground.
The LORENZ DEEPMAX Z2 will be able to locate
objects at almost the same depths either in most
types of ground or »in air tests«. The high sensitivity
of the DEEPMAX Z2 to non- ferrous metal objects
like gold, silver and copper together with the metal
analysis make this detector an outstanding device
for many dierent locating purposes.
The DEEPMAX Z2 gives a visual indication on the
LC Display for every metal being located. This time
delay reading producing a number between 000
and 099 helps to classify metal objects. The metal
classication circuitry is only in some cases aected
by the size of a metal object and therefore identies
small coins as well as large pieces of metal. The LO-
RENZ DEEPMAX Z2 also oers a sophisticated and
rened ferrous / non- ferrous metal analysis which
works more stable on dicult soils in conjunction
with the 26cm or 35cm double D search coil. De-
tection depths achieved in air tests are almost the
same in many types of soils and therefore consi-
derably higher than those possible with standard
pulse induction or sine wave VLF - TR Detectors.
The DEEPMAX Z2 was developed to provide a num-
ber of features including high sensitivity and sta-
bility together with easy operation. The amount of
2. FUNCTION / APPLICATIONS

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controls was therefore reduced and a calibration of
the detector to our factory settings was also made
to guarantee best results in the eld. The LORENZ
DEEPMAX Z2 was developed for professional search
and locating applications.
A variety of search coils can be connected to this
metal detector. Large areas can be detected eecti-
vely especially with frame coils. Saltwater, most types
of ground or temperature changes will only slightly
aect the detection range of the DEEPMAX Z2.
Highly sensitive to all kinds of metal
Stable operation on mineralized ground or salt
water with Pulse Ground Balancing System
Reliable / simple operation with few controls and
customized LC Display
Exact pinpointing with large coils
Very easy and eective detection of large areas
Rugged, rened mechanical construction with
water and dust protected electronics unit
A variety of search coils are available for dierent
detection purposes
Automatic adaptation of dierent coil sizes and
coil designs to the electronics
Small unwanted metal objects can either be
identied or eliminated
Fast audio response speed with dierent settings
Logarithmic audio response and intensity bar
graph reading for easy pinpointing
Battery check with audio alarm tone
Calibrated static (non-motion) metal classica-
tion with visual conductivity/ time delay reading
Improved ferrous/ non-ferrous identication
Precisely adjustable audio-threshold
Stable static response (acoustical and visual)
Waterproof search coils
Rechargeable low self discharge NiMH batteries
for worldwide operation
Additional Battery + GPS module (Power Bank)
can be connected to double the battery capacity
Fast charge electronics for worldwide operation
100-240V AC/50-60Hz
Car charger for 10-30V DC supplies available
Frequency and Filter function for low frequency
EMI interference reduction
New dierential inputs with new coil designs
for interference elimination
Automatic and manual ground calibration
retuning facility
Dierent Delay and Sensitivity settings to elimi-
nate small objects or for easy pinpointing
Extreme detection depths for very large metal
objects
Specialized on gold and improved detection
range on small, low conducting metal pieces
Low frequency interference elimination circuitry
for less low frequency interference
Enlarged dynamic range for extreme ground
signals and easy pinpointing
Single or dual, induction balanced or dierential
coil designs can be connected
Easy to use multi channel data logger function
works with additional Hard- and Software to gene-
rate six 2D image and six 3D surface maps from the
scans being taken. Each map is dierent depending
on the electronic analysis method and therefore
can be the key to the probable kind of metal buried
in the ground
GPS based meter and compass heading informa-
tion, makes it easy to work with the data logger
Signal strength bar graph, time delay reading,
ferrous/ non-ferrous icons, battery condition and all
the mode settings are displayed simultaneously on
a large LC Display

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On the front panel of the LORENZ DEEPMAX Z2
there are three push buttons to change or alter the
functions, retune the Z2 to the ground or storing
eld data when the data logger is turned on:
ZERO retunes the Z2 or starts the two step auto
ground function when pressed for a longer duration.
MENU/ GADJ opens the Menu or starts the manual
ground adjust when pressed for a longer duration
and a GND function is currently active.
OFF/ FIELD turns the detector o or stores the eld
data when data logger is on.
1. Pull the two carrying straps of the belt pad
through the gaps of the control housing and the
pad again. Mount the two plastic connectors at the
two sides that they are secure and will not come o.
Fix the smaller straps at the top of the Z2 control box.
Put on the complete carrying straps with the two
belt pads and adjust all straps to comfortable lengths.
2. Mount the search coil with the lower bre glass
rod, x the other two rods and adjust to t to your
length. Make sure that the connection cable is laid
around the rods without any tension.
3. Connect the coil to the Z2 electronics unit after-
wards. If additional Battery + GPS module is in use,
fasten the same by sliding it from the top in the two
mounting plates at the rear belt pad and connect
the same with the Z2. Disconnect everything when
planning to store.
4. Press MENU and OFF for 2 seconds to turn on
the Z2, when LOW BAT appears in the display char-
ge the battery rst. With OFF the Z2 can be turned
OFF again.
5. To start the automatic two steps Ground Balance
hold the coil in the air horizontally and about one
meter from the ground and press ZERO until a high
beep sound is coming. Afterwards lower the coil
to the ground at a place with no metal and press
ZERO again until a second low beep sound appears,
while keeping the coil steadily in the same position.
Arrows pointing up- and downwards indicate the
position of the coil. While searching it might be
necessary to press the same ZERO button shortly to
recall the audio threshold setting during operation.
3. LORENZ DEEPMAX Z2 INSTRUCTIONS

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6. Select the dierent functions by pressing MENU
shortly jumping to the next function or going back-
wards while pressing MENU for a longer duration.
7. Select the values with ZERO upwards and with
OFF downwards quickly pressing the same button
repeatedly. After three seconds the Icons will stop
to ash automatically. Press MENU again in order
to change functions. Most functions have a lower
sensitivity/ intensity in position 1 as a higher setting
like 4, 5 or 9 will result in a higher sensitivity/ inten-
sity/ brightness/ loudness/ frequency…
When a search coil has been exchanged, the unit
has been turned o, or the automatic two steps
Ground Balance has not been activated a PRESET
Ground balance corresponding to the various
coils and standard magnetic soil conditions will be
always active in the GND modes! During operation
the automatic Ground Balance can be performed
from time to time on the ground at dierent places
or on single magnetic stones.
FUNCTIONS / SETTINGS
DEL 1-4 All metals and ground mineralization
will be indicated in this DELAY mode. Position 1
and 2 indicate large metal objects well but reduced
sensitivity for small metal objects will be realized,
while 3 and 4 will also provide a good sensitivity
range for small coins/ foils in addition.
GND 1-6 All metals are indicated while minera-
lized soils are eliminated in these GROUND modes
(GND= Ground eliminating function turned on).
Setting 3 to 6 provide the highest sensitivity range
for all types of metal.
GND 1 medium to high conductivity objects like
big non ferrous metal objects will be indicated well,
low conductive coins and foils will be indicated with
a poor sensitivity in this mode.
GND 2 low conductivity objects like coins and
foils will be indicated well.
GND 3 low and high conductivity objects will be
indicated as GND1 + 2 works simultaneously.
GND 4 very low conductivity metal objects like
small nuggets and foils will be indicated very well.
GND 5 very low to very high conductivity metal
objects will be indicated as GND1 + 4 works simul-
taneously.
GND 6 high sensitivity mode for all metals but
only for use with double D coils on low/ medium
mineralized soils. For highly mineralized soils refer
to GND 1-5.
Note: It is possible to choose either from the DEL
(DELAY) or GND (GROUND) settings, it is therefore not
possible to work in both modes at the same time.
FILTER reduces the amount of interferences
produced by power lines radio transmitters, 0 gives a
very fast response speed but no lter at all and 5 will
oer a low interference but slow response speed. Use
low settings with small coils and higher settings with
large coils. Before using a higher Filter setting adjust
the FREQ (FREQUENCY) rst, in order to reduce the
amount of interference.
AUTO in position 5 the detector will automa-
tically retune the audio threshold to changing
ground or temperature conditions quickly. In
position 1 the detector very slowly adjusts itself and
in position 0 this automatic tuning is o which is
recommended especially with large coils to achieve
high detection ranges. In some cases at position 0
the ZERO control has to be pressed more frequently
to achieve an audio threshold.

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SENS sensitivity adjustment setting: 1= low
sensitivity and 5= high sensitivity
VOLUME settings: 0 no audio and 9 very loud
DLOG turns on in position 1 or 2 the built in data
logger function in order to collect eld data to pro-
duce colour maps with the optional Software and
accessories like USB data transfer cable and Battery
+ GPS module (Power Bank). Please refer to chapter
14 for further details.
FREQ Operating Frequency can be altered to
any position in order to provide steady audio sound
when electromagnetic interferences from power
lines or radio transmitters are present.
AUDIO the initial ticking rate or threshold sound
can be adjusted from -9 no sound to +9 slow tic-
king/ weak threshold sound. In most cases it is left
in 0 to 3 mid- position in order to have a very weak
audio sound even when no metal is located.
LIGHT the backlight of the LCD can be altered
from 0 o to 9 bright
TONE 1 provides a VCO ticking sound with in-
creasing frequency for all metals (useful with frame
coils in the DELAY modes).
TONE 2 increases volume and frequency simul-
taneously for all metals.
TONE 3 will give in GND 1-5 a high sound for
small non-ferrous metals with low conductivity like
many gold nuggets or foils and a low sound with
bigger nonferrous and ferrous metal objects. In
GND 6 or all DELAY modes a low sound will appear
for all metals. GND 6 will be only active with DD-
coils connected!
TONE 4 provides a low sound with ferrous and
high sound for nonferrous or large (hand sized or
bigger) ferrous metal objects. This function will only
be selectable with DD- coil connected!
TONE 5 While moving the coil quickly over the
ground the Z2 will respond with a low beep for
ferrous and high beep sound for nonferrous or large
ferrous metal objects. This is a motion function
which will only work while moving the coil with a
certain speed over a metal object. Function only
selectable with DD-coil connected!
+ Transmitter boost function, when - is selected
the Z2 will work with normal transmitting power.
When + is turned on the Z2 will work with higher
transmitting power in order to give stronger signals
for deeper and bigger metal objects at the expense
of some battery usage time.

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During operation it is always possible to change
the settings of the Z2. Above the function icons
which will be shown all the time there is an intensi-
ty bar graph, another +/- GPS direction nder and
dierential bar graph indicator which will come on
when dierential coils are connected, data logger
icons, battery indicator, a FErrous/ NON- FErrous
icon (works with double D coil only) and a conduc-
tivity number in order to display the time duration
of the eddy currents produced in a detected metal
object.
000-099 CONDUCTIVITY /
TIME DELAY READING
The number for the conductivity/ time delay mea-
surement is static and will come on when certain in-
tensity is reached and stays on as long as the coil is
over the metal. A time delay reading which is main-
ly derived from the conductivity, permeability and
the objects size is displayed with a specic number
on the LC Display. Any metal object detected will
give a specic number (000 to 099). Therefore, a
certain intensity of the metal signal is necessary for
a time delay reading. The number simply appears
when a reading was possible. The indication will be
stored as long as the search coil is over the metal
and turns o when the search coil passes the same.
Possible indications without guarantee:
000-035 low conductivity
like small coins nuggets, foils
040-060 medium conductivity
like ferrous metal objects
065-099 high conductivity
like large non- ferrous metal objects made of
copper, brass, silver for example
FERROUS / NON-FERROUS ICONS
This function does only work with the 26 cm or 35
cm double D- coils. Ferrous metal objects like iron
for example produce a FE indication at the top of
the display and Non-ferrous metal objects like gold
silver or copper or large ferrous objects will result
in a NON- FE icon indication when the search coil
is over the metal. The two icons will turn o if no
4. DISPLAY AND SETTINGS

12
metal is present or no double D coil is connected.
This identication facility is tuned to the ground
with the automatic ground balance. There will be a
minimum speed of the coil necessary since this is a
motion function.
INTENSITY SIGNAL INTENSITY
BAR GRAPH ICONS
The signal strength will be indicated by the way of a
large bar graph in the middle of the LC Display and
an audio response from the speaker or headphones.
+/- GPS DIRECTION FINDER
AND DIFFERENTIAL INDICATOR
It is possible by means of the smaller bar graph with
center indication to nd the direction to walk each
track with data logger turned on and external Batte-
ry + GPS (Power Bank) module connected. It is also
possible to indicate under which part of a search
coil a metal piece is located when a dierential coil
is connected by the same +/- bargraph dot.
ARROW; AERIAL, USB ICONS
These icons will work together with the built-in data
logger function. Optional accessories like USB data
transfer cable, Battery + GPS module (Power Bank)
and Surfer Software will be also necessary when
collecting and displaying eld data. For further
information please refer to the instructions for use
the LORENZ DEEPMAX Z2 with data logger function
and software at chapter 14.
BATTERY ICON
The battery condition will be displayed on the bar
graph with 5 bars located on the top of the display.
Note: The battery condition should be checked with
a search coil connected and after a few minutes of
operation.
BATTERY ALARM LOW BAT
Low battery condition will be indicated by a pulsed
beep sound. The LORENZ DEEPMAX Z2 will turn OFF
automatically a short time after this sound appears
to avoid damage from the batteries.
Recommended settings for small coils (26 cm
to 44 cm diameter) Nuggets/ Coins/ Relics:
Nuggets/ High mineral:
GND3-5, FILTER 1, Auto 0-2, SENS 4-5, Volume 5,
DLOG 0, FREQ 5, AUDIO 2, LIGHT 8, TONE 3
Coin/ Relic single coil:
GND 2-5, FILTER 2, AUTO 0- 2, SENS 4-5, VOLUME 5,
DLOG 0, FREQ 5, AUDIO 2, LIGHT 8, TONE 2 or 3
Coin/ Relic double D coil
GND 2-5 (high mineral) or 6 (low mineral), FILTER 1,
AUTO 0- 2, SENS 4-5, VOLUME 5, DLOG 0, FREQ 5,
AUDIO 0, LIGHT 8, TONE 2 or 3
Recommended settings for large frame coils
(1m x 1m to 3m x 3m) Cache/ Relics/ Meteorites:
Low/ Medium mineral:
DEL 3 or 4, Filter 3, AUTO 0, SENS 4-5, VOLUME 5,
DLOG 0, FREQ 5, AUDIO 0, LIGHT 8, TONE 1, Keep
coil at constant height of 20-60cm over the ground.
High mineral:
GND 2-5, FILTER 3, AUTO 0, SENS 4-5, VOLUME 5,
DLOG 0, FREQ 5, AUDIO 0, LIGHT 8, TONE 1-3

13
5. CONNECTORS / LOUDSPEAKER
COIL JACK
Search coils of dierent size and shape can be con-
nected to this jack. The search coils available for the
LORENZ DEEPMAX Z2 have got coded connectors
to adapt the electronics to the coil automatically.
To connect a coil plug to the electronics make sure
that it is fully pushed in the jack and that the sleeve
is fastened by rotating it clockwise. Note: Some coils
and adapters have been changed and improved
therefore refer to newest Z2 coils only!
HEADPHONES/ CHARGER/ EXTERNAL
BATTERY + GPS MODULE / USB DATA
TRANSFER JACK
The stereo headphones can be connected with the
supplied adapter cable to this jack. Any stereo head-
phones ranging from 8 to 100 Ohms can be connec-
ted. The built- in loudspeaker will be automatically
turned o when headphones are connected.
The built in NiMH battery can be recharged with the
supplied charger when connected to the same jack.
An optional external power supply Battery + GPS
module (Power Bank) will double the battery
capacity when being connected to this jack. At the
same time the GPS will support the Z2 built- in data
logger.
After collecting eld data the same can be trans-
ferred via the same connection to the computer
via an optional USB data transfer cable using the
same jack. It is also possible to update the rmware
of the Z2 by means of the same data transfer cable
connected to a computer and this jack.
Any connectors should be disconnected when the
Z2 is not in use or when planning to store the unit in
order to avoid a slow discharge of the batteries.
LOUDSPEAKER
The LORENZ DEEPMAX Z2 has got a built-in loud-
speaker which gives an audible signal when the
search coil approaches to a metal object. The audio
frequency and volume intensity will change with
the distance between the search coil and metal
for better pinpointing. Especially with two persons
operation and large diameter coils the signal from
the loudspeaker is of great help for both persons.

14
Connect the search coil-connector to the COIL jack
of the electronics unit, and fasten the plastic sleeve
of the connector by rotating it clockwise. At switch
ON the detector runs through a display check
sequence since all the icons come on and indicate
the retuning process is performed by the electro-
nics at the same time. Right afterwards the rm-
ware version is shortly displayed as well. Afterwards
the detector will automatically turn to the settings
which were selected the last time the detector was
in use. While pushing the three push buttons die-
rent settings will be selected and can be altered by
means of the same controls at the bottom of the LC
display.
Hold the connected search coil at constant distance
above the ground and move the coil slowly from
side to side in overlapping manner with the tele-
scopic pole in order to be able to detect even the
smallest metal pieces. Avoid a speed of more than
2 meters per second when moving the coil even
though the response speed of the Z2 is very high in
FILTER settings 1 or 2.
During operation no metal buckles or shoes con-
taining metal parts should be worn. The same with
keys, coins, rings and watches. Every metal carried
by the operator can cause false signals, especially
when they are in the near of the eld of the search
coil. Therefore the electronics control box has to be
carried far away from the search coil, this is especi-
ally important while searching with the large frame
mounted coils but also with the smaller coils. Never
use any metal screws when building frames for the
cable coils.
The loudspeaker will give a ticking or threshold
sound after having retuned the detector with the
ZERO control. The sound can be individually tuned
from silent to a low frequency threshold tone with
the AUDIO settings. This pre-set audio tone will be
recalled every time the ZERO control is pushed. This
has to be done during the rst minutes of opera-
tion due to warming up at places where there is no
metal in the near of the search coil.
6. OPERATING PROCEDURES

15
As the LORENZ DEEPMAX Z2 oers highest sensi-
tivity with correctly tuned electronics, one should
check the threshold tone from time to time during
operation. Although a constant ticking sound is not
always achievable, a threshold tone will give the
operator the information that the detector works
with its highest sensitivity.
Especially for metal classication and ground balan-
cing purposes the electronics need to be tuned for
best results.
The detector is now ready for use and will indicate
a metal object immediately with an audio sound
emitted by the way of loudspeaker or headphones.
The audio frequency will rapidly rise and attains its
highest frequency when the search coil is directly
over the metal. The centre of the search coil is the
part with the highest sensitivity. Even in the direct
near of the metal frequency changes make pinpoin-
ting possible in some tone modes.
When changing the search coil the electronics al-
ways needs to be retuned via the ZERO control with
the two step ground balancing function as descri-
bed in chapter 3. If this is not performed the preset
ground values are in use. When lowering the search
coil to the ground an audio sound may appear,
this can be cancelled by pressing the ZERO control
again shortly. The distance between the search coil
and the ground has to be kept at a constant height
when searching in DELAY modes afterwards. If too
strong signals from the ground are noticed simply
change from DELAY to GROUND functions, after-
wards there will be no or very week indications of
the ground. When working with small search coils
of up to 44cm diameter it is also possible to select
the AUTO function with AUTO 1 for slow and 5 for
very fast automatic tuning in order to retune the
electronics to changing ground conditions automa-
tically during operation. The search coil therefore
has to be moved to achieve a signal from metal
objects. When resting the coil over the metal the
AUTO function will cancel out the signal after a
certain time.
In the DEL modes large diameter coils like the
frame mounted cable coils should be hold at
heights of (10 to 60 cm) over the ground to ignore
magnetic mineralized ground or small unwanted
metal objects. Those coils should be moved slowly
without any up and down movements, parallel to
the ground and at constant height.
In the DEL 1 and 2 mode and especially while using
large diameter frame coils the sensitivity to very
small objects decreases. This is in many cases desi-
rable, although the general sensitivity will be less.
The simplest way to ignore small metal objects is to
increase the distance between the search coil and
the ground. Simply raise the loop and it will still be
possible to locate those deeper and bigger metal
objects.
Be always sure that there is a sucient distance
between the detector or Battery + GPS module
and the frame coil.

16
This chapter is a summary on how to proceed with
the LORENZ DEEPMAX Z2, when locating metal,
while using the two metal classications, intensity
reading and the audio signal. It is therefore in some
cases possible to predetermine the exact position
the size as well as the kind of metal located. When a
metal object is located try to nd the place with the
strongest signal which means highest indication on
the INTENSITY bar graph and highest audio fre-
quency. Size and shape information can be derived
from the audio sound with some experience.
Small objects like single coins will be indicated with
a short and intensive signal when a small coil is
used. Coins and nails and very small pieces of metal
will cause two indications when passing them with
a frame mounted search coil (1 m x 1 m) for exam-
ple. This is mainly because those small objects are
out of the range of the large coils and therefore will
only be indicated at the edges of the frame coils
and only when they are very close to it. Large metal
objects will give an extensive signal with a longer
duration, and therefore can easily be identied.
Deeply buried metal objects will generate a weak
and slowly increasing audio sound and intensity
meter reading. Objects which are close to the surfa-
ce generate a strong and rapidly increasing signal.
Large objects will cause a signal with a long duration
especially when located with large frame mounted
cable coils. For example, a metal box 20cm x 20cm
can give a signal of up to 6m in length when pas-
sing with a (2m x 2m) coil for example. It is therefore
necessary to nd the center of a buried object by the
way of the audio and INTENSITY bar graph. This is
achieved by moving the coil from dierent directions
slowly towards the strongest indication. In many ca-
ses it is of great help to use an additional smaller coil
when pinpointing a metal. The centre of the search
coil is always the most sensitive part. When having
found the place with the strongest indication the
time delay indication will come on with a number
when the signal intensity is sucient.
A specially developed electronic circuit makes time
delay readings possible which are directly displayed
on a scale of 000 to 099. Those so called conducti-
vity readings are only known from VLF TR machines
but not from metal detectors based on the Pulse-
GBS principle. In general, these readings are based
on objects size, conductivity and permeability of
the metal and therefore named time delay readings
for simplicity. When double D coils are in use an ad-
ditional FE ferrous / NON-FE non-ferrous indication
will appear on the LC Display. Therefore, the DEEP-
MAX Z2 has to be ground balanced rst as shown in
the chapter 3 to avoid false indications produced by
the ground. Larger ferrous metal pieces will also be
indicated as being non-ferrous.
7. IDENTIFYING METAL OBJECTS
small object at the surface large object buried deep medium size object

17
Ground signals which are mainly derived from
magnetic iron oxides will be indicated with an in-
creasing audio response when lowering the search
coil to the ground although no metal is below the
search coil. This kind of ground indication can be
simply eliminated by simultaneously holding the
search coil at constant height over the ground and
pressing the ZERO push button for a second. As
long as the coil is hold at the same height during
searching there will be no loss in sensitivity. When
expecting highly mineralized ground with false
indications in the DEL= DELAY modes however it is
always advisable to work with the built- in Ground
Balancing System (GBS) with the GROUND = GND
function turned on. Dierent GND functions can
be selected in order to cancel out signals from
magnetic soils or single stones with high iron oxide
contents. Even some iron objects can be discrimina-
ted/ eliminated by the way of the same functions.
The Sensitivity to ferrous metal objects is greatly
reduced in GND 1-5 modes.
For automatic ground balancing tuning purposes
please go on as follows: Hold the search coil hori-
zontally about 1 m to 2 m over the ground where
there is no metal. Press the ZERO control for several
seconds and wait until the rst tuning process is
nished in the air. Lower the coil to the ground or
single magnetic stone and press the same ZERO
control again for several seconds while keeping
the coil close to the ground. When pressing the
ZERO control the arrow on the display points up
and down in order to indicate the tuning process.
High and low beep sounds will also appear. Du-
ring that time no movements of the coil should be
done. Afterwards the detector is ready for use and
there should be no or only weak indications of the
ground when changing the distance between the
coil and the soil in GND 1-6. During operation it
might be necessary to retune the ground settings
from time to time.
8. AUTOMATIC GROUND BALANCING GND

18
The LORENZ DEEPMAX Z2 should now be almost
silent even if the coil is raised in the air or lowered
to the ground again. If still indications occur it may
be possible that the Detector has been tuned to
a piece of metal in the ground. In this case simply
repeat the same procedure at a metal free place. In
some cases it might be necessary to keep a small
distance between the coil and the ground when
pressing ZERO for the second time in the automatic
two step ground balancing procedure.
In selected GND 3 or GND 5 modes the Detector
will distinguish automatically between the two
signals and will select the stronger signal of two
GND modes. In most cases however the GND 2 or 4
function will be sucient. It is only necessary to run
through the whole tuning process when changing
the coil or turning o and on again the Z2. When
Double D coils are in use, the GND 6 function will
be also selectable but works dierently compared
to the previous explained. The detection depth to
many non- ferrous metal objects will increase when
GND 6 is in use with that coil. In some cases howe-
ver higher iron oxide contents of the ground makes
the Z2 unstable in GND 6 position and therefore
should not be used.
In the case that very high mineralization is expected
GND 1 will be a good choice with some expense of
sensitivity to small metal objects.
With turned on GND function the LORENZ DEEP-
MAX Z2 works with either reduced or higher
sensitivity compared to DEL Delay modes. Some
iron objects and very few non-ferrous metals with
a similar signal response as iron will be indicated
less sensitive. It is even possible to eliminate large
or small iron objects when selecting a special GND
setting. Signals will still occur when the distance
between the coil and the metal is too small because
of signal overload. However most metal objects will
be detected with almost the same or even higher
sensitivity as without ground balancing modes.
An increase in interferences with turned on GND
function due to power lines and radio transmitters
will be realized. The amount of interference could
only be reduced by the way of changing to smaller
or dierential coils, setting the FREQ Frequency
control to a dierent position, reducing the AUDIO
threshold to -1, -2… or adding a higher FILTER set-
ting with some expense of response speed.
When a GND function is active, it is possible to alter
the GND settings manually by pressing the MENU/
GADJ = GROUND ADJUST push button for a longer
duration. As long as G1 and G2 icons are active in
the display simply alter the settings with the upper
or lower push button in single or tenner steps while
pressing the same buttons for a longer duration
(ZERO and OFF). Please note that only GND 1,2,4
and 6 can be altered! To leave the same function
simply press the same MENU/ GADJ button shortly.

19
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

20
Some smaller pieces of bronze may be indicated
with a time delay reading between 50 and 60 na-
mely the same as some ferrous metal objects. At the
same time the LORENZ DEEPMAX Z2 does not suer
from anomalous eects like VLF-TR sine wave detec-
tors do. Therefore very big ferrous metal objects will
not cause a higher reading than 60 in most cases. If
ferrous and non-ferrous metal objects are simulta-
neously located by the search coil the metal classi-
cation circuitry will display the conductivity of the
bigger metal object on the screen. The reading may
also lie between the two dierent kinds of metals.
The time delay/ conductivity metal classication of
the LORENZ DEEPMAX Z2 will work with all availa-
ble coils. It is often helpful to start with “in- air” tests
in order to see how the detector responds to die-
rent metals. Highly mineralized soils, electromagne-
tic interference from power lines or transmitters can
cause inaccurate conductivity meter readings.
Some nails or longer ferrous objects produce die-
rent signals like for example 50-60 at the edges and
35 in the middle, when passing them with the coil.
Note: When expecting mineralized soils it is neces-
sary to tune the detector to the ground rst with the
two step ground balancing procedure. The FE/ NON
FE, Ferrous / Non- ferrous metal identication is of
great help when classifying smaller objects in weakly
or medium mineralized soils with DD- coils. With ma-
gnetic ground however this indication is less accura-
te. The coil has to be hold at a constant height a few
centimetres over the ground while moving slowly in
order to make an indication possible (Motion prin-
ciple). Very big Ferrous metal object like horseshoes
ore bigger will cause a NON FE indication.