Fervi MD01 User manual

OPERATION AND
MAINTENANCE MANUAL
Metal detector
Art. MD01
TRANSLATION OF THE ORIGINAL INSTRUCTIONS
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FOREWORD
Read this manual before operating any machinery
ORIGINAL INSTRUCTIONS
Before starting any operation it is compulsory to read this instruction manual. The guarantee
of smooth operation and full performance of the instrument is highly dependent on the
application of all the instructions contained in this manual.
Operator Qualification
The workers responsible for using this device must have all the necessary information,
education and receive adequate training regarding safety, including:
a) The conditions of use of the equipment;
b) Foreseeable abnormal situations, pursuant to Article 73 of Legislative Decree
81/08.
We guarantee the instrument complies with the specifications and technical
instructions described in the Manual on the date of its issuance (shown in this page).
On the other hand, the instrument may also be subject to important technical changes
in the future, without the manual being updated.
Therefore, see FERVI for information about modifications that could be implemented.
REV. 1
March 2014
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CONTENTS
1INTRODUCTION ........................................................................................ 4
1.1 General safety information ...........................................................................................4
2DESCRIPTION AND CHARACTERISTICS.................................................... 5
3TECHNICAL SPECIFICATIONS ................................................................... 7
4ASSEMBLY................................................................................................. 7
4.1 Installing the battery ....................................................................................................8
4.2 Using headphones.........................................................................................................8
5HOW TO USE ............................................................................................. 9
5.1 Switching on the instrument .........................................................................................9
5.2 Resetting the instrument ..............................................................................................9
5.3 Testing and use of the instrument ................................................................................9
5.3.1 Testing inside buildings...............................................................................................9
5.3.2 Testing and outdoor use ........................................................................................... 10
5.4 Operating tips .............................................................................................................10
6TUNING OF THE INSTRUMENT ................................................................ 11
6.1 False positives ............................................................................................................12
7LOCATING THE OBJECT ........................................................................... 13
8FREQUENT PROBLEMS............................................................................. 14
9CARE AND MAINTENANCE ....................................................................... 14
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1INTRODUCTION
Using this metal detector, it is possible to hunt for coins, relics and jewellery made of ferrous
and non-ferrous metals. The use of this instrument is suitable for any type of person and
requires no special skills or qualifications. The instrument is very versatile and easy to use.
1.1 General safety information
Protect the instrument from bumps or falls. Use extreme caution when handling the
instrument.
Protect the instrument from extreme temperatures and dust. Store the instrument in a
clean, dry place.
When the instrument is not being used for a long period of time it is necessary to
remove the batteries to prevent damage from the leakage of corrosive substances.
Use the device only for the purpose for which it was designed.
Always observe local regulations in force.
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2DESCRIPTION AND CHARACTERISTICS
Figure 1 - Overview of the device
1
Armrest
4
Locking ring
2
Handle
5
Search coil
3
Control unit
1
2
3
4
5
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Figure 2 - Control unit
A
Analogue instrument
F
Battery compartment cover
B
Discriminator adjustment knob
G
Battery compartment
C
Auto tune button
H
Coil connection socket
D
Volume adjustment knob
I
Headphone jack
E
Power light
Headphone jack: allows a pair of headphones (not included) to be connected to the
device in order to hear the acoustic signals in private without disturbing others.
Analogue instrument and two-colour LED: displays the probable type of metal found.
Waterproof search coil: allows the instrument to be used even with the coil placed
underwater.
Extendible stem: this allows the length of the instrument to be changed for more
comfortable use.
Power supply: the instrument is powered by a single 9-volt alkaline battery
A
B
C
D
E
F
G
H
I
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3TECHNICAL SPECIFICATIONS
Description
MD 01
Coil diameter
170 mm
Jack connector
¼”
Maximum detection distance
15 cm for one coin of Ø 25 mm
Battery
1 x 9V
Weight
1.7 kg
4ASSEMBLY
Assembling the metal detector is an easy task and does not require the use of any tools:
1. Loosen the knob on the search coil and remove the screw. Insert the bottom of the
stem of the instrument and tighten the screw, so that the holes on the coil line up with
the through hole on the stem.
2. Loosen the locking ring and insert the lower stem (black) into the upper stem
(aluminium). After inserting the stem adjust the length to the desired point which is
most comfortable for the user.
Figure 3 –Locking ring
3. Insert the locking screw of the control unit inside the
stem and secure it by tightening the screw using the
knob. Then connect the cable from the search coil to
the control unit by inserting it into the appropriate
socket. Wrap the cable around the stem of the
instrument to prevent it from becoming accidentally
damaged. Do not wrap it too tightly to allow the
lengthening or shortening of the stem.
Figure 4 –Assembling the control unit
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Precautions for use
The connecting cable only connects to the socket in one direction. Do not force the
connection.
Do not disassemble the stem length block.
4.1 Installing the battery
1. If the metal detector is turned on, turn the volume knob anti-clockwise until it clicks to
turn off the instrument.
2. Press the battery cover and slide it in the direction of the arrow.
3. Insert a 9V battery into the housing, making sure to respect the polarity.
4. Replace the cover.
Precautions for the battery
Always remove old or weak batteries, which can leak and damage the electronic parts.
If the metal detector is not going to be used for more than a week, remove the
batteries from the compartment.
Do not throw away dead batteries!
When the power LED light starts blinking, the batteries will need to be replaced.
4.2 Using headphones
The user can connect a pair of stereo headphones (not included) to the instrument to listen to
the signals privately. Using headphones also increases battery life and makes it easier to
recognise small changes in the sounds produced for a more accurate search.
To connect the headphones, plug them into the 6.3 mm jack located on the rear of the
control unit.
When the headphones are connected, the instrument speakers are automatically
disconnected.
To protect your hearing, follow this procedure if you intend to connect the headphones
to the instrument:
oSet the volume to the lowest level possible before putting on headphones. Then
turn up the volume to a comfortable level.
oDo not listen to the sounds produced by the instrument at very high volume
levels. Long periods of listening at a high volume may lead to permanent hearing
loss.
oDo not use the headphones in traffic areas or in the presence of motor vehicles.
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5HOW TO USE
This type of metal detector is able to distinguish between ferrous (containing iron) and non-
ferrous metals (gold, silver, copper, platinum, aluminium, lead).
5.1 Switching on the instrument
To turn on the instrument, hold it in a comfortable position, then turn the volume knob
clockwise from the OFF position to the desired volume. As soon as you start to turn the knob
the power light will turn on.
5.2 Resetting the instrument
1. Rotate the volume knob to an intermediate position
2. Rotate the discriminator knob to an intermediate position
3. Keep the search coil at a distance of at least 50 cm above the ground away from
metal parts, press the AUTO TUNE button and hold it down until the needle is pointing
at zero.
It will now be possible to re-press the AUTO TUNE button at any time while taking
measurements to return the needle back to zero.
5.3 Testing and use of the instrument
To learn how to use the instrument and see how it reacts to different metals, the instrument
should be tested before use. The function tests can be done both outdoors and indoors in
buildings.
5.3.1 Testing inside buildings.
1. Remove any metal objects such as rings, watches, bracelets or any other metal objects
that you are wearing.
2. Position the metal detector on a table made of wood or plastic and rotate the search
coil so that it is pointing at the ceiling of the room.
Testing the metal detector
Never test the metal detector on a floor inside a building. Most buildings contain metal parts
in the floors, which can interfere with the objects you wish to test the metal detector with,
making reading unreliable.
3. Reset the instrument as described previously.
4. Move a sample of the element that you wish to find with the metal detector (such as a
gold coin) at a distance of approximately 50 mm from the coil.
Testing the metal detector
When using objects to test the operation of the metal detector, the instrument will capture the
signal more easily if the object is positioned with its largest area parallel to the coil.
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If the metal detector detects ferrous material, it will emit a warning sound, the needle will
move to the left and the analogue display will light up red.
If the metal detector detects non-ferrous material, it will emit a warning sound, the needle
will move to the left and the analogue display will light up blue.
Generally the closer the coil is to the object detected, the further the needle will move
towards the left or right extreme of the scale.
If the metal detector does not detect the object, check the battery is working properly and
make sure the coil is properly connected to the control unit.
5.3.2 Testing and outdoor use
1. Find an area of land outside where there are no metals.
2. Place an object of the same type of material that you want to find in the ground. Mark
the position where the object is placed to prevent losing sight of it, if it is placed in tall
grass or not easily visible.
3. Turn the volume of the instrument up to 2/3 of its maximum power.
4. Carried out the resetting of the instrument.
5. Keeping the search coil parallel to the ground at a
distance of about 25 - 50 mm, slowly move it with
lateral displacements over the area where the test
object is positioned.
6. If you want to look for other metallic materials in
an area where an object has already been
identified, it will be necessary to re-press the AUTO
TUNE button to make the needle return to the 0
position. Figure 5 –Movements with the metal detector .
5.4 Operating tips
Do not use the instrument as if it were a pendulum. Lifting
and not keeping the search coil perfectly parallel to the
ground could lead to incorrect readings.
Move the instrument slowly. Hurried use could lead to objects
being missed which are otherwise detectable.
Keep the coil as close as possible to the ground. The higher
the coil is held over the ground, the more difficult it will be to
detect small objects.
There may be situations in which the instrument can emit
false signals. These can be caused by electrical interference,
large pieces of irregular metals or loose soil.
Figure 6 –Using the metal detector
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6TUNING OF THE INSTRUMENT
After the user has become familiar with the operation of the instrument, tune it to make it
more selective with the identification of various types of objects.
Discrimination is the ability of the instrument to differentiate between various types of
metals. The settings for the DISCRIMINATION function determine whether the instrument
differentiates between ferrous and non-ferrous metals.
This function can be set from the minimum (DISC knob rotated fully anti-clockwise) to the
maximum (DISC knob rotated fully clockwise) or any intermediate position.
It is recommended to use the instrument with the discriminator set to the 3rd point
from the left in clockwise rotation, in such way both gold and tin are seen as non
ferrous materials. In case of further rotation of the discrimination dial these
materials will pass on red.
Turning the dial clockwise from the minimum setting the metal detector will discriminate the
non ferrous metals following the table below.
MATERIALS INDIPENDENT FROM THE DISCRIMINATOR
FERROUS MATERIALS
NON FERROUS MATERIALS
RED
BLUE
Cast iron
Copper
Steel
Alluminium
Iron
Silver
Bronze
NON FERROUS MATERIALS THAT DEPENDS ON THE DISCRIMINATOR
RED
Gold
Tin
BLUE
MAX Clockwise rotation of the discrimination dial. MIN
The metals that depend on the discriminator will be discriminated as you turn the dial in a
clockwise direction. These materials will change from the blue visualization to the red
visualization as the dial is rotated in a clockwise direction.
When a metal under discrimination is found, the needle will move towards the left and the red
LED will light up.
When a non-discriminated metal is detected, the needle will move towards the right and the
blue LED will light up.
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Large pieces
In case of finding large dimensions metal pieces the instrument cannot correctly discriminate
the material and therefore also in the case of ferrous materials the needle of the instrument
will move on the right side and the panel will glow blue.
Discrimination settings
Each time the search area is changed the resetting must be carried out again and the
discrimination value will be reset as the change of area can change the sensitivity of the
instrument.
6.1 False positives
Due to the extreme sensitivity of the metal detector, small pieces of debris or other
interferences may confuse the signal. The key to correctly read the information and give
importance only to very strong, stable and repeatable signals. During the movement of the
coil back and forth in the same position, learn to distinguish the signals that occur randomly
from those that are stable and repeatable.
To minimise this problem in areas with a lot of interference, examine only small pieces of land
at a time, making short movements and rechecking the same spot several times.
Unexploded ordnance
If the metal detector finds an unexploded bomb, do not try to move it or defuse it. Move away
from the location immediately and contact the local authorities. Prevent other people from
approach the area by warning them of the danger.
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7LOCATING THE OBJECT
Correctly and precisely locating an object makes the subsequent digging work much easier
and shorter. Do not rush to dig at any detection made by instrument.
Accurate localisation requires practice by the user. It is recommended to practice detecting
personal objects previously hidden to understand the various nuances of detection of the
instrument.
Some objects will be difficult to locate because of the direction of the search movements. Try
changing the search direction to improve the outcome.
Follow these steps to accurately locate an object:
1. When the metal detector detects a buried object,
continue to move the coil back and forth over the object.
Take a visual note of the position where is the strongest
signal is given.
2. Stop the coil exactly over the marked spot and move it
slowly back and forth with (away and toward you) to
verify that the marked point is where the emitted signal
is strongest.
3. Carry out movements to X over the presumed position of
the object and check that the centre of the movement
corresponds with the increased noise from the
instrument. Figure 7 –Localisation
Oxidation
Metal objects buried for a long time are most likely oxidised. The oxidation of metals creates a
halo around the detected object. Precise detection is therefore more difficult because the
metal detector also detects the halo of oxidation.
Unexploded ordnance
If the metal detector finds an unexploded bomb, do not try to move it or defuse it. Move away
from the location immediately and contact the local authorities. Prevent other people from
approach the area by warning them of the danger.
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8FREQUENT PROBLEMS
PROBLEM
CAUSE
SOLUTION
The metal detector
finds false positives
The coil is being moved too
quickly or at the wrong angle.
Move the coil more slowly and
parallel to the ground.
The metal detector might have
encountered a highly oxidised
object.
Try to locate the object by moving
the instrument in various
directions. If the instrument
reading changes every time
depending on the direction of
sampling, the object is most likely
very oxidized metal.
The metal detector
does not display the
correct type of metal
when it detects an
object
There might be more than one metal object in the area that you are
sweeping.
The object may be a type of metal that the instrument does not
recognise.
If the object is very oxidised the instrument may not report the
correct type of metal.
9CARE AND MAINTENANCE
Keep the metal detector dry. If the instrument gets wet, dry it immediately
with a soft cloth. Liquids might contain minerals that could corrode electronic
circuits.
Use and store the metal detector in environments with a normal
temperature
(+5°C ÷ +40°C). Extreme temperatures can shorten the life of electronic
devices, damage batteries, and deform or melt plastic parts.
Keep the instrument away from dirt and dust that can cause premature wear
of parts and components.
Handle the metal detector with care. Dropping the device may damage the
internal circuits and the structure causing malfunctions.
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