Vallon VMH3CS Operation Manual

Vallon GmbH • Arbachtalstr. 10 •72800 Eningen • Germany

Phone: +49-7121-98550 • Fax: +49-7121-9855-100 •

info@vallon.de • www.vallon.de

Searching with Excellence

METAL DETECTOR

VMH3CS

Software Version 1.14_click

OPERATION MANUAL

Issue 07/2007

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Metal Detector VMH3CS – Operation Manual

Notes concerning the Electromagnetic Compatibility (CE)

This detector corresponds to class B according to EC-guideline 89/336/EWG.

If the detector is used in accordance with the regulations, changes of the electromagnetic surroundings are measured and indicated.

Therefore, the detector cannot suppress all noise frequencies. In worst case other electronic instruments may release false alarms due to their radiated emissions.

A further functional disorder – not recognizable by the operator – does not occur.

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Metal Detector VMH3CS – Operation Manual

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Metal Detector VMH3CS – Operation Manual

CONTENTS

1. GENERAL APPLICATION.................................................................................. 5

2. DESIGN FEATURES .......................................................................................... 7

2.1 Detector Electronics................................................................................................................. 9

2.2 Search Head with Telescopic Pole.......................................................................................11

2.3 Headset with textile ribbon (optional accessory) ............................................................... 12

3. OPERATION..................................................................................................... 13

3.1 Individual Alarm Configurations........................................................................................... 15

3.2 Switching ON and OFF and Program Settings.................................................................... 16

3.2.1 Confidence Click............................................................................................................. 16

3.3 Fine Adaptation to Mineralized Soil...................................................................................... 17

3.3.1 Automatic Fine Adaptation to Mineralized Soil............................................................... 17

3.3.2 Manual Fine Adaptation to Mineralized Soil................................................................... 18

3.3.3 Important Notes.............................................................................................................. 19

3.4 Setting the Detection Sensitivity .......................................................................................... 20

3.5 Operational Readiness, Sensitivity Test Piece ................................................................... 21

3.6 Checking the Battery Capacity Level................................................................................... 22

4. AUDIO ALARM SIGNALS DURING OPERATION........................................... 23

4.1 Full Battery Charge Signal (Simulation)............................................................................... 23

4.2 Battery Charge Signal with 50 % of Capacity (Simulation)................................................ 23

4.3 Low Battery Charge Signal (Simulation).............................................................................. 24

4.4 Detector "Non Functioning" Signal (Simulation)................................................................ 24

4.5 Typical Target Detection Signals.......................................................................................... 25

5. VISUAL SIGNALS ............................................................................................ 28

5.1 Visual Signals during Detection ........................................................................................... 28

5.2 Visual Error Messages, Cause and Remedy ....................................................................... 30

6. VIBRATION SIGNALS DURING THE DETECTION WORK............................. 31

7. PRACTICAL DETECTION WORK.................................................................... 32

7.1 Pinpointing.............................................................................................................................. 32

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Metal Detector VMH3CS – Operation Manual

7.2 Detection in Non-Overgrown Areas with the Oval Search Head....................................... 33

7.3 Detection in Overgrown Areas with the Oval Search Head ............................................... 33

7.4 Detection in Waters................................................................................................................ 34

8. Simultaneous operation of two DETECTORS in close vicinity ................... 35

9. DATA input / DATA OUTPUT.......................................................................... 36

9.1 Computer aided UXO detection............................................................................................ 36

9.2 Firmware Upgrade.................................................................................................................. 36

APPENDIX A – LIST OF AUDIO SIGNALS 37 APPENDIX B – SHORT INSTRUCTIONS 38 APPENDIX C – TECHNICAL DATA 40 APPENDIX D – DIMENSIONAL DRAWINGS 42 APPENDIX E – SPARE PARTS 43 APPENDIX F – UXO SEARCH HEAD (OPTIONAL ACCESSORY) 47 APPENDIX G – STICK PROBE (OPTIONAL ACCESSORY) 55

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Metal Detector VMH3CS – Operation Manual

1. GENERAL APPLICATION

The use of the Metal Detector in accordance with the regulations is the detection of metal parts in mines or in ammunition or explosive ordnance in the ground and in shallow water. The search head must be moved above the ground in such a way that obstacles like grass, stones, branches or explosive ordnances are not touched.

ATTENTION: Danger of Explosion.

Do not use the metal detector for scanning persons.

The Metal Detector is consisting of two parts: control unit with telescopic pole and a pluggable oval search head. As an optional accessory a large UXO search head or a stick probe can be connected.

The oval search head is recommended for the detection of metal mines and plastic mines with minimum metal content as well as other small metal parts.

The large UXO search head is recommended for the detection of shells, bombs and other ammunition in larger depths.

The stick probe is recommended for detection even in hollow spaces, bushes and trusses of hay.

The detector has been designed for the highly accurate detection of all types of ferrous and non-ferrous metals. Ease of operation and a rigid and compact mechanical design ensure very reliable operation for professional ordnance clearing in battlefield operations and rigorous military training programs.

Along with its digital signal processor the metal detector uses the function principle of an advanced pulse-field specially improved by Vallon. It can work also in strongly mineralized soils, like laterite, magnetite, magmatite as well as in shallow water (salt and fresh water) and under the electromagnetic influence of main power lines without affecting the detector’s sensitivity too much.

The metal detector ready for service, including accessories, is delivered in a rigid carrying bag.

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Metal Detector VMH3CS – Operation Manual

WARNING

The Metal Detector detects metals only. Each audio signal may indicate a mine with metal content or an UXO. Mines containing only small metal parts with very special metallic alloy may eventually not be detected. Mines without any metal part will not be detected.

Before starting detection work make the performance test as described in chapter 3.5.

WARNING

DO NOT USE THE METAL DETECTOR FOR LOCATING MAGNETICALLY INFLUENCED MUNITIONS.

Some of the known mines of NATO-countries will not be activated, provided the detector is equipped with non-magnetic batteries. For detection of mines of other manufacturers it is recommended to test in advance whether they are detectable before the operator starts the detection work.

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Metal Detector VMH3CS – Operation Manual

2. DESIGN FEATURES

The Metal Detector VMH3CS, packed ready for service, consists of the following main components:

(1) Detector electronics with integrated arm-rest, battery compartment,

ON/OFF switch for two different ground conditions, non-magnetic loudspeaker and vibrator. Integrated two-piece telescopic carrying bar with plug-in connection for search head

Hand grip with LED-bargraph (14 elements), 4 rigid push buttons for sensitivity control, volume control, ground compensation and pinpoint function

(2) Carrying bar with watertight oval search head and plug-in connection to

the control unit

(3) Test piece (non-magnetic)

(4) 3 EA batteries (single-cell batteries IEC R 20 à 1,5 V)

(5) Operation manual

(6) Field manual

(7) Field backpack

Fig. 2-1 Field Backpack

7

6

5

4

1

3

2

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Metal Detector VMH3CS – Operation Manual

Optional Accessories: (available on request)

(8) Non-magnetic, watertight headset

(please refer to chapter 2.3)

(9) Rechargeable batteries, 3 ea (D-size), (not shown)

(10) Multisource charging set (not shown)

(11) Hard case

(12) UXO search head with carrying bag

(13) Stick Probe

Fig. 2-2 Optional Accessories

12

13

11

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Metal Detector VMH3CS – Operation Manual

2.1 Detector Electronics

1 2 3 4

5 6 7 8

Fig. 2-3 Detector Electronics

(1) Hand grip (6) Mode selector (2) Indication and operation elements (7) Battery compartment

(3) Loudspeaker (8) Lock of

(4) Arm-rest battery compartment

(5) Connector

The detector electronics (Fig. 2-3) contains a battery compartment (Fig. 2-3/7) for 3 batteries (alkaline mono cells, or Ni-MH-accumulators), which can be replaced easily.

The distance between arm-rest (Fig. 2-3/4) and hand grip (Fig. 2-3/1) can continuously be adjusted according to the operator’s height.

The detector is switched ON and OFF by means of the mode selector (Fig. 23/6) on the front panel. For optimal detection two different soil programs can be selected.

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Metal Detector VMH3CS – Operation Manual

In addition there is arranged a connector on the front of the metal detector (Fig. 2-3/5) which is normally closed by a protection cap. This connector has three functions:

a) Connecting a headset

b) Data input for upgrading the firmware of the metal detector by means of a

Personal Computer and a serial port interface.

c) Data output for computer-aided detection.

The hand grip (Fig. 2-3/1) is also used as operation element and is permanently fixed to the detectors electronics unit.

Fig. 2-4 Operation elements in the hand-grip

LED Display – 14 LEDs

for metal alarm, battery check, sensitivity setting

reducing

sensitivity or

volume of

audio signal

increasing

sensitivity or

volume of

audio signal

fast compensation (in program „normal“ and „mineral“)

SOIL compensation (in program „mineral“)

PINPOINT

button

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Metal Detector VMH3CS – Operation Manual

2

1

3

4

6

5

7

2.2 Search Head with Telescopic Pole

The non-magnetic search heads (oval and UXO) are watertight, insensitive to

temperature changes, and shock-proof. The shape of the coil frame ensures a free view to the ground. The search heads can be swiveled round the pole. The end of this pole is provided with a watertight, rigid plug for connecting to the telescopic pole which is firmly connected to the detector electronic.

Pole and telescopic pole are made from very rigid, short column and corrosion-free glass fibre reinforced plastic.

The parts of the telescopic pole are provided with a guide rail. The design features prevent any twisting of the telescopic pole during sweeping operations. That means the position of the search head remains constant in relation to the hand grip.

The connection cable for the search head to the electronics unit runs completely inside the telescopic pole so that it cannot be damaged. The correct connection between search head and control unit is monitored by the electronics.

(1) battery compartment

(2) adjustable arm-rest

(3) control unit with hand grip

(4) connector and mode selector

(5) telescopic pole,

protected against twisting

(6) plug-in connection

(7) pluggable search head, oval

Fig. 2-5 - Search Head with Telescopic Pole

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Metal Detector VMH3CS – Operation Manual

2.3 Headset with textile ribbon (optional accessory)

The headset contains a non-magnetic piezo-

speaker. It can be used as a headphone by wearing it over the ear. The soft design assures that it can be worn under a protection helmet.

If the headset is connected, the loudspeaker is switched off automatically.

Fig. 2-6 - Headset used as headphone

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Metal Detector VMH3CS – Operation Manual

3. OPERATION

1. Remove the detector electronic from the field backpack.

2. Plug-in the oval search head in the desired position and screw on tightly.

Fig. 3.1 Detection work in kneeling or proning position.

Fig. 3.2 Detection work in stand-up position.

3. Insert the batteries.

4. Tilt the search head to the desired angle.

5. Adjust the length of the telescopic pole.

6. Switch ON and search.

Proning

Kneeling

Fig. 3-1 Position for detection work in proning or kneeling

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Metal Detector VMH3CS – Operation Manual

Fig. 3-2 Position in standing

NOTE:

It is not necessary to open the thread completely. Two turns are sufficient.

Fig. 3-3 Adjusting the Length of the Telescopic Pole

max. 2 turns

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Metal Detector VMH3CS – Operation Manual

3.1 Individual Alarm Configurations

You can select different alarm modes by pressing one or a combination of two

or three buttons + / C / – on the control panel.

Procedure: 1. Press the desired combination of buttons and keep them

pressed. Switch ON the detector by setting the desired operation mode “normal” or “mineral”.

2. Keep the buttons pressed during the battery check signal (min. 3 seconds).

The functions of the buttons are:

The following alarm modes are possible:

–

vibration only (silent mode)

C

audio alarm only

+

LED display only

and

– and C

vibration and audio alarm

and

– and +

vibration alarm and LED display

and

+ and C

LED display and audio alarm

and and

– and C and +

vibration and audio alarm and LED display (standard mode)

The selected alarm mode is stored by the detector and is kept even if the

detector is switched OFF or during the replacement of batteries. If no button is pressed while switching ON the detector, it will start in the previously selected mode.

audio alarm ON LED display ON

vibration alarm ON

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Metal Detector VMH3CS – Operation Manual

3.2 Switching ON and OFF and Program Settings

The mode selector serves as ON-OFF-switch as well.

The metal detector is in use world-wide. In order to ensure that it operates fast and accurately also in areas with a high mineral content, for example magnetite stones, laterite or bauxite soil, some special detection features are available.

Fig. 3-4 mode selector

off: Detector is switched OFF normal: Detector is switched ON.

Detection in normal soil (non-magnetic, not mineralized) No further settings are necessary. mineral: Detector is switched ON.

Detection in mineralized soil respectively soil with some mineral

content stones

For fine adaptation to the soil see section 3.3.

Detector is switched ON.

Setting the volume of the audio signal with buttons „+“ and „-“.

3.2.1 Confidence Click

In addition to the standard audio signals, a “confidence click” is audible during the operation of the detector in the program for normal (N) or mineralized (M) soil. In normal soil, the confidence click is a single short pulse, every 2 seconds.

In mineralized soil, the confidence click is a double short pulse signal.

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Metal Detector VMH3CS – Operation Manual

3.3 Fine Adaptation to Mineralized Soil

3.3.1 Automatic Fine Adaptation to Mineralized Soil

For detection work in mineralized soil set the mode selector to position

“mineral”. This activates a standard program for mineralized soils.

The exact soil conditions depending on the respective country (Cambodia or Mozambique or New Mexico, a.s.o.) have to be adjusted by a fine adaptation directly at site.

The achieved data will be stored deliberately until a new fine adaptation is started (even if the detector is switched OFF, if batteries are missing, if keeping on stock, a.s.o.).

Procedure:

1. Set the mode selector to position „mineral”.

2. Put the search head on the ground (please choose an area absolutely free of metal)

3. Press key „C“ in the hand grip and keep it pressed.

4. After 3 seconds while keeping button „C“ pressed a short tone (beep) becomes audible.

The metal concentration of the previous soil is indicated by one of the 14 diodes of the LED display.

Lift up the search head and move it back to the ground. Depending on the mineral concentration several up-and-down-movements are necessary. During these up-and-down-movements a continuously decreasing audio signal is produced, it becomes smaller and smaller.

The lighting diode on the LED-display is now shifted either to the left or to the right according to the mineral concentration of the present soil.

Repeat these up-and-down movements with pressed button „C“ until a continuous tone (beep) is produced. In strongly mineralized soil this procedure may need up to 1 minute.

5. Stop pressing button „C“: You will hear one short tone (beep) which confirms the storage of the achieved data.

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Metal Detector VMH3CS – Operation Manual

Fig. 3-5 SOIL Compensation

3.3.2 Manual Fine Adaptation to Mineralized Soil

In case of difficult ground conditions the detector can be adapted manually to the mineralized soil.

The achieved data will be stored deliberately until a new fine adaptation is started (also if the detector is switched OFF, if batteries are missing, if keeping on stock, a.s.o.).

Procedure:

1. Set the mode selector to position „mineral”.

2. Put the search head on the ground (please choose an area absolutely free of metal)

3. Press button „C“ in the hand grip and keep it pressed.

4. Press button”+” in the hand grip and keep it pressed.

5. After 3 seconds while keeping button „C“ and button “+” pressed a short

tone (beep) becomes audible.

6. While hearing the short tone (beep) stop pressing button “+” but continue to keep button „C“ pressed.

The metal concentration of the previous soil is now indicated by one of the 14 diodes of the LED display.

Lift up the search head and move it back to the ground. While keeping button “C” pressed you can adjust the setting for the mineral concentration by pressing the buttons “+” respectively “-“ until it corresponds to the soil conditions and no more audio signal is produced during these up-anddown-movements.

press „C“

permanently

lift after

3 seconds

after

1 sec.

after

1 sec.

after

1 sec.

after

1 sec.

finished

20-30 cm

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Metal Detector VMH3CS – Operation Manual

The lighting diode on the LED-display is shifted either to the left or to the right according to the mineral concentration of the present soil.

7. Stop pressing button „C“: You will hear one short tone (beep) which confirms the storage of the achieved data.

3.3.3 Important Notes

NOTE

Start soil compensation only after the detector has adapted itself to the ambient temperature. In case of more than 15°C difference in temperature between storeroom and detection place wait for approx. 10 minutes.

NOTE

If the audio signal does not become smaller during the up-and-downmovement of the search, please check whether a metal object has been detected.

NOTE

When pressing, by mistake, button “C” during detection longer than approx. 3 seconds, the ground balance will change to another soil condition. You must repeat the procedure.

NOTE

The program “mineral” adapts the detector to the metallic properties of the

soil. Mines containing metal components with the same electromagnetic features may be overlooked.

Use program „mineral“ only if absolutely necessary.

Recommendation:

Create a test field in the soil to be detected. This field should contain all mines to be expected.

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Metal Detector VMH3CS – Operation Manual

3.4 Setting the Detection Sensitivity

When switched ON the detector starts with its standard sensitivity setting. This standard setting can be changed by pressing the buttons „+“ and „-“ in the hand grip.

The level of the detection sensitivity is symbolically indicated by the length of the LED-bargraph in the hand grip.

The selected sensitivity will be kept constant by the electronics under all environmental conditions (temperature changes, etc.).

If you are operating with the highest detection sensitivity (threshold of the

audio signal) we recommend in case of strong temperature changes (i.e. from cold storage to warm field conditions) to readjust the detection sensitivity as follows:

Temperature Change

Readjust

after

up to 20°C 5 min.

40°C or more 10 min.

The selected sensitivity is kept constant during the operation until the detector is switched OFF. After each switching ON you have to select the desired detection sensitivity again.

NOTE

For safety reasons the detector always starts with its basic sensitivity setting,

that means with high detection sensitivity.

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Metal Detector VMH3CS – Operation Manual

3.5 Operational Readiness, Sensitivity Test Piece

The proper function of the metal detector can be tested by means of the delivered test piece as follows:

1. Before starting the test procedure, make sure that all alarm modes (three) are active (audio alarm, LED-display, vibration).

2. Select the desired soil program (set the mode selector to position “normal” or „mineral”) and wait until battery check has been finished.

3. Place the metal detector on an area free of metals.

a. No audio signal should be audible b. No LEDs should be illuminated c. No vibration alarm should be perceptible.

4. Move the test piece vertically (string at the top) from the top (starting from the telescopic pole in approx. 0.5 meter distance to the search head) towards the search head until the test piece is positioned on the center of the search head. (The operator’s hand must be free of metal parts; i.e. no watches, no rings, etc.).

Fig. 3-6 Function Test

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Metal Detector VMH3CS – Operation Manual

5. When approaching the test piece to the search head

- the audio signal must increase.

- the vibration alarm must be perceptible.

- more and more illuminating diodes must be activated. Approx. 7 LEDs must be illuminated when touching the center of search head.

6. Remove the test piece from the search head.

7. Turn off the Metal Detector.

Remarks:

For checking the compensation of the metal detector you can place the test piece on the center of the search head.

In program „normal“ the strength of the audio signal is decreasing until it disappears completely.

In program „mineral“ the strength of the audio signal remains unchanged and disappears only after short pressing of button „C“ in the hand grip.

3.6 Checking the Battery Capacity Level

- Set the mode selector from OFF to „normal“ or „mineral“.

 For approx. 5 seconds an interrupted audio signal respectively

vibrations are produced. The "faster" the signal, the fuller the batteries.

Fig. 3-7 Battery check signal

- Switch OFF the detector.

10%

Change batteries.

50%

100%

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Metal Detector VMH3CS – Operation Manual

4. AUDIO ALARM SIGNALS DURING OPERATION

(Training procedures to simulate detector audio signals)

The metal detector provides via the headset/loudspeaker a lot of information

to the operator. This short training chapter will allow the user to become familiar with all of the different alarms and how they are distinctly different from each other.

Of course, an audio alarm signal is produced only if the corresponding alarm

configuration has been selected (please refer to chapter 3.1).

4.1 Full Battery Charge Signal (Simulation)

- Insert 3 new unused batteries into the battery compartment.

- Switch the detector ON.

- For about the first 5 seconds after

the detector is switched ON, a fast pulsed signal is audible.

4.2 Battery Charge Signal with 50 % of Capacity (Simulation)

- Insert 2 new unused batteries and 1 nearly empty battery into the battery

compartment.

- Switch the detector ON.

- For about the first 5 seconds after

the detector is switched ON, a slow pulsed signal is audible. This signal

corresponds to a residual battery capacity of 50 %.

The detection sensitivity remains constant while the battery voltage drops

down.

10 pulses/sec. with approx. 2300 Hz

6 pulses /sec. with approx. 2300 Hz

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Metal Detector VMH3CS – Operation Manual

4.3 Low Battery Charge Signal (Simulation)

- Switch the detector ON.

- Place the search head on the ground.

- Place an extra battery or metal part on the search head.

- A high tone will sound continuously.

This signal w ould be audible if the batteries reach a low level (not

enough capacity for the detector to operate at 100 %). The vibrator produces a continuous signal until the batteries are

completely exhausted.

4.4 Detector "Non Functioning" Signal (Simulation)

- Insert 3 batteries into the battery compartment.

- Disconnect search head

- Switch the detector ON. After 5 sec. a low continuous

signal is audible.

This signal will also be generated if the electronics finds a fault during operation.

The vibrator produces the same signal.

The following parameters can be faulty:

- 6 internal voltages which are responsible for proper operation.

- Connection to the search head.

- Capacity, induction value, and resistance of the coils in the search head.

- Voltage, time, and energy of every pulse.

High continuous signal, approx. 2300 Hz

Low continuous signal, approx. 500 Hz

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Metal Detector VMH3CS – Operation Manual

4.5 Typical Target Detection Signals

Deeply buried, large metal mines and small metal parts near the surface can

be differentiated by an audio alarm signal.

Move the search head with continuous speed above the ground surface.

The maximum detection signal is produced directly above the center of the mine (metal part) and indicated as follows:

a) Maximum volume of the audio signal.

b) LEDs on the display are illuminated (length proportional to the strength

of the audio signal)

c) Vibration in the hand grip.

Fig. 4-1 Detection Signals

strength of audio signal

distance

vibration

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Metal Detector VMH3CS – Operation Manual

Upon detection of medium size metal mines and larger, the signal strength is

strong enough to switch-over the alarm threshold respectively the LEDdisplay.

Now a second audio signal (II) is produced. Alarm signal II indicates that there

is a large amount of metal.

The 14th LED of the optical display flashes and indicates that second detection signal is activated.

Fig. 4-2 Detection Signals

vibration

strength of audio signal

distance

LED-display at audio signal II

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Metal Detector VMH3CS – Operation Manual

Graph A indicates the maximum audio/visual signal upon detection of larger

metal objects.

Graph B indicates the maximum audio/visual signal respectively the vibration signal upon detection of very small metal striker pins in plastic AP mines buried in horizontal position.

Graph A Graph B

Fig. 4-3 - area of maximum audio signal below the search head

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Metal Detector VMH3CS – Operation Manual

5. VISUAL SIGNALS

Provided that you have selected an alarm configuration with LED Display (please refer to chapter 3.1), the LED-display in the hand grip indicates the following conditions.

5.1 Visual Signals during Detection

Position of

Mode Selector

Meaning LED-Display

Increase sensitivity

Press button +

maximum sensitivity adjusted

Reduce sensitivity

Press button –

normal

mineral

Press button –

minimum sensitivity adjusted

Legend:

LED flashes when pressing the button

LED is illuminated

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Metal Detector VMH3CS – Operation Manual

Position of

Mode Selector

Meaning LED-Display

Reduce volume of audio signal

Press button -

Increase volume of audio signal

Press button +

normal

mineral

Fast compensation

Press button C

mineral

Starting soil compensation (please refer to chapter

3.3)

Legend:

LED flashes when pressing the button

LED is illuminated

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Metal Detector VMH3CS – Operation Manual

5.2 Visual Error Messages, Cause and Remedy

Position of

Mode Selector

Cause and Remedy LED-Display

Batteries do not have enough energy.

→ Insert new batteries.

Defect in the electronics.

→ Return detector to the manufacturer or service center for repair.

Broken search head cable.

→ Return detector to the manufacturer or service center for repair.

normal

mineral

Search head cable short circuit.

→ Return detector to the manufacturer or service center for repair.

Legend:

LED flashes when pressing the button

LED is illuminated

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6. VIBRATION SIGNALS DURING THE DETECTION WORK

Provided that you have selected an alarm configuration with vibration (please refer to chapter 3.1), the vibration of the hand grip indicates the following conditions:

Signal

Meaning

2 impulses/second

Vibration after switching ON for

about 5 seconds.

Batteries are full.

Metal detector is ready for operation.

1 impulse/second

Vibration after switching ON for

about 5 seconds:

Batteries have 50 % of the energy;

Metal detector is ready for operation.

1 impulse/2 seconds

Vibration after switching ON for

about 5 seconds:

Batteries have 10 % of the energy;

Metal detector is ready for operation.

continuous vibration

Continuous vibration.

Batteries do not have enough energy.  Insert new batteries.

Defect in search head, cable or electronics. → Return the metal detector to the manufacturer or service center for repair.

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7. PRACTICAL DETECTION WORK

Each spot of the search head has nearly the same detection sensitivity.

However, the maximum detection signal will be produced if the detected metal object is located directly in the centre of the search head.

The metal detector uses a dynamic function principle to avoid false alarms and to ensure an optimal soil adjustment. That means the search head must always be moved in order to ensure the maximum sensitivity. The movements can be made sideways or forwards and backwards depending on the terrain.

If you have detected a metal object, you can determine its exact position by searching the maximum detection signal when moving the search head sideways and forwards/backwards. The metal objects is located at the cross over point of both movements

7.1 Pinpointing

To facilitate the pinpointing procedure the Metal Detector is provided with a PINPOINT-button. When pressing the PINPOINT-button the dynamic mode is switched OFF. That means the detection signal is no longer compensated and you can search the centre of the object with extremely slow movements of the search head and without any loss of detection sensitivity.

If you stop pressing the PINPOINT-button the metal detectors continues in its standard dynamic mode.

NOTE: After you have detected the exact position of the metal

object, lift off the search head from the metal object and then stop pressing the PINPOINT-button.

NOTE: During pinpointing the soil compensation of the metal

detector is not automatically readjusted. Therefore, use the pinpointing function only if necessary and only for a short time. If you use the pinpointing function for a longer time, a continuous audio signal might be produced. Clear the continuous audio signal by pressing button “C”.

NOTE: Pinpointing is not advantageous in heavily mineralized

and/or very uneven ground.

PINPOINT-

button

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Metal Detector VMH3CS – Operation Manual

7.2 Detection in Non-Overgrown Areas with the Oval Search Head

Detection work is relatively simple in areas free from vegetation as the operator has always free view to the search head. You can move the search head with an extremely small distance to the ground.

7.3 Detection in Overgrown Areas with the Oval Search Head

The detection of mines in an area full of dense vegetation is very dangerous,

difficult and time-consuming. By moving the search head over the ground you may possibly touch a trip wire or the release mechanism of a mine, which is positioned close to the ground surface (e. g. PROM1), and may trigger an explosion.

The trained deminer knows very well the precautionary measures in

overgrown areas, e. g. checking first of all the grass and the branches with the trip wire feeler and cutting the grass and the branches thereafter carefully etc.

You should have free view to the search head at any time. We refer to the well-known SOP’s (standard operation procedures).

NOTE: The SOP’S have absolute priority to any instruction

manual.

NOTE: Move the search head continuously as the detection

system has a dynamic function principle and adapts itself continuously to the soil.

NOTE: In order to determine the exact position of the

detected metal object faster, press the PINPOINTbutton and move the search head slowly above the metal object (the maximum signal is produced when the metal objects is in the centre of the search head).

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Metal Detector VMH3CS – Operation Manual

7.4 Detection in Waters

You can also immerse the search head in flat waters in order to detect metal objects or mines hidden in the ground.

Usually there is a larger difference in temperature between air and water. Therefore, we recommend the following procedure:

1. Immerse the search head in the water

2. Wait for approx. 15 seconds until the search head has adapted itself to the

water temperature

3. Start compensation by pressing button „C“ briefly

4. After the alarm signal has stopped, you can move the search head slowly

above the ground of waters and observe the detection signals.

NOTE: The SOP’S have absolute priority to any instruction

manual.

NOTE: Move the search head continuously as the detection

system has a dynamic function principle and adapts itself continuously to the soil.

NOTE: In order to determine the exact position of the

detected metal object faster, press the PINPOINTbutton and move the search head slowly above the metal object (the maximum signal is produced when the metal objects is in the centre of the search head).

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Metal Detector VMH3CS – Operation Manual

8. SIMULTANEOUS OPERATION OF TWO DETECTORS IN CLOSE VICINITY

If you intend to examine an area with two detectors working close to each, a minimum distance of 2 m is possible provided that the working frequency of the metal detectors has been adjusted correspondingly.

The adjustment of the working frequency is done as follows:

1. Set the program selector to position

2. Press button „C“ in the hand grip and keep it pressed.

As a check a short tone (beep) becomes audible (keep button „C“ pressed) and two LEDs in the display light up.

Adjust the working frequency with buttons „+“ and „-“ (keep button „C“

pressed)

The adjusted working frequency is indicated by the LED-display in the hand grip as follows:

Detector LED-Display in the hand grip

Frequency 1

Detector No. 1

1st and 11th LED visible

Frequency 7

Detector No. 2

7th and 11th LED visible

After having adjusted the desired working frequency let go of button „C“.

3. Set program selector to position „normal“ or „mineral“ and start detection work.

The achieved data will be stored deliberately until new frequencies are chosen (even if the detector is switched OFF, if batteries are missing, if keeping on stock, a.s.o.).

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Metal Detector VMH3CS – Operation Manual

9. DATA INPUT / DATA OUTPUT

9.1 Computer aided UXO detection

(Only reasonable after all mines have been cleared)

The metal detector is provided with a RS 232 data output on the front panel.

The measuring data can be stored by the VALLON data loggers MEMOBOX MB4 or FIELD COMPUTER VFC1 (with external power supply) and evaluated in a PC with Software VALLON EVA2000®.

The acquisition rate is 40 measuring values/sec.

The layout of the connector pins is as follows:

A: RxD RS 232 B: Audio signal for headset

C: +BSW D: Audio signal/GPS E: TxD RS 232 F: GND

Fig. 9-1 – Data input and output RS 232

NOTE: We recommend using a PC with LCD-screen (Laptop).

An active PC-cathode ray screen is causing interferences to the metal

detector. Therefore, keep minimum 5 m (15 feet) distance from the detector during data acquisition!

9.2 Firmware Upgrade

The connector is provided with a RS 232 data input to upgrade the firmware of

the detector.

View from front panel side.

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Metal Detector VMH3CS – Operation Manual

APPENDIX A - LIST OF ACOUSTIC SIGNALS

Signal

Meaning

10 pulses/sec. with approx. 2300 Hz

Signal is audible after switching ON

for about 5 seconds:

Batteries are full;

Metal detector is ready for operation.

6 pulses/sec. with approx. 2300 Hz

Signal is audible after switching ON

for about 5 seconds:

Batteries have 50 % of the energy;

Metal detector is ready for operation.

2 pulses/sec. with approx. 2300 Hz

Signal is audible after switching ON

for about 5 seconds:

Batteries have 10 % of the energy;

Metal detector is ready for operation.

high continuous signal, approx. 2300 Hz

High continuous signal:

Batteries do not have enough energy.

 Insert new batteries.

low continuous signal, approx. 500 Hz

Low continuous signal:

Defect in search head, cable or electronics.

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Metal Detector VMH3CS – Operation Manual

APPENDIX B - SHORT INSTRUCTIONS

 Plug-in the detector search head and screw it tightly.

 Insert batteries into the battery compartment of the electronics unit. Close the

battery compartment.

 Adjust the telescopic pole to the desired length.

 Adjust arm-rest according to your arm length.

 Connect the headset (optional accessory) to the electronics unit.

 Set the mode selector to „normal“ or „mineral“.

 Evaluate the battery signal for the capacity level (continuous signal = replace

batteries immediately; pulsed signal = batteries are usable).

 Wait until automatic battery check is finished (approx. 5 seconds).

 Make a performance test with test piece as described in chapter 3.5.

 Adjust the desired detection sensitivity by pressing the buttons “+” or “-” in the

hand grip.

 Hold search head parallel in a distance of 1 - 3 cm above the ground (free of

metals) and wait until compensation of equipment is finished (signal no longer audible).

 Sweep search head slowly and parallel to the ground. Each audio signal indicates

a metallic object situated below the search head.

 Optimal sweeping speed: 0.3-1 m/sec

 Determine the exact position of the detected metal object: Press PINPOINT-button

and keep it pressed.

 In case of mineralized soils or soils with mineral content stones keep the search

head above the ground and press button “C” in the hand grip for more than 3 seconds. Move the search head up and down and adapt the search head to the mineralized soil (applicable only for program “mineral”).

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Metal Detector VMH3CS – Operation Manual

IMPORTANT NOTES

- Search head must always be moved in the same distance to ground.

- Do not knock search head against stones.

- Do not dig with search head.

- Keep threads and contacts of battery compartment clean.

- Keep connectors clean.

- Do not hang-up headset at cable.

- Remove batteries before storing, replace empty batteries immediately and check whether battery acid is in the battery compartment.

- For safety reasons stop detection work immediately, if damages on electrical parts (search head, cable, plugs etc.) become visible.

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Metal Detector VMH3CS – Operation Manual

APPENDIX C – TECHNICAL DATA

1. Dimensions:

Telescopic pole

- with oval search head: min. length: 920 mm  5 mm

max. length: 1260 mm ± 5 mm

Oval Search head: 308 x 170 mm

Detector electronics: 500 x 100 x 242 mm ± 5 mm

Test piece: Aluminium pin length: 11 mm

diameter: 3 mm sealed in a Plexiglas tube length: 90 mm diameter: 15 mm with carrying ribbon

Field backpack: 530 x 280 x 150 mm

Hard case*: 555 x 350 x 230 mm

2. Weights

Detector ready for service

with oval search head: approx. 2.5 kg

Transportation weight in field backpack: approx. 3.4 kg

Transport weight in the hard case* (with field backpack): approx. 8.8 kg

Cardboard box of hard case*: approx. 0.75 kg

Field backpack, empty: approx. 0.92 kg

Hard case*, empty: approx. 5 kg

Headset*: approx. 0.1 kg

Test piece: approx. 0.02 kg

Operation manual: approx. 0.05 kg

Search head oval: approx. 0.63 kg

Detector electronic (without batteries): approx. 1.65 kg

*) Optional accessory

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Metal Detector VMH3CS – Operation Manual

3. Power Supply:

Standard batteries: 3 x 1.5 volts (mono cells IEC R20/D-size)

preferably alkaline type

Ni-MH-accumulators*: 3 x 1.24 Volt (RSH 4 KR 35/62)

Multisource charging set*: 12 V car battery or

230 V mains supply

4. Operational Conditions

Battery life: approx. 18-25 hrs

Battery life depends on the age, quality and the capacity of the batteries.

Water tightness of search head: up to 1.5 m water depth

Distance between two mine detectors: approx. 2 m (refer to chapter 8)

Sweeping speed: 0.2 – 1.5 m/s – standard 0 - 0.2 m/s - pinpointing

5. Environmental Conditions for Storage, Transport and Operation, Rain and Temperature

According to MIL STD 810F, 501.4-II, 502.4-I, 502.4-II, 503.4, 506.4-III,

514.5 C1

Operation temperature: -32°C to +60°C

Storage temperature: -55°C to +75°C

*) Optional accessory

42

APPENDIX D –DIMENSIONAL DRAWINGS

Dimensional Drawings – Oval Search Head

Metal Detector VMH3CS – Operation Manual

43

Metal Detector VMH3CS – Operation Manual

APPENDIX E – SPARE PARTS

5 16 26

9

1 2 3

8 17

19 20

4

10 11

18 22

27 28 29

22 21

12 13 14 15

5

30

25

6 7

23 24

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Metal Detector VMH3CS – Operation Manual

Spare Parts – Detector Electronic

17

27 28

29

19 20

18

26

10, 11

12-15

22

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Metal Detector VMH3CS – Operation Manual

Spare Parts – Oval Search Head

1 2 3

4

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Metal Detector VMH3CS – Operation Manual

LIST OF SPARE PARTS

Pos.

*

Qty. VALLON-No. Description SL

1

*

1

8902290112 Brake of search head

1

2

*

1

2902290026 Pin Vukollan

1

3

*

1

8902290011 Screw, brake

1

4

*

1

8902290026 Fastening screw, brake

1

5

1

2902290114 Search head sealed

2

6

1

2902360103 Carrying bar search head oval

2

7

1

2502360101 Cable search head

2

8

1

8909990621 Ring nut M24x1,5

2

9

1

8902290104 Type foil for mode selector

1

10

1

5110306025 Data output socket/headset 6pole

2

11

*

1

2909990529 Cover 6 pole

1

12

1

8902290003 Protection for "mode selector"

2

13

*

1

5281001011 Collet chuck knob "mode selector"

1

14

1

5100801022 Step switch "mode selector"

2

15

1

5289001013 Cap

1

16

*

1

2909990622 Control panel cplt.

2

17

1

2902290043 Housing

2

18

1

2909990559 Module cplt., firmware vmc1s126_14H or higher

2

19

3

7090187001 Cheese head screw brass M3x20 olive

2

20

3

7110087001 Hexagon nut brass M3 DIN934 olive

2

21

1

2902290116 Back, mounted

2

22

2

7090187002 Cheese head screw brass M4x16 DIN84 olive

2

23

1

2902360102 Carrying bar cplt.

2

24

1

2502360102 Cable detector

2

25

1

9120001002 Dehydrating capsule

2

26

*

1

2909990564 Arm-rest

2

27

*

1

2902290106 Battery cover cplt.

1

28

*

1

9030102009 O-ring D=38x3

1

29

*

2

8909990613 Belt for battery cover

1

30

*

1

2909990530 Non-magnetic test piece

1

* Spare parts recommended by Vallon

SL 1 = Service Level 1 = repair at site / in the field SL 2 = Service Level 2 = workshop repair

Contents, specifications and availability are subject to change serving the technical improvement.

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Metal Detector VMH3CS – Operation Manual

APPENDIX F – UXO SEARCH HEAD (OPTIONAL ACCESSORY)

1. General

The large diameter search head which is available as special option provides

for the detection of metallic mines and UXO to large depths below the surface with reliable and consistent operation. It is delivered completely with a carry bag.

(1) adjustable arm-rest (2) control unit with hand grip (3) telescopic pole protected against twisting (4) plug-in connection (5) pluggable search head, round (Option) (6) battery compartment (7) connector

4

3

2

6

1

7

5

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Metal Detector VMH3CS – Operation Manual

NOTE

Switch OFF the detector before changing the search head.

NOTE

Upon switching ON the detector electronics recognizes which search

head has been connected and switches over the pulse control automatically.

NOTE

If you replace the search head by another one (for example from oval

search head to UXO search head), repeat the procedure as described in chapter 3.3, also if the soil is the same.

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Metal Detector VMH3CS – Operation Manual

2. TYPICAL TARGET DETECTION SIGNALS OF THE UXO SEARCH HEAD

Deeply buried, large metal mines and small metal parts near the surface can

be differentiated by an audio alarm signal.

Move the search head with continuous speed in parallel above the ground

surface.

Maximum detection signal means:

a) Maximum volume of the audio signal.

b) LEDs on the display are illuminated (length proportional to the strength

of the audio signal).

c) Vibration in the hand grip.

The maximum detection signal is produced in two different kinds.

1. Large metal objects if the center of the search head is positioned exactly

above the object

strength of audio signal

distance

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Metal Detector VMH3CS – Operation Manual

2. Small metal objects, if the border of the search head is positioned exactly

above the object.

strength of audio signal

distance

strength of audio signal

distance

strength of audio signal

distance

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Metal Detector VMH3CS – Operation Manual

3. DETECTION IN OVERGROWN AREAS WITH THE UXO SEARCH HEAD

The round UXO search head is recommended for the detection of unexploded

ordnances like shells, bomblets and other ammunition parts.

As the round UXO search head has a large penetration depth, it is recommended to keep a distance of approx. 20 cm to the ground.

This facilitates not only the swinging movements in dense vegetation but allows the safe detection of bomblets as well.

NOTE: The SOP’S have absolute priority to any

instruction manual.

NOTE: Move the search head continuously as the

detection system has a dynamic function principle and adapts itself continuously to the soil.

4. Technical Data which are different from Appendix C Dimensions

Telescopic pole

with round UXO search head: min. length: 984 mm  5 mm

max. length: 1324 mm ± 5 mm

Round UXO-Search head: 614 mm Ø

Carrying case UXO-Search head: 660 x 700 x 110 mm ± 5 mm

Weights

Detector ready for service

with round UXO search head: approx. 2.9 kg

Transport weight round UXO search head In carrying case: approx. 2.8 kg

UXO search head: approx. 1.1 kg

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Metal Detector VMH3CS – Operation Manual

5. Dimensional Drawing w ith round UXO Search Head

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Metal Detector VMH3CS – Operation Manual

6. Spare Parts – Round UXO Search Head

7. Assembling Set – Round UXO Search Head

35, 36

33

32

34

37.1

37.2

37.3

37.4

37.5

37.6

37.8

37.7

31

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Metal Detector VMH3CS – Operation Manual

LIST OF SPARE PARTS FOR UXO SEARCH HEAD (olive)

Pos * Qty. VALLON-No. Description SL

31

1 2902360111 UXO-Search head round cplt. VMH3CS 2

32

1 2902270004 Search head round 60 cm 2

33

1 8900920008 Brake screw 1

34

1 8900920010 Bushing Vukollan 1

35

1 2902360112 Carrying bar search head round 2

36

1 2502340102 Cable search head round cplt. 2

37

1 2909990418 Assembling Set cplt. 2

37.1

1 2909990416 Cable conduct cplt. 2

37.2

1 9030103022 O-Ring 3,5 x 3 2

37.3

4 7090177004 Raised countersunk headscrew M4x10 DIN964 2

37.4

1 8909990522 Conduit plate 2

37.5

1 9030102002 O-Ring 23 x 2,5 2

37.6

1 8900920009 Hinge pin 1

37.7

1 8900920011 Washer 1

37.8

1 7090151026 Screw PA DIN 85 black M4X12 1

* Spare parts recommended by Vallon

SL 1 = Service Level 1 = repair at site / in the field SL 2 = Service Level 2 = workshop repair

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Metal Detector VMH3CS – Operation Manual

APPENDIX G – STICK PROBE (OPTIONAL ACCESSORY)

1. General

The stick probe search head is available as optional accessory. It allows the detection of metal mines or IEDs in fissures and cavities of stones, trunks and walls.

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Metal Detector VMH3CS – Operation Manual

The detection area is on the left and right side of the white sign on the top of the stick probe. That means for checking a hole the stick probe must be turned by 90° to reach all sides.

2. Technical Data which are different from Appendix C

Dimensions

Telescopic pole with stick probe: min. length: 935 mm  5 mm max. length: 1278 mm ± 5 mm

Length of stick probe: 445 mm  5 mm Diameter of stick probe: 40 mm Ø Length of detection zone: 120 mm

Weights

Detector ready for service with stick probe: approx. 2.3 kg Stick probe: approx. 0.58 kg

white marking

detection direction detection direction

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Metal Detector VMH3CS – Operation Manual

3. Dimensional Drawing with Stick Probe

Contents, specifications and availability are subject to change serving the technical improvement.

Searching with Excellence

Vallon GmbH • Arbachtalstr. 10 • 72800 Eningen • Germany

Tel.: + 49 7121 9855 0 • Fax: + 49 7121 9855 100 • info@vallon.de www.vallon.de

Vallon VMH3CS Operation Manual

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