Bosch GMS 120 Professional User Manual

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GMS 120

Professional

Robert Bosch GmbH

Power Tools Division
70745 Leinfelden-Echterdingen
Germany

www.bosch-pt.com

GMS 120 Professional

2 609 140 939 (2012.03) T / 157 XXX

de Originalbetriebsanleitung
en Original instructions
fr Notice originale
es Manual original
pt Manual original
it Istruzioni originali
nl Oorspronkelijke gebruiksaanwijzing
da Original brugsanvisning
sv Bruksanvisning i original
no Original driftsinstruks
fi Alkuperäiset ohjeet

el Рсщфьфхрп пдзгйюн чсЮузт

tr Orijinal işletme talimat

pl Instrukcja oryginalna

cs Původní návod k používání
sk Pôvodný návod na použitie
hu Eredeti használati utasítás

ru Оригинальное руководство по

эксплуатации

uk Ориг³нальна ³нструкц³я з експлуатац³¿

ro Instrucţiuni originale

bg Оригинална инструкция

sr Originalno uputstvo za rad
sl Izvirna navodila
hr Originalne upute za rad

et Algupärane kasutusjuhend
lv Instrukcijas oriģinālvalodā
lt Originali instrukcija

ja オリジナル取扱説明書

正本使用说明书

cn
tw 正本使用說明書
ko 사용 설명서 원본
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2 609 140 939 | (8.3.12) Bosch Power Tools

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2 609 140 939 | (8.3.12) Bosch Power Tools

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2 609 140 939 | (8.3.12) Bosch Power Tools

10 | English

English

Safety Notes

Read and observe all instructions. SAVE

THESE INSTRUCTIONS FOR FUTURE REFER­ENCE.

f Have the measuring tool repaired only through quali-

fied specialists using original spare parts. This ensures

that the safety of the measuring tool is maintained.

f Do not operate the measuring tool in explosive environ-

ments, such as in the presence of flammable liquids,
gases or dusts. Sparks can be created in the measuring

tool which may ignite the dust or fumes.

f For technological reasons, the measuring tool cannot

ensure 100 % certainty. To rule out hazards, safeguard
yourself each time before drilling, sawing or routing in
walls, ceilings or floors by means of other information
sources, such as building plans, pictures from the con­struction phase, etc. Environmental influences, such as

humidity or closeness to electrical devices, can influence
the accuracy of the measuring tool. Surface quality and
condition of the walls (e.g., moisture, metallic building ma­terials, conductive wallpaper, insulation materials, tiles)
as well as the amount, type, size and position of the objects
can lead to faulty measuring results.

Product Description and
Specifications

Please unfold the fold-out page with the representation of the
measuring tool and leave it unfolded while reading the operat­ing instructions.

Intended Use

The measuring tool is intended for the detection of metals
(ferrous and non-ferrous metals, e.g., rebar), joists and “live”
wires/conductors in walls, ceilings and floors.

Product Features

The numbering of the product features shown refers to the
illustration of the measuring tool on the graphic page.

1 Illuminated ring
2 Marking hole
3 Display
4 Operating-mode indication
5 On/Off button
6 Display-illumination button
7 Audio signal button
8 Button for detecting “live” conductors/Operating mode

“Power cable”

9 Button for metal detection/Operating mode “Metal”

10 Button for detecting wood and metal beams/Operating

mode “Drywall”

11 Contact pads
12 Sensor area
13 Type plate
14 Battery lid
15 Latch of battery lid
16 Fixture for carrying strap
17 Protective pouch
18 Carrying strap

The accessories illustrated or described are not included as stand­ard delivery.

English | 11

Display Elements (see figure A)

a Switched-off audio signal indicator
b Warning-function indicator
c Indication of the object type “Non-metal object”
d Indication of the object type “Non-magnetic metal”
e Indication of the object type “Magnetic metal”

f Indication of the object type “Live conductor”
g Temperature control indicator
h Battery indicator

i Measuring indicator
j Fine scale

k Indication “CENTER”

Technical Data

Digital Detector GMS 120

Article number
Maximum scanning depth*

– Ferrous metals
– Non-ferrous metals (copper)
– Live conductors 110– 230 V

(voltage applied)**

– Wood
Automatic switch-off after approx.
Operating temperature
Storage temperature
Battery
Operating life time, approx.
Weight according to

EPTA-Procedure 01/2003
Degree of protection

*depending on operating mode, material and size of the objects, as well
as material and condition of the base material

**less scanning depth for wires/conductors that are not “live”

f In terms of accuracy, the measuring result can be inferior in case

of unfavourable surface quality of the base material.

3 601 K81 0..

120 mm

80 mm

50 mm
38 mm

5min
–10°C...+50°C
–20°C...+70°C

1 x 9 V 6LR61

270 g

IP 54 (dust and splash

water protected)

Declaration of Conformity

We declare under our sole responsibility that the product
described under “Technical Data” is in conformity with the fol­lowing standards or standardization documents:
EN 61010-1:2010-10, EN 61326-1:2006-05,
EN 301489-3:2002-08, EN 301489-1:2008-04,
EN 300330-1:2010-02, EN 300330-2:2010-02 according
to the provisions of the directives 2011/65/EU,
2004/108/EC, 1999/5/EC.

Dr. Egbert Schneider
Senior Vice President
Engineering

Robert Bosch GmbH, Power Tools Division
D-70745 Leinfelden-Echterdingen
Leinfelden, 02.03.2012

Bosch Power Tools 2 609 140 939 | (8.3.12)

Helmut Heinzelmann
Head of Product Certification
PT/ETM9

Assembly

Inserting/Replacing the Battery

Alkali-manganese batteries are recommended for the meas­uring tool.

To open the battery lid 14, press the latch 15 in the direction
of the arrow and fold up the battery lid. Insert the supplied
battery. Pay attention that the polarity is correct, according to
the representation on the inside of the battery lid.

The battery indicator h always indicates the current battery
status:

– Battery fully charged
– Battery has 2/3 of its capacity or less
– Battery has 1/3 of its capacity or less
– Please change battery

f If the measuring tool is not used for a long period of

time, the battery must be removed. The battery can cor-

rode or discharge itself over long periods.

Operation

f Protect the measuring tool against moisture and direct

sun light.

f Do not subject the measuring tool to extreme tempera-

tures or variations in temperature. In case of large var­iations in temperature, allow the measuring tool to ad­just to the ambient temperature before switching it on.

In case of extreme temperatures or variations in tempera-

5h

ture, the accuracy of the measuring tool and the display in­dication can be impaired.

f Use or operation of transmitting systems, such as

WLAN, UMTS, radar, transmitter masts or microwaves,
in the close proximity can influence the measuring
function.

Initial Operation

Switching On and Off
f Before switching the measuring tool on, make sure that

the sensor area 12 is not moist. If required, dry the meas-

uring tool using a soft cloth.

f If the measuring tool was subject to an extreme tem-

perature change, allow it to adjust to the ambient tem­perature before switching on.

To switch on the measuring tool, press the On/Off button 5.
To switch off the measuring tool, press the On/Off button 5

again.
When no button on the measuring tool is pressed for approx.

5 minutes and when no objects are detected, the measuring
tool automatically switches off to save the battery.

Switching the Display Illumination On/Off

The display illumination can be switched on/off with display­illumination button 6.

Switching the Audio Signal On/Off

The audio signal can be switched on/off with the audio signal
button 7. When the audio signal is switched off, indication a
appears on the display.

12 | English

Method of Operation (see figures A–B)

The measuring tool checks the base material of sensor area
12 in measurement direction A to the max. detection depth
(see “Technical Data”). Objects are detected that differ from
the material of the wall.

Always move the measuring tool in a straight line over the sur­face applying slight pressure, without lifting it off or changing
the pressure. During measurement, the contact pads 11 must
always have contact to the surface.

Measuring Procedure

Position the measuring tool on/against the surface being
detected, and move it in direction B. When the measuring tool
comes closer to an object, the amplitude in measuring indica­tor i increases and ring 1 lights up yellow; when it is moved
away from the object, the amplitude decreases. Measuring
indicator i indicates the maximal amplitude above the centre
of the object; ring 1 lights up red and an audio signal sounds.
For small or deeply embedded objects, ring 1 can continue to
light up yellow, while there is no audio signal.

f Wide objects are not indicated by the illuminated ring

or the audio signal throughout their complete width.

To localise the object more precisely, move the measuring
tool repeatedly (3x) back and forth over the object. The fine
scale j is automatically activated in all operating modes. Fine
scale j indicates a full amplitude when the object is below the
centre of the sensor or when the maximum amplitude of
measuring indicator i is reached. In the operating modes
“Drywall” and “Metal”, the indication “CENTER” k lights up
additionally.

Wider objects in the base material are detected through a
continuous, high amplitude of measuring indicators i and j.
Ring 1 lights up yellow. The duration of the high amplitude
corresponds approximately with the object width.

When very small or deeply embedded objects are being
sought and measuring indicator i reacts only slightly, move
the measuring tool repeatedly over the object in horizontal
and vertical direction. Pay attention to the amplitude of fine
scale j, and when in operating mode “Drywall” and “Metal”,
additionally to the
low for precise detection.

f Before drilling, sawing or routing into a wall, protect

yourself against hazards by using other information
sources. As the measuring results can be influenced

through ambient conditions or the wall material, there may
be a hazard even though the indicator does not indicate an
object in the sensor range (no audio signal or beep and and
the illuminated ring 1 lit green).

“CENTER ” k indication, which will then al-

Operating Modes

The best measuring results are achieved through selection of
the operating modes. The maximal detection depth for metal
objects is achieved in the operating mode “Metal”. The max­imal detection depth for “live” conductors is achieved in the
operating mode “Power cable”. The selected operating
mode can be recognized at any time via the green illuminated
operating-mode indication 4.

2 609 140 939 | (8.3.12) Bosch Power Tools

Drywall

The operating mode “Drywall” is suitable for detecting wood
or metal objects in drywalls.

Press button 10 to activate the operating mode “Drywall”.
The operating-mode indication 4 above button 10 lights up
green. As soon as the measuring tool is positioned against the
base material to be detected, ring 1 lights up green and sig­nals operational readiness.

In the operating mode “Drywall” all object types are detected
and indicated:

– Non-metal, e.g. a wood beam
– Magnetic, e.g. reinforcing steel
– Non-magnetic, but metal, e.g. copper pipe
– “Live”, e.g. a “live” conductor

Notes: In the operating mode “Drywall”, other objects, apart
from wood and metal objects and “live” conductors are also
detected, such as plastic tubing filled with water. For such
objects, the indication c for non-metal objects is indicated in
display 3.

Nails and screws in the base material may cause a wooden
beam to be indicated as a metal object on the display.

When display 3 indicates a continuously high amplitude of
measuring indicator i and fine scale j, restart the measuring
procedure again by positioning the measuring tool at a differ­ent location on the base material.

When the illuminated ring 1 does not signal operational read­iness when positioning the measuring tool on the base mate­rial being detected, the measuring tool cannot properly de­tect the base material.
– Press and hold button 10 until the illuminated ring lights up

green.

– When starting a new measuring procedure afterwards and

positioning the measuring tool onto a different wall or sur­face, you must briefly press button 10.

– In rare cases, the measuring tool may not be able to detect

the base material because the side with the sensor area 12
and the type plate 13 is soiled or dirty. Clean the measur­ing tool with a dry, soft cloth and restart the measuring pro­cedure.

Metal

The operating mode “Metal” is suitable for detecting magnet­ic and non-magnetic objects independent of the wall material.

Press button 9 to activate the operating mode “Metal”. The il-
luminated ring 1 and indication 4 above button 9 light up
green.

When the detected metal object is of magnetic metal (e.g.
iron), the symbol e is indicated on display 3. For non-magnet­ic metals, the symbol d is indicated. In order to differentiate
between metal types, the measuring tool must be positioned
above the detected metal object (ring 1 is lit red).

Note: For reinforcement steel mesh and steel in the examined
base material, an amplitude is indicated over the complete
surface of measuring indicator i. For reinforcement steel
mesh, it is typical that the symbol e for magnetic metal is indi­cated on the display directly above the iron rods, whereas be­tween the iron rods, the symbol d for non-magnetic metal will
appear.

Power Cable

The operating mode “Power cable” is suitable only for de­tecting "live" conductors (110– 230 V).

Press button 8 to activate the operating mode “Power cable”.
The illuminated ring 1 and indication 4 above button 8 light up
green.

When a “live” conductor is detected, indication f appears on
the display 3. Move the measuring tool repeatedly over the ar­ea to localise the “live” conductor more precisely. After mov­ing over the “live” conductor several times, it can be indicated
very accurately. When the measuring tool is very close to the
conductor, the illuminated ring 1 flashes red and the audio
signal beeps swiftly.

Notes:

– “Live” conductors are indicated in any operating mode.
– “Live” conductors can be detected easier when power con-

sumers (e.g. lamps, machines) are connected to the
sought conductor and switched on.

– Under certain conditions (such as below metal surfaces

or behind surfaces with high water content), “live” con­ductors cannot be securely detected. The signal

strength of a “live” conductor depends on the position of
the cable. Therefore, apply further measurements in close
proximity or use other information sources to check if a
“live” conductor exists.

– Voltage-free conductors can be detected as metal objects

in the operation mode “Metal”. This does not apply for
stranded conductors (contrary to solid conductors or
cable).

– Static electricity can lead to inaccurate indication of elec-

tric lines, e.g., over a large range. To improve the indica­tion, place your free hand flat on the wall next to the meas­uring tool, in order to remove the static electricity.

Working Advice

f Measuring values can be impaired through certain am-

bient conditions. These include, e.g., the proximity of
other equipment that produce strong magnetic or elec­tromagnetic fields, moisture, metallic building materi­als, foil-laminated insulation materials or conductive
wallpaper or tiles. Therefore, please also observe other

information sources (e.g. construction plans) before drill­ing, sawing or routing into walls, ceilings or floors.

Marking Objects

If required, detected objects can be marked. Perform a meas­urement as usual. Once you have found the boundaries or the
centre of an object, mark the sought location through the
marking hole 2.

Temperature Control

The measuring tool is equipped with a temperature control indi­cator, as accurate measurements are only possible as long as
the temperature within the measuring tool remains constant.

When the temperature control indicator g lights up, the meas­uring tool is not within the operating temperature range or
was subject to large variations in temperature. Switch the

measuring tool off and allow it to adjust to the ambient
temperature before switching it on again.

English | 13

Warning Function

When indicator b lights up on display 3 and indication 4 flash­es above button 10, the measurement must be restarted. Re­move the measuring tool from the wall and place it on the base
material at a different location.

When indicator b flashes on display 3, send the measuring
tool in the provided protective pouch to an authorised cus­tomer services agent.

Recalibration

When measuring indicator i indicates a continuously high am­plitude in the operating mode “Metal”, even though there is
no metal object near the measuring tool, the measuring tool
can be manually recalibrated.

– Switch the measuring tool off.
– Remove all objects near the measuring tool that could be

detected, including your wrist watch or rings made of
metal, and hold the measuring tool up.
Pay attention that battery indicator h indicates at least 1/3
capacity:
Hold the measuring tool in such a manner that the type
plate 13 faces toward the ground. Avoid bright light sourc­es or direct sunlight from shining on the area 12 and 13,
without covering off this area.

– Press and hold buttons 5 and 7 until the illuminated ring 1

lights up red. Then release both buttons.

– When the calibration was successful, the measuring tool

will automatically start after a few seconds, and will be
ready for operation again.

Note: If the measuring tool does not automatically start,
repeat the recalibration. If the measuring tool still does not
start, send it in the provided protective pouch to an author­ised customer services agent.

Maintenance and Service

Maintenance and Cleaning

f Check the measuring tool each time before use. In case

of visible damage or loose components inside the measur­ing tool, safe function can no longer be ensured.

Keep the measuring tool clean and dry at all times to ensure
proper and safe working.

Do not immerse the measuring tool in water or other fluids.
Wipe away debris or contamination with a dry, soft cloth. Do

not use cleaning agents or solvents.
In order not to affect the measuring function, decals/stickers or

name plates, especially metal ones, may not be attached in the
sensor area 12 on the front or back side of the measuring tool.

Do not remove the contact pads 11 on the backside of the
measuring tool.

If the measuring tool should fail despite the care taken in
manufacturing and testing procedures, repair should be
carried out by an authorised after-sales service centre for
Bosch power tools. Do not open the measuring tool yourself.

In all correspondence and spare parts orders, please always
include the 10-digit article number given on the type plate of
the measuring tool.

Bosch Power Tools 2 609 140 939 | (8.3.12)

14 | English

Store and transport the measuring tool only in the supplied
protective pouch.

In case of repairs, send in the measuring tool packed in its
protective pouch 17.

After-sales Service and Customer Assistance

Our after-sales service responds to your questions concern­ing maintenance and repair of your product as well as spare
parts. Exploded views and information on spare parts can
also be found under:

www.bosch-pt.com

Our customer service representatives can answer your ques­tions concerning possible applications and adjustment of
products and accessories.

Great Britain

Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham
Uxbridge
UB 9 5HJ
Tel. Service: [phone]
Fax: [phone]
E-Mail: [e-mail]

Ireland

Origo Ltd.
Unit 23 Magna Drive
Magna Business Park
City West
Dublin 24
Tel. Service: [phone]
Fax: [phone]

Australia, New Zealand and Pacific Islands

Robert Bosch Australia Pty. Ltd.
Power Tools
Locked Bag 66
Clayton South VIC 3169
Customer Contact Center
Inside Australia:
Phone: [phone]
Fax: [phone]
Inside New Zealand:
Phone: [phone]
Fax: [phone]
Outside AU and NZ:
Phone: [phone]
www.bosch.com.au

Republic of South Africa
Customer service

Hotline: [phone]

Gauteng – BSC Service Centre

35 Roper Street, New Centre
Johannesburg
Tel.: [phone]
Fax: [phone]
E-Mail: [e-mail]

2 609 140 939 | (8.3.12) Bosch Power Tools

KZN – BSC Service Centre

Unit E, Almar Centre
143 Crompton Street
Pinetown
Tel.: [phone]
Fax: [phone]
E-Mail: [e-mail]

Western Cape – BSC Service Centre

Democracy Way, Prosperity Park
Milnerton
Tel.: [phone]
Fax: [phone]
E-Mail: [e-mail]

Bosch Headquarters

Midrand, Gauteng
Tel.: [phone]
Fax: [phone]
E-Mail: [e-mail]

People’s Republic of China
China Mainland

Bosch Power Tools (China) Co., Ltd.
567, Bin Kang Road
Bin Jiang District 310052
Hangzhou, P.R. China
Service Hotline: [phone]
Fax: [phone]
E-Mail: [e-mail]
www.bosch-pt.com.cn

HK and Macau Special Administrative Regions

Robert Bosch Hong Kong Co. Ltd.
21st Floor, 625 King’s Road
North Point, Hong Kong
Customer Service Hotline: [phone]
Fax: [phone]
E-Mail: [e-mail]
www.bosch-pt.com.hk

Indonesia

PT. Multi Mayaka
Kawasan Industri Pulogadung
Jalan Rawa Gelam III No. 2
Jakarta 13930
Indonesia
Tel.: [phone]
Fax: [phone] 23
E-Mail: [e-mail]
www.bosch-pt.co.id

Philippines

Robert Bosch, Inc.
28th Floor Fort Legend Towers,
3rd Avenue corner 31st Street,
Fort Bonifacio Global City,
1634 Taguig City, Philippines
Tel.: [phone]
Fax: [phone]
[e-mail]
www.bosch-pt.com.ph

Bosch Service Center:
9725-27 Kamagong Street
San Antonio Village
Makati City, Philippines
Tel.: [phone]
Fax: [phone]
[e-mail]

Malaysia

Robert Bosch (S.E.A.) Sdn. Bhd.
No. 8A, Jalan 13/6
G.P.O. Box 10818
46200 Petaling Jaya
Selangor, Malaysia
Tel.: [phone]
Fax: [phone]
[e-mail]
Toll-Free: 1800 880 188
www.bosch-pt.com.my

Thailand

Robert Bosch Ltd.
Liberty Square Building
No. 287, 11 Floor
Silom Road, Bangrak
Bangkok 10500
Tel.: [phone] – 18 88 (10 lines)
Fax: [phone]
Robert Bosch Ltd., P. O. Box 2054
Bangkok 10501, Thailand

Bosch Service – Training Centre
2869-2869/1 Soi Ban Kluay
Rama IV Road (near old Paknam Railway)
Prakanong District
10110 Bangkok
Thailand
Tel.: [phone] – 4
Fax: [phone]
Fax: [phone]

Singapore

Robert Bosch (SEA) Pte. Ltd.
11 Bishan Street 21
Singapore 573943
Tel.: [phone]
Fax: [phone]
[e-mail]
Toll-Free: 1800 333 8333
www.bosch-pt.com.sg

Vietnam

Robert Bosch Vietnam Co. Ltd
10/F, 194 Golden Building
473 Dien Bien Phu Street
Ward 25, Binh Thanh District
84 Ho Chi Minh City
Vietnam
Tel.: [phone] ext. 413
Fax: [phone]
[e-mail]
www.bosch-pt.com

Français | 15

Disposal

Measuring tools, accessories and packaging should be sorted
for environmental-friendly recycling.

Do not dispose of measuring tools and batteries/rechargea­ble batteries into household waste!

Only for EC countries:

According to the European Guideline
2002/96/EC, measuring tools that are no
longer usable, and according to the European
Guideline 2006/66/EC, defective or used
battery packs/batteries, must be collected
separately and disposed of in an environ­mentally correct manner.

Batteries no longer suitable for use can be directly returned at:

Great Britain

Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham
Uxbridge
UB 9 5HJ
Tel. Service: [phone]
Fax: [phone]
E-Mail: [e-mail]

Subject to change without notice.

Bosch Power Tools 2 609 140 939 | (8.3.12)