Bosch Power Tools D-Tect 120 User manual

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Operating/Safety Instructions
Consignes de fonctionnement/sécurité
Instrucciones de funcionamiento y seguridad

D-tect 120

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General Safety Rules

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WARNING

strictly followed.

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WARNING

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WARNING

moisture, metallic building materials, foil-laminated insulation materials and/or conductive wallpaper.

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WARNING

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WARNING

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penetrating the surface. Such additional sources include construction plans, visible points of entry
of pipes and wiring into walls, such as in a basement, and standard 16” and 24” stud spacing
practices.

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WARNING

items when operational can result in personal injury.

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WARNING

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.

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Working safely with the measuring tool is possible only when the operating and
safety information are read completely and the instructions contained therein are

Read all instructions. Failure to follow all instructions listed below may result in
electric shock, fire and/or serious injury.

SAVE THESE INSTRUCTIONS

The detector’s ability to detect objects is affected by the proximity of other
equipment that produce strong magnetic or electromagnetic fields, and by

The detector’s ability to detect wood substructures (studs) is also affected by
inconsistency on the thickness of the surface material, such as plaster and lath.

It is possible that there may be metal, wood or wiring or something else, such as
plastic pipes, beneath the scanned surface that is not detected.

The detector alone should not be relied on exclusively to locate items below
the scanned surface. Use other information sources to help locate items before

Before penetrating a surface (such as with a drill, router, saw or nail), always shut
off the electrical power, gas and water supplies. Cutting, drilling, etc… into these

For technological reasons, the measuring tool cannot ensure 100 % certainty. To
rule out hazards, safeguard yourself each time before drilling, sawing or routing in

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WARNING

measuring tool which may ignite the dust or fumes.

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WARNING

FCC Statement

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WARNING

equipment.
Note: This equipment has been tested and found to comply with the limits for industrial and

commercial ISM equipment, persuant to part 18 of the FCC rules.
These limits are designed to provide reasonable protection against harmful interference when the

equipment is operated in a commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in
a residential area is likely to cause harmful interference in which case the user will be required to
correct the interference at his own expense.

Do not operate the measuring tool in explosive environments, such as in the
presence of flammable liquids, gases or dusts. Sparks can be created in the

Have the measuring tool repaired only through qualified specialists using original
spare parts. This ensures that the safety of the measuring tool is maintained.

Changes or modifications to this unit not expressly approved by the party
responsible for compliance could void the user’s authority to operate the

Electrical Safety

!

WARNING

To reduce this risk:
ALWAYS follow all instructions and warnings

on the battery label and package.

DO NOT short any battery terminals.
DO NOT charge alkaline batteries.
DO NOT mix old and new batteries. Replace all

of them at the same time with new batteries of
the same brand and type.

Batteries can explode or leak,
and can cause injury or fire.

DO NOT mix battery chemistries.
DISPOSE of batteries per local code.
DO NOT dispose of batteries in fire.
KEEP batteries out of reach of children.
REMOVE batteries if the device will not be used

for several months.

Symbols

IMPORTANT: Some of the following symbols may be used on your tool. Please study them and

learn their meaning. Proper interpretation of these symbols will allow you to operate the tool better
and safer.

Warning Symbol

Alerts user to warning
messages

Read Manual Symbol

Alerts user to read manual

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Functional Description

Optimal operation of the detection tool is possible only when the operating instructions and
information are read completely, and the instructions contained therein are strictly followed.

Intended Use

The measuring tool is intended for the detection of objects in walls, ceilings and floors. Depending
on the material and condition of the base material, it is possible to detect metal objects, joists,
water-filled plastic pipes, conductors and cables.

Features

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

1 Marking aid, top
2 LED
3 Display
4 Marking aid, left and right
5 Audio signal button
6 On/Off button
7 Button for operating mode Concrete
8 Button for operating mode Universal
9 Button for operating mode Drywall
10 Grip area
11 AA battery adapter
12 Unlocking button for AA battery adapter

sealing cap

13 AA battery adapter sealing cap
14 Sensor area
15 Serial number

Display Elements

a Indication of the object type “Live

conductor”

b Battery indicator
c Switched-off audio signal indicator
d “Interference by radio waves” indicator
e Battery temperature control indicator
f Warning-function indicator
g “Service required” indicator
h Measuring indicator
i “Center cross” indicator of the object’s

center

j Movement indicator
k Orientation arrows to determine the object’s

center

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Technical Data

Article number ...............3 601 K81 310

Maximum scanning depth*

– Operating Mode Concrete . .4.75-in (3.9-in typ.)
120 mm (100 mm typ.)

– Metal objects ........4.75-in (3.9-in typ.)

120 mm (100 mm typ.)
– Cables and water-filled . . 2.36-in (60 mm)

plastic pipes

– Operating Mode Universal ....2.36-in (60 mm)

– Operating Mode Drywall ......2.36-in (60 mm)

Measuring accuracy to the

object’s center* ............. ±0.39-in (± 10 mm)

Minimum distance between

two adjacent objects* ...........1.97-in (50 mm)

Operating temperature ..........14° F to 104° F

(–10° to +40° C)

Storage temperature ............-4° F to 158° F

Preparation

(-20° C to +70° C)

Automatic switch-off after approx. ..........5 min

Batteries ........................ 4 x AA 1.5V

Max. humidity for the ...... 90% relative humidity

detection of objects. (non-condensing)

Max. humidity for the ...... 50% relative humidity

classification of power cables

Weight ......................... 1.1 lb (0.5kg)

* Depending on size and type of object as well as

material and condition of the base material

The measuring tool can be clearly identified with the

serial number 15 on the type plate.

In terms of accuracy and scanning depth, the
measurement result can be inferior in case of
unfavorable surface quality of the base material.

Inserting/Removing the Batteries

(see figure C)

The measuring tool operates with AA batteries.
Use only alkaline batteries.

Inserting AA Batteries

Invert measuring tool and place
batteries into slot 11 as per
the illustration. Next, slide the
sealing cap 13 over the batteries
until you feel it engage and it is
flush with the handle.

Removing AA Batteries

Invert measuring tool and press the unlocking
buttons 12 of the sealing cap 13. Pull off the
sealing cap. Make sure the batteries do not fall
out in the process. Remove the batteries.

Battery Indicator

The battery indicator b always displays 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
Battery has 10% capacity or less
Change battery

Always replace all batteries at the same time.
Only use batteries from one brand and with the
identical capacity.

!

WARNING

Remove the batteries from
the tool when not using

it for extended periods. When storing for

extended periods, the batteries can corrode
and discharge themselves.

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Operation

Protect the measuring tool against moisture
and direct sun light.

Do not subject the measuring tool to
extreme temperatures or variations in
temperature. As an example, do not leave it

in vehicles for longer periods. In case of large
variations in temperature, allow the measuring
tool to adjust to the ambient temperature before
putting it into operation.

Hold the measuring tool only at the intended
grip area 10, so as not to influence the
measurement.

Use or operation of transmitting systems,
such as WLAN, UMTS, radar, transmitter
masts or microwaves, in the close proximity
can influence the measuring function.

The measuring values can be impaired
through certain ambient conditions.

These include, e.g. the proximity of devices
that produce strong electric, magnetic or
electromagnetic fields, moisture, metallic
building materials, foil-laminated insulation
materials or conductive wallpaper or tiles.
Therefore, also observe other information
sources (e.g. construction plans) before drilling,
sawing or routing into walls, ceilings or floors.

Switching On and Off

Check the measuring tool before each use. In
the following cases, safe function can no longer
be ensured:

– The measuring indicator h constantly

deflects, even though you hold the device in
the air.

– The measuring indicator does not deflect,

even though you keep a finger in the sensor
area.

– The device has visible damage or loose

components inside the measuring tool.

Before switching the measuring tool on,
make sure that the sensor area 14 is not
moist. If required, dry the measuring tool using

a soft cloth.

If the measuring tool was subject to an
extreme temperature change, allow it to
adjust to the ambient temperature before
switching on.

To switch on the measuring tool, press the On/
Off button 6

To switch off the measuring tool, press the On/
Off button 6

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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 Audio Signal

On/Off

The audio signal can be switched on/off with

5

the audio signal button
signal is switched off, the display 3 indicates the
information c.

. When the audio

Method of Operation

(see figure B)

The measuring tool checks the base material
of the sensor area 14 in measurement direction
A. Objects are detected that differ from the
material of the wall.

Always move the measuring tool over the base
material applying light pressure, without lifting it
off or changing the pressure.

The measuring tool can be moved in any
direction B.

Operation Modes

As soon as the measuring tool is switched on,
you can switch between different operating
modes.

By selecting the operating modes, you can
adjust the measuring tool to different wall
materials and, if required, suppress unwanted
objects.

If the wall material is not known, you should
begin with the Universal mode.

The selected operating mode is indicated by the
illuminated button.

Drywall (default mode)

The operating mode “Drywall” is suitable
for detecting joists, metal supports,

electrical lines and cables in drywalls
(wood, plasterboard, etc.). Water-filled plastic
pipes are also indicated. Empty plastic pipes are
normally not detected. The maximum measuring
depth is 2.36-in (6 cm).

Universal

The operating mode “Universal”
is suitable for most applications in

masonry. Metal objects, water-filled
plastic pipes, electrical lines and cables are
indicated. Cavities in building brick or empty

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plastic pipes with a diameter of less than 0.75-in
(2 cm) may not be displayed. The maximum
measuring depth is 2.36-in (6 cm).

Concrete

The operating mode “Concrete” is
especially suitable for applications in

reinforced concrete. Rebars, metal
pipes, water-filled plastic pipes, electrical
lines and cables are indicated. The maximum
measuring depth is 4.75-in (12 cm).

Measuring Procedure

Locating objects

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WARNING

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 the illuminated LED 2 lit green).

Position the measuring tool on/against the
surface being inspected.

If there is already an object below the
measuring tool when it is placed down, the
LED 2 lights up red if there is sufficient signal
strength, the measuring indicator h deflects and
a signal sounds.

If an object has not yet been detected when the
tool is placed down, the movement indicator j

is displayed and the LED 2 lights up yellow.
Move the measuring tool over the surface
without lifting it off, until the movement indicator
j disappears. Then the LED 2 lights up green
at places where the measuring device has not
detected an object.

When the measuring tool approaches an
object, the deflection in the measuring indicator
h increases and the LED 2 lights up red. The
deflection decreases when the measuring tool
moves away from an object.

With small or low-lying objects the LED 2 can
continue to light up yellow and the signal does
not sound.

Determining the Object’s Center

If an object is detected, the LED 2 lights up
red and with sufficient signal strength, the
orientation arrows k are displayed to determine
the object’s center. To specifically locate the
object’s center, move the measuring tool in
the direction of the orientation arrows k. If the
orientation arrows are not displayed, an object

Before drilling, sawing or
routing into a wall, protect

may nevertheless be located in the immediate
vicinity.

The measuring indicator h indicates the
maximum deflection when it is situated over
the center of an object, the LED 2 lights up
red and if there is sufficient signal strength, the
center cross i is displayed. For a more accurate
determination of the object’s center, pay
attention to the square which if there is sufficient
signal strength is shown in the immediate
vicinity of the object’s center in addition to the
center cross i.

Wider objects in the base material can be
identified by a continuous, high deflection of the
measuring indicator h. The LED 2 lights up red.

Always pay attention to all the signals of the
measuring tool (LED, measuring indicator,
orientation arrows).

To rule out hazards, safeguard yourself before
you drill, saw or rout in walls, by means of other
information sources. As the measuring results
can be influenced by ambient conditions or
the wall material, there may be a hazard even
though the indicator does not indicate an object
in the sensor area (there is no signal sound and
the LED 2 lights up green).

Power Cable

When a live conductor is detected, the display
3 also indicates a
red and the signal sounds with a quick tone
sequence.

Notes:

“Live” conductors are indicated in any

operating mode.

“Live” conductors can be detected easier

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

“Live” Wire Detection

!

WARNING

listed below may result in property damage,
electric shock, fire and/or serious injury.

Under certain conditions (such as when
behind metalized or conductive surfaces,
shielded in metal conduit or behind surfaces
with high water content/moisture), “live”
wires/conductors cannot be detected with
certainty. These ranges may be recognized
as metal objects. The signal strength of a
“live” wire/conductor depends on the position
of the cable. Therefore, apply further mea-

. The LED 2 flashes

Read all instructions. Fail­ure to follow all instructions

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surements in close proximity or use other
information sources to check if a “live” wire/
conductor exists.

• Three-phase wiring is possibly not de-

tected as “live” conductor.

• Wires that are not “live” may be detected

as metal objects or may not be detected.
This includes solid copper cables, however
stranded copper cables are not detectable.

• Static electricity can lead to inaccurate de-

tection of electrical wires, especially, over
a large range. It may help to put a hand on
the wall next to the detector and measure
again in order to help remove the static
electricity.

Detection values can be impaired through
certain ambient conditions. These include,
but are not limited to, the proximity of other
equipment that produces strong magnetic
or electromagnetic fields, moisture, metallic
building materials, foil-laminated insulation
materials or conductive wallpaper or tiles.
Therefore, please also consult other informa­tion sources (e.g. construction plans) before
drilling, sawing or routing into walls, ceilings
or floors.

Before penetrating surface (such as with a
drill, router, saw or nail), always shut off the
electrical power, gas and water supplies.
Cutting, drilling, etc. into these items when
operational can result in personal injury.

Marking Objects

If required, detected objects can be marked.
Perform measurement as described. Once
you have found the boundaries or the center
of an object, mark the sought location at the
top marking aid 1 and the side marking aid

4. Connect both points with a vertical and
horizontal line. The object is located at the

intersection of the lines.

Working Advice

Temperature Control
Note: If the device is lifted off the wall, a signal

may be shown temporarily.
When the temperature control indicator e lights

up, the battery of the measuring tool is not
within the operating temperature range or was
subject to large variations in temperature.

Change the batteries or wait until it has once
again reached the operating temperature
range.

Warning Function

When the display 3 indicates f and g send
the measuring tool to an authorized customer
service agent. The measuring tool is no longer
functional.

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Troubleshooting – Causes and Corrective Measures

Error Cause Corrective Measure

Measuring tool cannot be switched on Batteries empty Replace batteries
Measuring tool switched on but does not

react

Measuring tool

“Service required”

“Battery temperature has

fallen short of/exceeded
battery temperature range”

“Strong radio signal
detected”

has a fault

Maintenance and Service

!

WARNING

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

Keep the tool clean at all times.
Do not immerse the tool into water or

other fluids.
Wipe off debris using a moist and soft cloth. Do

not use any cleaning agents or solvents.
Do not attach any stickers or labels to the

sensor area 14 on the back of the detection
tool. Metal nameplates can affect the detection
results.

If the tool should fail despite the care taken in
manufacturing and testing procedures, repair
should be carried out by an authorized after-

Check the measuring tool
each time before use. In case

Remove and reinsert batteries

Send measuring tool to
customer service agent

Wait until the permitted
temperature range of the battery
has been reached or change the
batteries

If possible, remove the
interfering radio waves, e.g.
WLAN, UMTS, radar, transmitter
masts or microwaves.

sales service center 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 tool.

ENVIRONMENT PROTECTION

Recycle raw materials
& batteries instead of
disposing of waste. The unit,
accessories, packaging & used
batteries should be sorted
for environmentally friendly
recycling in accordance with the
latest regulations.

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LIMITED WARRANTY OF BOSCH LASER AND

MEASURING TOOL PRODUCTS

Robert Bosch Tool Corporation (“Seller”) warrants to the original purchaser only, that all Bosch
lasers and measuring tools will be free from defects in material or workmanship for a period of one
(1) year from date of purchase. Bosch will extend warranty coverage to two (2) years when you
register your product within eight (8) weeks after date of purchase. Product registration card must
be complete and mailed to Bosch (postmarked within eight weeks after date of purchase), or you
may register on-line. If you choose not to register your product, a one (1) year limited warranty will
apply to your product.

30 Day Money Back Refund or Replacement -

If you are not completely satisfied with the performance of your laser and measuring tools, for
any reason, you can return it to your Bosch dealer within 30 days of the date of purchase for a
full refund or replacement. To obtain this 30-Day Refund or Replacement, your return must be
accompanied by the original receipt for purchase of the laser or optical instrument product. A
maximum of 2 returns per customer will be permitted.

SELLER’S SOLE OBLIGATION AND YOUR EXCLUSIVE REMEDY under this Limited Warranty
and, to the extent permitted by law, any warranty or condition implied by law, shall be the repair
or replacement of parts, without charge, which are defective in material or workmanship and
which have not been misused, carelessly handled, or misrepaired by persons other than Seller
or Authorized Service Center. To make a claim under this Limited Warranty, you must return the
complete Bosch laser or measuring tool, transportation prepaid, to any BOSCH Factory Service
Center or Authorized Service Center. Please include a dated proof of purchase with your tool. For
locations of nearby service centers, please use our on-line service locator.

THIS WARRANTY PROGRAM DOES NOT APPLY TO TRIPODS AND RODS. Robert Bosch Tool
Corporation (“Seller”) warrants tripods and leveling rods for a period of one (1) year from date of
purchase.

THIS LIMITED WARRANTY DOES NOT APPLY TO OTHER ACCESSORY ITEMS AND
RELATED ITEMS. THESE ITEMS RECEIVE A 90 DAY LIMITED WARRANTY.

To make a claim under this Limited Warranty, you must return the complete product,
transportation prepaid. For details to make a claim under this Limited Warranty.

ANY IMPLIED WARRANTIES SHALL BE LIMITED IN DURATION TO ONE YEAR FROM DATE
OF PURCHASE. SOME STATES IN THE U.S., AND SOME CANADIAN PROVINCES DO NOT
ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE
LIMITATION MAY NOT APPLY TO YOU.

IN NO EVENT SHALL SELLER BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL
DAMAGES (INCLUDING BUT NOT LIMITED TO LIABILITY FOR LOSS OF PROFITS) ARISING
FROM THE SALE OR USE OF THIS PRODUCT. SOME STATES IN THE U.S., AND SOME
CANADIAN PROVINCES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF
INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION MAY NOT
APPLY TO YOU.

THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO
HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE IN THE U.S., OR PROVINCE
TO PROVINCE IN CANADA AND FROM COUNTRY TO COUNTRY.

THIS LIMITED WARRANTY APPLIES ONLY TO PRODUCTS SOLD WITHIN THE UNITED
STATES OF AMERICA, CANADA AND THE COMMONWEALTH OF PUERTO RICO. FOR
WARRANTY COVERAGE WITHIN OTHER COUNTRIES, CONTACT YOUR LOCAL BOSCH
DEALER OR IMPORTER.

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© Robert Bosch Tool Corporation

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2610039435 07/15 Printed in Malaysia

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