Bosch Professional D-tect 120 Original Instructions Manual page 15

Always replace all the batteries at the same time. Only use
batteries from the same manufacturer and which have the
same capacity.
Take the batteries out of the measuring tool when you
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are not using it for a prolonged period of time. The bat-
teries can corrode and self-discharge during prolonged
storage in the measuring tool.
Starting Operation
Switching on/off
Before switching on the measuring tool, ensure that
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the sensor area (14) is dry. If necessary, use a cloth to
dry the measuring tool.
If the measuring tool has been exposed to a significant
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change in temperature, leave it to adjust to the ambi-
ent temperature before switching it on.
To switch on the measuring tool, press the on/off
button (8).
To switch off the measuring tool, press the on/off
button (8) again.
If no button on the measuring tool is pressed for approx.
5 minutes, the measuring tool will automatically switch itself
off to preserve battery life.
Check the measuring tool before each use. Safe operation
cannot be guaranteed in the following circumstances:
– The measuring tool has visible damage or there are loose
components inside the measuring tool.
– The measuring indicator (e) constantly deflects, even
when holding the measuring tool in the air.
– The measuring indicator (e) does not deflect at all, even
when holding a finger in the sensor area.
– None of the operating mode buttons light up.
Switching audio signal on/off
The audio signal can be switched on/off with the audio signal
button (4). When the audio signal is switched off, the audio
signal indicator (i) appears on the display.
Operating Modes
Once it has been switched on, the measuring tool defaults to
the universal operating mode.
To change the operating mode, press the button for the re-
quired operating mode (button for universal operating
mode (9), button for concrete operating mode (3) or button
for drywall operating mode (10)). The selected operating
mode is indicated by the illuminated button.
By selecting the operating mode, you can adjust the measur-
ing tool to different wall materials and, if required, prevent
the detection of unwanted objects.
If the wall material is not known, you should begin with the
universal operating mode.
Universal operating mode
The universal operating mode is suitable for
most applications in masonry. Metal objects,
water-filled plastic pipes, electrical lines and
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cables can be detected. Hollow spaces in brick-
work or empty plastic pipes with a diameter of
less than 2 cm remain potentially undetectable.
The maximum measuring depth is 6 cm.
Concrete operating mode
The concrete operating mode is particularly
suitable for applications in reinforced concrete.
Rebar, metal pipes, water-filled plastic pipes,
electrical lines and cables can be detected. The
maximum measuring depth is 12 cm.
Drywall operating mode
The drywall operating mode is suitable for de-
tecting timber joists, metal supports, electrical
lines and cables in drywalls (wood, plaster-
board, etc.). Water-filled plastic pipes can also
be detected. Empty plastic pipes normally can-
not be detected. The maximum measuring
depth is 6 cm.
How it works (see figure D)
The measuring tool checks the base material of the sensor
area (14) in the measurement direction A up to the max-
imum detection depth. Objects that are different from the
material of the wall are detected.
Always move the measuring tool over the base material ap-
plying light pressure, without lifting it off or changing the
pressure.
The measuring tool can be moved in any direction B.
Measuring process
Position the measuring tool on/against the surface being in-
spected.
If there is an object below the measuring tool when it is set
down, the indicator light (12) lights up red if there is suffi-
cient signal strength, the measuring indicator (e) deflects
and an audio signal sounds.
If no object is detected when the measuring tool is set down,
the proceed indicator (b) is displayed and the indicator
light (12) lights up yellow. Move the measuring tool over the
surface without lifting it off, until the proceed indicator dis-
appears.
If no object is detected below the measuring tool, the indic-
ator light (12) lights up green.
When the measuring tool approaches an object, the deflec-
tion in the measuring indicator (e) increases, the indicator
light (12) lights up red and an audio signal sounds. When it
moves away from the object, the deflection in the measuring
indicator decreases.
For small or deep-lying objects, the indicator light (12) can
light up yellow without the audio signal sounding.
Wider objects in the base material can be identified by a con-
tinuous high deflection of the measuring indicator (e). The
indicator light (12) lights up red.
Before drilling, sawing or routing into walls, refer to
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other sources of information to ensure that you elim-
English | 15
1 609 92A 4X7 | (24.02.2021)