Working Advice - Bosch GMS 100 M Professional Originalbetriebsanleitung

OBJ_BUCH-1418-004.book Page 11 Monday, September 5, 2016 3:27 PM
To switch on the measuring tool, press the On/Off button 4.
To switch off the measuring tool, press the On/Off button 4
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
When the measuring tool is switched on, the audio signal can
be switched on or off by pressing the On/Off button 4 for a few
seconds. When the audio signal is switched off, indication a
appears on the display.
Method of Operation (see figures A–B)
The measuring tool checks the base material of sensor area 6
in measurement direction z 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 sur-
face applying slight pressure, without lifting it off or changing
the pressure. During measurement, the contact pads 5 must
always have contact to the surface.
Measuring Procedure
After switching on, the illuminated ring 1 lights up green.
Position the measuring tool against the surface being detect-
ed and move it toward the x- and y-axis. When the measuring
tool comes closer to an object, the amplitude in the main scale
h increases and ring 1 lights up yellow; when it is moved away
from the object, the amplitude decreases. The main scale h
indicates the maximal amplitude above 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.
 Wide objects are not indicated by the illuminated ring
or the audio signal throughout their complete width.
As soon as the measuring tool has localised an object below
the centre of the sensor, the fine scale i is activated.
To localise the object more precisely, move the measuring
tool repeatedly (3x) back and forth over the object.
The fine scale i indicates a maximum amplitude when the ob-
ject is positioned precisely below the centre of the sensor, in-
dependent thereof how many bars are displayed in the main
scale h.
When very small or deeply embedded objects are being
sought and main scale h reacts only slightly, move the meas-
uring tool repeatedly over the object in horizontal (x-axis)
and vertical (y-axis) direction. Observe the amplitude of fine
scale i.
 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 the
illuminated ring 1 lit green).
Bosch Power Tools
Metal
When the detected metal object is of magnetic metal (e.g.
iron), the symbol d is indicated on display 3. For non-magnet-
ic metals, the symbol c 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 and fine scale
i indicates a high amplitude).
Note: For reinforcement steel mesh and steel in the examined
base material, an amplitude is indicated over the complete
surface of the main scale h. For reinforcement steel mesh, it
is typical that the symbol d for magnetic metal is indicated on
the display directly above the iron rods, whereas between the
iron rods, the symbol c for non-magnetic metal will appear.
Power Cable
When a "live" conductor is detected, indication e appears on
the display 3. Move the measuring tool repeatedly over the ar-
ea to localise the "live" conductor more precisely. After mov-
ing 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 rapidly flashes red and the
audio signal beeps swiftly.
Notes:
– "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" con-
ductors 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.
This does not apply for stranded conductors (contrary to
solid conductors or cable).
– Static electricity can lead to electric lines being indicated
inaccurately, e.g. over a large area, or not at all. To improve
the indication, place your free hand flat on the wall next to
the measuring tool, in order to remove the static electri-
city.

Working Advice

 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 ma-
terials, foil-laminated insulation materials or conduc-
tive wallpaper or tiles. Therefore, also observe other in-
formation 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 meas-
urement as usual. Once you have found the boundaries or the
centre of an object, mark the sought location through the
marking hole 2.
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