Operating Modes - Bosch Professional GMS 120 Manual Original

OBJ_BUCH-1222-007.book Page 12 Monday, September 5, 2016 4:56 PM
12 | English
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 "CENTER " k indication, which will then al-
low for precise detection.
 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).

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 max-
imal 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.
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 sig-
nals 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 ob-
jects, the indication c for non-metal objects is indicated in dis-
play 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 differ-
ent location on the base material.
When the illuminated ring 1 does not signal operational read-
iness when positioning the measuring tool on the base mate-
rial being detected, the measuring tool cannot properly de-
tect the base material.
1 609 92A 270 | (5.9.16)
– 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 sur-
face, 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 measur-
ing tool with a dry, soft cloth and restart the measuring pro-
cedure.
Metal
The operating mode "Metal" is suitable for detecting magnet-
ic 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-magnet-
ic 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 indi-
cated on the display directly above the iron rods, whereas be-
tween the iron rods, the symbol d for non-magnetic metal will
appear.
Power Cable
The operating mode "Power cable" is suitable only for de-
tecting "live" conductors (110–230 V).
Press button 8 to activate the operating mode "Power ca-
ble". 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 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 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" 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
in the operation mode "Metal". This does not apply for
stranded conductors (contrary to solid conductors or ca-
ble).
Bosch Power Tools