Technical Data; Inserting/Replacing The Battery; Initial Operation - Bosch Professional GMS 120 Manual Original

OBJ_BUCH-1222-007.book Page 11 Monday, September 5, 2016 4:56 PM

Technical Data

Digital Detector
Article number
1)
Maximum scanning depth
– Ferrous metals
– Non-ferrous metals (copper)
– Live conductors 110–230 V
2)
(voltage applied)
– Wood
Automatic switch-off after approx.
Operating temperature
Storage temperature
Battery
Operating time, approx.
Weight according to
EPTA-Procedure 01:2014
Degree of protection
1) depending on operating mode, material and size of the objects, as
well as material and condition of the base material
2) less scanning depth for wires/conductors that are not "live"
 In terms of accuracy and scanning depth, the measurement
result can be inferior in case of unfavourable surface quality of
the base material.
Assembly

Inserting/Replacing the Battery

Alkali-manganese batteries are recommended for the meas-
uring 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
 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
 Protect the measuring tool against moisture and direct
sun light.
 Do not subject the measuring tool to extreme tempera-
tures or variations in temperature. In case of large var-
iations in temperature, allow the measuring tool to ad-
just to the ambient temperature before switching it on.
In case of extreme temperatures or variations in tempera-
ture, the accuracy of the measuring tool and the display in-
dication can be impaired.
Bosch Power Tools
 Use or operation of transmitting systems, such as
WLAN, UMTS, radar, transmitter masts or microwaves,
GMS 120
in the close proximity can influence the measuring
function.
3 601 K81 0..

Initial Operation

120 mm
Switching On and Off
80 mm
 Before switching the measuring tool on, make sure that
50 mm
the sensor area 12 is not moist. If required, dry the meas-
38 mm
uring tool using a soft cloth.
5 min
 If the measuring tool was subject to an extreme tem-
perature change, allow it to adjust to the ambient
–10 °C...+50 °C
temperature before switching on.
–20 °C...+70 °C
To switch on the measuring tool, press the On/Off button 5.
1 x 9 V 6LR61
To switch off the measuring tool, press the On/Off button 5
5 h
again.
When no button on the measuring tool is pressed for approx.
0.27 kg
5 minutes and when no objects are detected, the measuring
IP 54 (dust and splash
tool automatically switches off to save the battery.
water protected)
Switching the Display Illumination On/Off
The display illumination can be switched on/off with display-
illumination 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.
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 sur-
face 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 de-
tected, and move it in direction B. When the measuring tool
comes closer to an object, the amplitude in measuring indica-
tor i increases and ring 1 lights up yellow; when it is moved
away from the object, the amplitude decreases. Measuring in-
dicator i indicates the maximum 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.
 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.
English | 11
1 609 92A 270 | (5.9.16)