Automatic Levelling - Bosch GCL Professional 2-50 C Manual Original

OBJ_BUCH-2870-004.book Page 23 Monday, February 27, 2017 3:47 PM
 Do not point the laser beam at persons or animals and
do not look into the laser beam yourself, not even from
a large distance.
To switch off the measuring tool, slide the On/Off switch 18
to position " ".
The pendulum unit is locked when the tool is switched off.
 Do not leave the switched-on measuring tool unattend-
ed and switch the measuring tool off after use. Other
persons could be blinded by the laser beam.
When exceeding the maximum permitted operating tempera-
ture of 50 °C, the measuring tool switches off to protect the
laser diode. After cooling down, the measuring tool is ready
for operation and can be switched on again.
Automatic Shut-off
When no button on the measuring tool is pressed for approx.
120 minutes, the measuring tool automatically switches off
to save the batteries.
To switch the measuring tool back on after automatic shut-off,
you can either slide the On/Off switch 18 to position "
first and then switch the measuring tool back on, or press but-
ton 8.
Temporarily Deactivating Automatic Shut-Off
To deactivate automatic shut-off, hold down button 8 for at
least 3 s with the measuring tool switched on. If automatic
shut-off is deactivated, the laser lines will flash briefly as con-
firmation.
Note: If the operating temperature exceeds 45°C, automatic
shut-off can no longer be deactivated.
After the next time the measuring tool is switched off and on,
the automatic shut-off will be activated again.
Setting the operating mode (see figures B1–F1)
The measuring tool has several operating modes between
which you can switch at any time:
– Cross-line and point operation: The measuring tool gen-
erates a horizontal and a vertical laser line facing front-
ward, a vertical laser point facing upward and a vertical la-
ser point facing downward.
The laser lines cross at a 90° angle.
– Horizontal line operation: The measuring tool generates
a horizontal laser line facing frontward.
– Vertical line operation: The measuring tool generates a
vertical laser line facing frontward.
If the measuring tool is positioned in the room, the vertical
laser line is displayed on the ceiling beyond the upper laser
point.
If the measuring tool is positioned directly against a wall,
the vertical laser line generates an almost completely all-
round laser line (360° line).
– Point operation: The measuring tool generates a vertical
laser point facing upward and a vertical laser point facing
downward.
Use button 8 to switch between the individual operating
modes, see table on page 24.
All modes except for point operation can be selected both
with and without automatic levelling.
Bosch Power Tools
Receiver mode
Receiver mode must be activated to work with the laser re-
ceiver 33, –regardless of which operating mode is
selected–.
In receiver mode the laser lines flash at very high frequency,
enabling them to be detected by the laser receiver 33.
To switch on receiver mode, press button 6. Indicator 7 will
light up green.
When receiver mode is switched on, the laser lines are less
visible to the human eye. For this reason, switch receiver
mode off by pressing button 6 again to work without a laser re-
ceiver. Indicator 7 will extinguish.

Automatic Levelling

Working with Automatic Levelling (see figures B1–E1)
After switching on, the levelling function automatically com-
pensates irregularities within the self-levelling range of ±4°.
The measuring tool is levelled in as soon as the laser lines no
longer flash.
"
If the automatic levelling function is not possible, e.g. be-
cause the surface on which the measuring tool stands devi-
ates by more than 4° from the horizontal plane, the laser
beams flash. In this case, bring the measuring tool to the level
position and wait for the self-levelling to take place.
In case of ground vibrations or position changes during oper-
ation, the measuring tool is automatically levelled in again. To
avoid errors by moving the measuring tool, check the position
of the laser beams with regard to the reference points upon
re-levelling.
Position the measuring tool on a level, firm support or attach
it to the rotating mount 22.
For work with automatic levelling, slide the On/Off switch 18
to position " ".
If the measuring tool is outside of the self-levelling range, the
laser lines and/or points will flash quickly.
If you deactivate automatic levelling (On/Off switch 18 to po-
sition " "), the measuring tool will switch to cross-line
operation.
Working without Automatic Levelling (see figure F1)
When automatic levelling is switched off, you can hold the
measuring tool freely in your hand or place it on an inclined
surface. The laser beams no longer necessarily run vertical to
each other.
For work without automatic levelling, slide the On/Off switch
18 to position " ".
The laser lines will flash slowly.
If you activate automatic levelling (On/Off switch 18 to posi-
tion " "), the measuring tool will switch to cross-line
operation with point operation.
English | 23
1 609 92A 2U5 | (27.2.17)