Automatic Levelling - Bosch Professional GLL 5-50 X Notice Originale

OBJ_BUCH-2753-003.book Page 8 Friday, June 17, 2016 4:53 PM
8 | English
Deactivating the Automatic Shut-off
The measuring tool automatically switches itself off after
30 minutes of operation. To deactivate the automatic shut-
off, hold down either the vertical mode button 18 or the hori-
zontal mode button 19 for 3 seconds when switching on the
measuring tool. The laser lines will flash briefly after 3 sec-
onds if the automatic shut-off is deactivated.
 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.
To activate the automatic shut-off, switch the measuring tool
off and on again (without holding down a button).
Operation Modes (see figures B–D)
The horizontal and vertical modes can be switched on and off
independently of each other. All operation modes can be used
both with and without automatic levelling.
Horizontal operation
After it has been switched on, the measuring tool is in horizon-
tal mode and emits a horizontal laser line forwards.
To switch the horizontal laser line off or on, press the horizon-
tal mode 19 button.
Vertical mode and plumb point
The measuring tool has multiple vertical operation modes:
– vertical laser line forwards
– vertical laser line forwards and to the left-hand side
– vertical laser line forwards and backwards
– vertical laser lines to all four sides
A plumb point is additionally projected downwards in all ver-
tical operation modes.
To switch the vertical mode on/off or to change the vertical
operation mode, press the vertical mode 18 button repeated-
ly until the required operation mode is reached.
If the measuring tool is mounted on the rotating platform 12,
you can precisely align the vertical laser lines to reference
points using the fine adjustment knob 11.
Pulse Function
When working with the laser receiver 25, the pulse function
must be activated, – independent of the selected operating
mode.
In pulse function, the laser lines flash at very high frequency
and thus become detectable by the laser receiver 25.
To switch on the pulse function, press button 17. When the
pulse function is switched on, the pulse-function indicator 15
lights up red.
When the pulse function is switched on, the visibility of the la-
ser lines is reduced for the human eye. Therefore, shut off the
pulse function by pushing button 17 again when working
without laser receiver. When the pulse function is switched
off, the pulse-function indicator 15 is deactivated.
1 609 92A 302 | (17.6.16)

Automatic Levelling

Working with Automatic Levelling
Position the measuring tool on a level, firm support or attach
it to the rotating platform 12.
When working with automatic levelling, push the On/Off
switch 7 to the " On" position.
After switching on, the levelling function automatically com-
pensates irregularities within the self-levelling range of ±3°.
The levelling is finished as soon as the laser beams do not
move any more.
If automatic levelling is not possible, e.g. because the surface
on which the measuring tool stands deviates by more than 3°
from the horizontal plane, the laser lines will begin to flash
quickly.
Set up the measuring tool in a level position and wait for the
self-levelling to take place. As soon as the measuring tool is
within the self-levelling range of ±3°, the laser lines will light
up continuously.
In case of ground vibrations or position changes during oper-
ation, the measuring tool is automatically levelled again. Upon
re-levelling, check the position of the laser lines with regard to
the reference points to avoid errors.
Working without Automatic Levelling
For work without automatic levelling, slide the on/off switch 7
to the " On" position. When automatic levelling is switched
off, the indicator 14 lights up red and the laser lines continu-
ously flash slowly.
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 lines no longer necessarily run perpendicu-
lar to each other.
Levelling Accuracy
Influences on Accuracy
The ambient temperature has the greatest influence. Espe-
cially temperature differences occurring from the ground up-
ward can divert the laser beam.
As thermal fluctuation is largest close to the ground, the
measuring tool, if possible, should be mounted on the tripod
21 and placed in the centre of the working area.
In addition to external influences, device-specific influences
(e.g. falls or heavy impacts) can also lead to deviations. For
this reason, check the levelling accuracy each time before be-
ginning work.
First check the height accuracy and levelling accuracy of the
horizontal laser line, then the levelling accuracy of the vertical
laser lines.
Should the measuring tool exceed the maximum deviation
during one of the tests, please have it repaired by a Bosch af-
ter-sales service.
Bosch Power Tools