Bosch GLL2-50 Consignes De Fonctionnement/Sécurité page 10

If the automatic levelling function is not
possible, e.g. because the surface on which
the tool stands deviates by more than 4°
from the horizontal plane, the laser beams
flash. In this case, bring the tool to the level
position and wait for the self-levelling to
take place.
In case of ground vibrations or position
changes during operation, the tool is
automatically levelled in again. To avoid
errors, check the position of the horizontal
and vertical laser line with regard to the
reference points upon re-levelling.
Influences on Accuracy
The ambient temperature has the greatest
influence. Especially temperature differences
occurring from the ground upward can divert
the laser beam.
Because the largest difference in
temperature layers is close to the ground, the
tool should always be mounted on a tripod
when measuring distances exceeding 65 ft. If
possible, also set up the tool in the centre of
the work area.
Apart from exterior influences, device specific
influences (such as heavy impact or falling
down) can lead to deviations. Therefore,
check the accuracy of the tool each time
before starting your work.
First, check both the height as well as the
leveling accuracy of the horizontal laser line,
then the leveling accuracy of the vertical
laser line.
Should the tool exceed the maximum
deviation during one of the tests, please
have it repaired by a Bosch
after-sales service center.
Checking the Height Accuracy of the
Horizontal Line
For this check, a free measuring distance of
approximately 26 feet on a firm surface
between two walls A and B is required.
– Mount the tool onto a tripod or place it on a
firm and level surface close to wall A.
Switch on the tool. Select cross-line
operation with automatic leveling.
Lock Mode - Working without Automatic
Levelling (see figure D)
For work without automatic levelling, push
the On/Off switch 7 to the "
When the automatic levelling is switched off,
the laser line flash continuously.
When the automatic levelling is switched off,
the tool can be held by hand or placed on an
inclined surface.
Working Advice
• Always use the center of the laser line
for marking. The width of the laser line
changes with the distance.
Leveling Accuracy
– Direct the laser against the close wall A
and allow the tool to level in. Mark the
center of the point where the laser lines
cross each other on the wall (point I).
– Turn the tool by 180°, allow it to level in
and mark the cross point of the laser lines
on the opposite wall B (point II).
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A
26 ft
A
180˚
A
on" position.
B
B
B