Bosch GLL 2-50 Professional - Manual (Page 21)

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Bosch Power Tools 1 609 929 S02 | (19.3.09)
– Without turning the measuring tool, position
it close to wall B. Switch the measuring tool
on and allow it to level in.
– Align the height of the measuring tool (using
a tripod or by underlaying, if required) in
such a manner that the cross point of the la-
ser lines is projected against the previously
marked point II on the wall B.
– Without changing the height, turn around the
measuring tool by 180°. Direct it against the
wall A in such a manner that the vertical laser
line runs through the already marked point I.
Allow the measuring tool to level in and mark
the cross point of the laser lines on the wall
A (point III).
– The difference d of both marked points I and
III on wall A indicates the actual height devi-
ation of the measuring tool.
The maximum permitted deviation d
max
is cal-
culated as follows:
d
max
= double distance of the walls x 0.3 mm/m
Example: With a 5 metre distance between the
walls, the maximum deviation must not exceed
d
max
= 2 x 5 m x 0.3 mm/m = 3 mm. Thus, the
marks must not be more than 3 mm apart.
Checking the Levelling Accuracy
of the Horizontal Line
For the check, a free surface of approx.
5 x 5 metres is required.
– Set up the measuring tool on a firm, level sur-
face between both walls A and B. Allow the
measuring tool to level in while in horizontal
operation.
– At a distance of 2.5 metres from the measur-
ing tool, mark the centre of the laser line
(point I on wall A and point II on wall B) on
both walls.
– Set up the measuring tool 5 metres away
turned by 180° and allow it to level in.
– Align the height of the measuring tool (using a
tripod or by underlaying, if required) in such a
manner that the centre of the laser line is pro-
jected exactly against the previously marked
point II on wall B.
A B
d
180˚
A B
2,5 m
,0 m
5, 5
A
B
d
2,5 m
A
B
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