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BM 2610A16273 07-13_BM 2610A16273 07-13 7/30/13 2:02 PM Page 18
A
– Set up the laser tool 5 metres away turned by 180° and allow it to level
in.
– Align the height of the laser tool (using a tripod or by underlaying, if
required) in such a manner that the centre of the laser line is projected
exactly against the previously marked point II on wall B.
– Mark the centre of the laser line as point III (vertically above or below
point I) on the wall A.
– The difference d of both marked points I and III on wall A indicates the
actual deviation of the laser tool from the level plane.
The maximum permitted deviation d
d
= double distance of the walls x 0.3 mm/m
max
Example: With a 5 metre distance between the walls, the maximum
deviation must not exceed.
d
= 2x 5 m x 0.3mm/m=3mm. Thus, the marks must not be more than
max
3 mm apart.
Checking the Leveling Accuracy of the Vertical Line
For this check, a door opening is required with at least 2.5 m of space (on
a firm surface) to each side of the door.
B
is calculated as follows:
max
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