Working Advice - Bosch GLL 2-50 Professional Notice Originale

OBJ_BUCH-817-007.book Page 16 Monday, July 4, 2016 6:35 PM
16 | English
Checking the Levelling 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.
– Position the measuring tool on a firm, level surface (not on
a tripod) 2.5 m away from the door opening. Allow the
measuring tool to level in while in cross-line operation
mode, and direct the laser beams at the door opening.
– Mark the centre of the vertical laser line at the floor of the
door opening (point I), at a distance of 5 m beyond the
other side of the door opening (point II) and at the upper
edge of the door opening (point III).
– Position the measuring tool on the other side of the door
opening directly behind point II. Allow the measuring tool
to level in and align the vertical laser line in such a manner
that its centre runs exactly through points I and II.
– The difference d between point III and the centre of the
laser line at the upper edge of the door opening results in
the actual deviation of the measuring tool from the vertical
plane.
– Measure the height of the door opening.
The maximum permitted deviation d
lows:
d = double height of the door opening x 0.3 mm/m
max
Example: With a door opening height of 2 metres, the maxi-
mum permitted deviation is
d = 2 x 2 m x 0.3 mm/m = 1.2 mm. Thus, the marks must
max
not be more than 1.2 mm apart.
1 609 92A 27R | (4.7.16)

Working Advice

 Always use the centre of the laser line for marking. The
width of the laser line changes with the distance.
Working with the Alignment Plate
With the alignment plate 12, the measuring tool can be
aligned by a reference line or the vertical laser line can be indi-
cated at an angle of 45° or 90° to a reference line.
Position the measuring tool via the tripod mount 6 onto the
pin 16 of the alignment plate. Position it in such a manner on
the alignment plate that the vertical laser line (depending on
the requested angle) runs centrally through the alignment aid
13, 14 or 15.
Align the alignment plate 12 with the corresponding align-
ment aids 13, 14 or 15 to the desired reference line.
Working with the Measuring Plate (Accessory)
(see figures E–F)
With the measuring plate 20, it is possible to project the laser
mark onto the floor or the laser height onto a wall.
With the zero field and the scale, the offset or drop to the re-
quired height can be measured and projected at another loca-
tion. This eliminates the necessity of precisely adjusting the
measuring tool to the height to be projected.
The measuring plate 20 has a reflective coating that enhances
the visibility of the laser beam at greater distances or in
intense sunlight. The brightness intensification can be seen
only when viewing, parallel to the laser beam, onto the meas-
uring plate.
Working with the Tripod (Accessory)
A tripod offers a stable, height-adjustable measuring support.
Place the measuring tool via the tripod mount 6 onto the 1/4"
male thread of the tripod and screw the locking screw of the
tripod tight.
Working with the Laser Receiver (Accessory)
(see figure G)
Under unfavourable light conditions (bright environment, di-
rect sunlight) and for larger distances, use the laser receiver
for improved finding of the laser lines 21. When working with
the laser receiver, switch the pulse function on (see "Pulse
Function", page 14).
Laser Viewing Glasses (Accessory)
The laser viewing glasses filter out the ambient light. This
makes the red light of the laser appear brighter for the eyes.
 Do not use the laser viewing glasses as safety goggles.
The laser viewing glasses are used for improved visualisa-
tion of the laser beam, but they do not protect against laser
radiation.
 Do not use the laser viewing glasses as sun glasses or in
traffic. The laser viewing glasses do not afford complete
UV protection and reduce colour perception.
is calculated as fol-
max
Work Examples (see figures H–K)
Laying Flooring Plates at a 45° Angle (see figure J)
Position the measuring tool via the tripod mount 6 onto the
pin 16 of the alignment plate. Position it in such a manner on
the centred protrusion of the alignment plate 12 that the ver-
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