Operating Modes; Automatic Levelling; Working Advice - Bosch GLL 2-20 Professional Original Instructions Manual

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| English
To switch off the measuring tool, slide the On/Off switch 2
to the "Off" position. When switching off, the levelling unit
is locked.
u Do not leave the switched-on measuring tool
unattended and switch the measuring tool off after
use. Other persons could be blinded by the laser beam.
Indication
All three operating modes can be selected either with or without automatic levelling.

Automatic Levelling

Working with Automatic Levelling (see figure F –G)
When working with automatic levelling, the indicator for
working without automatic levelling 11 may not be lit. If
required, switch the automatic levelling on again by pressing
the "Lock" button 7 so that the indicator 11 goes out.
Position the measuring tool on a level and firm support,
attach it to the holder 12 or to the tripod 17.
After switching on, the levelling function automatically
compensates irregularities within the self-levelling range
of ±4°.
The levelling is finished as soon as the laser beams do not
move any more.
If the automatic levelling function is not possible, e.g.
because the surface on which the measuring tool stands
deviates by more than 4° from the horizontal plane, the
levelling warning indicator 9 lights up red and the laser
is automatically switched off. In this case, bring the
measuring tool to the level position and wait for the self-
levelling to take place. As soon as the measuring tool is
within the self-levelling range of ±4°, the levelling warning
indicator 9 goes out and the laser is switched on.
When not within the self-levelling range of ±4°, working with
automatic levelling is not possible, because it cannot be
assured that the laser lines run at a right angle to each other.
In case of ground vibrations or position changes during
operation, the measuring 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.
Working without Automatic Levelling (see figure E)
When working without automatic levelling, press the "Lock"
button 7. When the automatic levelling is switched off,
indicator 11 lights up red.
When the automatic levelling is switched off, the measuring
tool can be held by hand or placed on an inclined surface.
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Manual GLL 2-20.indd 16

Operating Modes

After switching on, the measuring tool is in cross-line
operating mode with automatic levelling.
To change the operating mode, press the "Mode" button 8
until the requested operating mode is indicated by the
corresponding illuminated operating-mode indication 10.
The following operating modes are available:
Operating Mode
Cross-line operation
(ver figuras AB y E): The measuring tool generates a horizontal laser plane
(360° rotating laser line) and avertical laser line.
Horizontal operation
(see figure C): The measuring tool generates a horizontal laser plane.
Vertical operation
(see figure D): The measuring tool generates a vertical laser line.
In cross-line operation, the two laser lines do not
necessarily run at a right angle to each other.

Working Advice

u Always use the centre of the laser line for marking.
The width of the laser line changes with the distance.
Working with the Tripod
A tripod 17 offers a stable, height-adjustable measuring
support.
Place the measuring tool via the tripod mount 3 onto the
1/4" male thread of the tripod 17 or a commercially
available camera tripod and screw the locking screw of the
tripod tight.
Adjust the tripod roughly before switching on the
measuring tool.
Fastening with the Universal Holder (Accessory)
(see figures H –K)
With the universal holder 12, you can fasten the measuring
tool, e.g., to vertical surfaces. The universal holder is also
suitable for use as a ground tripod and makes the height
adjustment of the measuring tool easier.
Fold the holding plate 14 of the universal holder 12 upward
(a) as shown in the figure, so that it engages in this position.
Lower the holding plate with adjustment knob 13 to the
desired height (b).
When using as a wall mount, fasten the universal holder
12 as vertical as possible to a wall with the holding plate
folded up.
Secure it safely against slipping off, e.g., with a fastening
screw (commercially available).
To use the universal holder as a table tripod, fold out the
base plate 15 until parallel to the holding plate (c).
Screw the 1/4" screw 16 of the wall mount into the tripod
mount 3 of the measuring tool.
Adjust the universal holder roughly before 12 switching on
the measuring tool.
Bosch Power Tools
17/04/15 16:18