Bosch Professional GRL 250 HV Original Instructions Manual page 25

Position the measuring tool on a stable surface in the hori-
zontal or vertical position, mount it on the tripod (38) or on
the wall mount (42) with the alignment unit.
Due to its high levelling accuracy, the measuring tool is very
sensitive to knocks and vibrations and changes in position.
Take care, therefore, that the measuring tool is stable to
avoid interruptions to the operation caused by relevelling.
Switching On and Off
To switch on the measuring tool, press the on/off
button (4). All indicators light up briefly. The measuring tool
emits the variable laser beam (6) and the upwards plumb
point (9) from the outlet apertures (8).
Do not direct the laser beam at persons or animals and
u
do not stare into the laser beam yourself (even from a
distance).
The measuring tool immediately starts automatic levelling.
During levelling, the status indicator (3) flashes green, the
laser does not rotate and flashes.
The measuring tool is levelled in as soon as the status
indicator (3) lights up green continuously and the laser lights
up continuously. After levelling is completed, the measuring
tool automatically starts in rotational operation.
Never leave the measuring tool unattended when
u
switched on, and ensure the measuring tool is
switched off after use. Others may be blinded by the
laser beam.
You can already set the operating mode during levelling with
the rotational operation button (5) or the line operation
button (11). In this case, the measuring tool starts in the set
operating mode after levelling is completed.
To switch off the measuring tool, press the on/off
button (4) again.
To save the non-rechargeable/rechargeable batteries, the
measuring tool is automatically switched off when not within
the self-levelling range for more than 2 hours or when the
shock warning is actuated for more than 2 hours. Reposition
the measuring tool and switch on again.
Operating Modes
Operating Modes Overview
All three operating modes are possible with the measuring
tool in horizontal and vertical position.
Rotational operation
Rotational operation is especially recom-
mended when using the laser receiver. It
is possible to select between different ro-
tational speeds.
Bosch Power Tools
Line operation
In this operating mode, the variable laser
beam moves within a defined aperture
angle. This increases the visibility of the
laser beam in comparison to rotational
operation. You can select between differ-
ent aperture angles.
Point operation
In this operating mode, the best visibility
of the variable laser beam can be
reached. For example, it is used to easily
project heights or to check building lines.
Line and point operation are not suitable for use with the
laser receiver (36).
Rotational Operation
Each time after switching on, the measuring tool is in rota-
tional operation mode with standard rotational speed
−1
(300 min ).
To switch from line operation to rotational operation, press
the rotational operation button (5) or the rotational opera-
tion button (26) on the remote control.
To change the rotational speed, press the rotational opera-
tion button (5) or rotational operation button (26) on the re-
mote control until the required speed is reached.
When working with the laser receiver, the highest rotational
speed should be set. When not working with the laser re-
ceiver, reduce the rotational speed for improved visibility of
the laser beam and use the laser googles (46).
Line Operation/Point Operation
To switch to line or point operation, press the line operation
button (11) or the line operation button (27) on the remote
control.
The measuring tool switches to line operation with the smal-
lest aperture angle.
To change the aperture angle, press the line operation
button (11) or the line operation button (27) on the remote
control until the required operating mode is achieved. The
aperture angle is gradually increased each time it is pressed;
at the same time, the rotational speed is increased with each
setting.
After the largest aperture angle, the measuring tool switches
to point operation after brief post-pulsation. Pressing the
line operation button (11) again takes you back to line oper-
ation with the smallest aperture angle.
Note: Due to inertia, it is possible for the laser to slightly
move beyond the end point of the laser line.
English | 25
1 609 92A 5S1 | (09.09.2020)