Overview Of Indications; Maintenance And Service; Maintenance And Cleaning - Bosch Professional GRL 250 HV Original Instructions Manual

OBJ_BUCH-757-007.book Page 27 Tuesday, June 21, 2011 10:16 AM
Parallel Alignment of a Plumb Beam/Projecting Right
Angles (see figure D)
When right angles are to be projected or when partitions are
to be aligned, the plumb beam 9 must be aligned parallel,
meaning at the same distance to a reference line (e.g. a wall).
For this, set up the measuring tool in the vertical position and
position it in such a manner that the plumb beam runs approx-
imately parallel to the reference line.
For exact positioning, measure the clearance between plumb
beam and reference line directly on the measuring tool with
help of the laser target plate 43. Measure the clearance be-
tween plumb beam and reference line again as far away as
possible from the measuring tool. Align the plumb beam in
such a manner that it has the same clearance to the reference
line as when measured directly at the measuring tool.
The right angle to the plumb beam 9 is indicated by the varia-
ble laser beam 6.
Indicating a Plumb Line/Vertical Plane (see figure E)
To indicate a plumb line or a vertical plane, set up the measur-
ing tool in the vertical position. When the vertical plane is sup-
posed to run at a right angle to a reference line (e.g. a wall),
then align the plumb beam 9 with this reference line.
The plumb line is indicated by the variable laser beam 6.
Turning the Rotational Plane when in the Vertical Position
(see figure F)
To align the vertical laser line or the rotational plane against a
reference point on a wall, set up the measuring tool in the ver-
tical position, and roughly align the laser line or the rotational

Overview of Indications

Switching on the measuring tool (1 s self-check)
Levelling in or re-levelling
Measuring tool levelled in/ready for operation
Self-levelling range exceeded
Shock-warning function activated
Shock warning actuated
Battery voltage for ≤2 h operation
Battery empty

Maintenance and Service

Maintenance and Cleaning

Keep the rotational laser level, battery charger and remote
control clean at all times.
Do not immerse the rotational laser level, battery charger and
remote control into water or other fluids.
Bosch Power Tools
plane with the reference point. For precise alignment with the
reference point, press button 28 (clockwise rotation) or but-
ton 29 on the remote control (anticlockwise rotation).
Working without Laser Receiver (see figure G)
Under favourable light conditions (dark environment) and for
short distances, it is possible to work without the laser receiv-
er. For better visibility of the laser beam, either select line
operation, or select point operation and manually rotate the
rotation head 10 to the target location.
Working with the Laser Receiver (see figure H)
Under unfavourable light conditions (bright environment, di-
rect sunlight) and for larger distances, use the laser receiver
for improved finding of the laser beam. When working with
the laser receiver, select rotational operation with the highest
rotational speed.
Measuring Over Long Distances (see figure I)
When measuring over long distances, the laser receiver must
be used to find the laser beam. In order to reduce interferenc-
es, the measuring tool should always be set up in the centre of
the work surface and on a tripod.
Working Outdoors (see figure J)
The laser receiver should always be used when working out-
doors.
When working on unstable ground, mount the measuring tool
onto the tripod 37. Activate the shock-warning function in or-
der to avoid faulty measurements in case of ground vibrations
or shock to the measuring tool.
green red
2x/s 2x/s
2x/s
2x/s
* for line and rotational operation
2x/s Flashing frequency (twice per second)
Continuous operation
Function stopped
Wipe off debris using a moist and soft cloth. Do not use any
cleaning agents or solvents.
Particularly clean the surfaces at the outlet opening of the ro-
tational laser level regularly and pay attention for any lint.
If the rotational laser level, battery charger or remote control
should fail despite the care taken in manufacture and testing,
repair should be carried out by an authorised customer servic-
English | 27
green red
2x/s
2x/s
1 619 929 J21 | (21.6.11)