Bosch GRL Professional 250 HV Original Instructions Manual page 15

OBJ_BUCH-1492-001.book Page 15 Friday, July 1, 2011 12:25 PM
Work Examples
Projecting/Checking Heights (see figure C)
Position the measuring tool in the horizontal position onto a
firm support or mount it onto a tripod 31 (accessory).
Working with tripod: Align the laser beam to the requested
height. Project or check the height at the target location.
Working without tripod: Determine the height difference be-
tween the laser beam and the height at the reference point
with the laser target plate 37. Project or check the measured
height difference at the target location.
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 37. 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.
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
Bosch Power Tools
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
plane with the reference point. For precise alignment with the
reference point, press button 22 (clockwise rotation) or but-
ton 23 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 op-
eration, or select point operation and manually rotate the ro-
tation head 10 to the target location.
Working with the Laser Receiver (see figure H)
Under unfavourable light conditions (bright environment,
direct 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 interfer-
ences, the measuring tool should always be set up in the cen-
tre 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 31. 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
English | 15
green red
2x/s
2x/s
1 619 929 J23 | (1.7.11)