Bosch GRL 250 HV Professional Original Instructions Manual page 28

OBJ_BUCH-757-006.book Page 28 Wednesday, September 29, 2010 11:21 AM
28 | English
Operation
Starting Operation of the Rotational
Laser Level
Protect the measuring tool against mois-
ture and direct sun light.
Do not subject the measuring tool to ex-
treme temperatures or variations in tem-
perature. As an example, do not leave it in
vehicles for longer periods. In case of large
variations in temperature, allow the measur-
ing tool to adjust to the ambient temperature
before putting it into operation. In case of ex-
treme temperatures or variations in tempera-
ture, the accuracy of the measuring tool can
be impaired.
Avoid heavy impact to or dropping down of
the measuring tool. After severe exterior ef-
fects to the measuring tool, it is recommend-
ed to carry out an accuracy check (see "Lev-
elling Accuracy of the Rotational Laser
Level", page 30) each time before continuing
to work.
Setting Up the Measuring Tool
Horizontal
position
Vertical
position
Set up the measuring tool on a sturdy surface in
the horizontal or vertical position; mount it on a
tripod 26 or to the wall mount with alignment
unit 30.
Due to the high levelling accuracy, the measur-
ing tool reacts sensitively to ground vibrations
and position changes. Therefore, pay attention
that the position of the measuring tool is stable
in order to avoid operational interruptions due
to re-levelling.
2 610 A14 633 | (29.9.10)
Switching On and Off
Do not direct the laser beam at persons or
animals (especially not at their eye level),
and do not stare into the laser beam your-
self (not even from a distance). Immediately
after switching on, the measuring tool sends
out the vertical plumb beam 9 and the varia-
ble laser beam 6.
For switching on the measuring tool, press the
On/Off button 4. The indicators 1, 3 and 12 light
up briefly. The measuring tool immediately
starts the automatic levelling. During the level-
ling, the levelling indicator 3 lights up green and
the laser flashes in point operation.
The measuring tool is levelled in as soon as lev-
elling indicator 3 lights up green continuously
and the laser beam is steady. After the levelling
is completed, the measuring tool automatically
starts in rotational operation.
With the operating mode buttons 5 and 11, the
operating modes can already be specified dur-
ing levelling in (see "Operating Modes of the Ro-
tational Laser Level", page 29). In this case, the
measuring tool starts in the set operating mode
upon completion of levelling in.
To switch off the measuring tool, press the
On/Off button 4 again.
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.
To save the batteries, the measuring tool is au-
tomatically switched off when not within the
self-levelling range for more than 2 h or when
the shock warning is actuated for more than 2 h
(see "Automatic Levelling of the Rotational La-
ser Level", page 29). Reposition the measuring
tool and switch it on again.
Bosch Power Tools