Initial Operation; Operating Modes; Automatic Levelling - Bosch GCL 25 Professional Originalbetriebsanleitung

OBJ_BUCH-1546-003.book Page 13 Wednesday, May 14, 2014 4:32 PM
When the batteries are low, the battery low indicator 3 flashes
red. Additionally, the laser beams flash for approx. 5 s every
10 minutes. When the flashing initially begins, the measuring
tool can be operated for approx. 1 more hour. When the
batteries become empty, the laser beams flash one more time
directly prior to the automatic shut-off.
Always replace all batteries at the same time. Only use batter-
ies from one brand and with the identical capacity.
 Remove the batteries from the measuring tool when
not using it for extended periods. When storing for
extended periods, the batteries can corrode and self-
discharge.
Operation

Initial Operation

 Protect the measuring tool against moisture and direct
sun light.
 Do not subject the measuring tool to extreme tempera-
tures or variations in temperature. As an example, do
not leave it in vehicles for a long time. In case of large vari-
ations in temperature, allow the measuring tool to adjust to
the ambient temperature before putting it into operation.
In case of extreme temperatures or variations in tempera-
ture, the accuracy of the measuring tool can be impaired.
 Avoid heavy impact to or falling down of the measuring
tool. Damage to the measuring tool can impair its accura-
cy. After heavy impact or shock, compare the laser lines or
plumb beams with a known horizontal or vertical reference
line or with already checked plumb points.
 Switch the measuring tool off during transport. When
switching off, the levelling unit, which can be damaged in
case of intense movement, is locked.
Switching On and Off
To switch on the measuring tool, slide the On/Off switch 4 to
the " on" position (when working without automatic level-
ling) or to the " on" position (when working with auto-
matic levelling). Immediately after switching on, the measur-
ing tool sends laser beams out of the exit openings 1.
 Do not point the laser beam at persons or animals and
do not look into the laser beam yourself, not even from
a large distance.
To switch off the measuring tool, slide the On/Off switch 4 to
the "off" position. When switching off, the levelling unit is
locked.
Deactivating the Automatic Shut-off
When no button on the measuring tool is pressed for approx.
30 minutes, the measuring tool automatically switches off to
save the batteries.
To switch on the measuring tool after automatic shut-off, ei-
ther slide the On/Off switch 4 to the "off" position and then
switch the measuring tool on again or press the operating
mode button 2 once.
To deactivate the automatic shut-off, keep the operating
mode button 2 pressed for at least 3 s (while the measuring
Bosch Power Tools
tool is switched on). Deactivation of the automatic shut-off is
confirmed by brief flashing of the laser beams.
 Do not leave the switched-on measuring tool unattend-
ed and switch the measuring tool off after use. Other
persons could be blinded by the laser beam.
To activate the automatic shut-off, switch the measuring tool
off and then on again.

Operating Modes

The measuring tool has several operating modes between
which you can switch at any time:
– Cross and point-line operation: The measuring tool gener-
ates a horizontal and a vertical laser line facing toward the
front as well as a vertical point beam each facing upward
and downward, and a horizontal point beam each facing
toward the front and to both sides.
– 5-point operation: The measuring tool generates a vertical
point beam each facing upward and downward, as well as
a horizontal point beam each facing toward the front and to
both sides.
– Horizontal line operation: The measuring tool generates a
horizontal laser line facing frontward.
– Vertical line operation: The measuring tool generates a ver-
tical laser line facing frontward.
All point beams run at a 90° angle to each other; the laser lines
also cross each other at a 90° angle.
After switching on, the measuring tool is in cross-line and
point-line operation. To change the operating mode, press
the operating mode button 2.
All operating modes can be selected both with and without

automatic levelling.

Automatic Levelling
Working with Automatic Levelling (see figures C–E)
Position the measuring tool on a level and firm support, attach
it to the holder 15 or to the tripod 16.
When working with automatic levelling, push the On/Off
switch 4 to the " on" position.
After switching on, the automatic levelling function automati-
cally compensates irregularities within the self-levelling range
of ±4°. The levelling is finished as soon as the laser points or
laser lines 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 laser
beams flash. This alarm is deactivated within 10 s after
switching on, in order to allow adjustment of the measuring
tool.
Set up the measuring tool in 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 laser beams light up
continuously.
In case of ground vibrations or position changes during oper-
ation, the measuring tool is automatically levelled in again. To
avoid errors by moving the measuring tool, check the position
of the laser beams with regard to the reference points upon
re-levelling.
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1 609 92A 0KZ | (14.5.14)