Inserting/Replacing The Batteries; Initial Operation; Automatic Levelling - Bosch GLL 2-50 Professional Manual Original

OBJ_BUCH-817-005.book Page 14 Tuesday, May 6, 2014 10:15 AM
14 | English
Assembly

Inserting/Replacing the Batteries

Use only alkali-manganese batteries.
To open the battery lid 8, press the latch of the battery lid 11
in the direction of the arrow and remove the battery lid. Insert
the supplied batteries. When inserting, pay attention to the
correct polarity according to the representation on the inside
of the battery compartment.
When the battery indication 5 flashes red, the batteries must
be replaced.
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-dis-
charge.
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 or falling of the measuring tool. Af-
ter heavy exterior impact on the measuring tool, an accura-
cy check should always be carried out before continuing to
work (see "Levelling Accuracy").
 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 7 to
the " on" position (when working without automatic level-
ling) or to the " on" position (when working with automat-
ic levelling). Immediately after switching on, the measuring
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 7 to
the "off" position. When switching off, the levelling unit is
locked.
Deactivating the Automatic Shut-off
The measuring tool switches off automatically after an operat-
ing duration of 30 minutes. To deactivate the automatic
switch-off, keep the operating mode button 4 pressed for 3 s
while switching on the measuring tool. When the automatic
switch-off is deactivated, the laser lines briefly flash after 3 s.
1 609 92A 0KJ | (6.5.14)
 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 (without the operating mode button 4
pushed).
Operating Modes (see figures A–D)
The measuring tool has three operating modes between
which you can switch at any time:
– Horizontal operation "–": Produces a horizontal laser line,
– Vertical operation "l": Produces a vertical laser line,
– Cross-line operation "+": Produces a horizontal and verti-
cal laser line.
After switching on, the measuring tool is in cross-line operat-
ing mode. To change the operating mode, press the operating
mode button 4.
All three operating modes can be selected either with or with-
out automatic levelling.
Pulse Function
When working with the laser receiver 21, the pulse function
must be activated, – independent of the selected operating
mode.
In pulse function, the laser lines flash at very high frequency
and thus become detectable by the laser receiver 21.
To switch on the pulse function, press button 3. When the
pulse function is switched on, the pulse-function indicator 2
lights up green.
When the pulse function is switched on, the visibility of the la-
ser lines is reduced for the human eye. Therefore, shut off the
pulse function by pushing button 3 again when working with-
out laser receiver. When the pulse function is switched off,
the pulse-function indicator 2 is deactivated.

Automatic Levelling

Working with Automatic Levelling (see figure C)
Position the measuring tool on a level and firm support or at-
tach it to a commercially available photographic tripod.
When working with automatic levelling, push the On/Off
switch 7 to the " on" position.
After switching on, the levelling function automatically com-
pensates irregularities within the self-levelling range of ±4°.
The measuring tool is levelled in as soon as the laser lines no
longer flash.
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.
In this case, bring the measuring tool to the level position and
wait for the self-levelling to take place.
In case of ground vibrations or position changes during oper-
ation, the measuring tool is automatically levelled in again. To
avoid errors, check the position of the horizontal and vertical
laser line with regard to the reference points upon re-levelling.
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