Operating Modes; Automatic Levelling; Accuracy Check Of The Measuring Tool - Bosch GLL 2-15 G Professional Manual Original

14 | English
The precision of the measuring tool may be compromised
if exposed to extreme temperatures or fluctuations in
temperature.
Avoid substantial knocks to the measuring tool and
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avoid dropping it. Always carry out an accuracy check
before continuing work if the measuring tool has been
subjected to severe external influences (see "Accuracy
Check of the Measuring Tool", page 14).
Switch the measuring tool off when transporting it.
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The pendulum unit is locked when the tool is switched off,
as it can otherwise be damaged by big movements.
Switching On/Off
To switch on the measuring tool, slide the on/off switch (4)
to the "On" position. As soon as it is switched on, the meas-
uring tool emits laser beams from the outlet apertures (1).
Do not direct the laser beam at persons or animals and
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do not stare into the laser beam yourself (even from a
distance).
To switch off the measuring tool, slide the on/off switch (4)
to the Off position. The pendulum unit is locked when the
tool is switched off.
Never leave the measuring tool unattended when
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switched on, and ensure the measuring tool is
switched off after use. Others may be blinded by the
laser beam.
If the maximum permitted operating temperature of 50 °C is
exceeded, the tool shuts down to protect the laser diode.
Once it has cooled down, the measuring tool is operational
again and can be switched back on.
Automatic shut-off
If no button on the measuring tool is pressed for approx.
120 min, the measuring tool will automatically switch itself
off to preserve battery life.
To switch the measuring tool back on after it has been auto-
matically switched off, you can either slide the on/off
switch (4) to the "Off" position first and then switch the
measuring tool back on, or press the laser operating mode
button (3).
To deactivate the automatic shut-off function, hold down the
laser mode button (3) for at least 3 s (with the measuring
tool switched on). If the automatic shut-off function is deac-
tivated, the laser beams will flash briefly as confirmation.
Note: If the operating temperature exceeds 45 °C, automatic
shut-off can no longer be deactivated.
To activate the automatic shut-off function, switch the meas-
uring tool off and on again.

Operating Modes

The measuring tool has several operating modes, which you
can switch between at any time:
– Cross-line mode (see figure A): Generates one horizontal
and one vertical laser line
– Horizontal mode (see figure B): Generates one horizontal
laser line
1 609 92A 5EM | (20.03.2020)
– Vertical mode (see figure C): Generates one vertical laser
line
To change the operating mode, press the button for laser op-
erating mode (3) as often as required until the laser beams
are generated in the required operating mode.
All operating modes can be used with both automatic level-
ling and the incline function.

Automatic Levelling

The measuring tool monitors the position at all times during
operation. It works with automatic levelling during set-up
within the self-levelling range of ±4°. Outside of the self-lev-
elling range, it will automatically switch to the incline func-
tion.
Working with automatic levelling (see figures A–C)
Position the measuring tool on a level, firm surface or attach
it to the holder (10) or the tripod (15).
The automatic levelling function automatically compensates
irregularities within the self-levelling range of ±4°. Once the
laser beam is permanently lit, the measuring tool has levelled
in.
If automatic levelling is not possible, e.g. because the sur-
face on which the measuring tool stands deviates by more
than 4° from the horizontal plane, the laser lines will initially
flash quickly for 2 seconds, then quickly flash every
5 seconds several times. The measuring tool is in the incline
function.
For additional work with automatic levelling, set up the
measuring tool so that it is horizontal and wait for the self-
levelling procedure to complete. As soon as the measuring
tool is within the self-levelling range of ±4°, the laser beams
will light up continuously.
In case of ground vibrations or position changes during oper-
ation, the measuring tool is automatically levelled again.
Upon levelling, check the position of the laser beams with re-
gard to the reference points to avoid errors arising from a
change in the measuring tool's position.
Working with the Incline Function (see figure D)
Place the measuring tool on an inclined surface. When work-
ing with the incline function, the laser lines will initially flash
quickly for 2 seconds, then quickly flash every 5 seconds
several times.
In the incline function, the laser lines are no longer levelled
and no longer necessarily run perpendicular to one another.

Accuracy Check of the Measuring Tool

Influences on Accuracy
The largest influence is exerted by the ambient temperature.
In particular, temperature differences that occur from the
ground upwards can refract the laser beam.
Since the temperature stratification is greatest at ground
level, you should mount the measuring tool on a tripod and
position it in the centre of the work surface, wherever this is
possible.
In addition to external influences, device-specific influences
(e.g. falls or heavy impacts) can also lead to deviations. For
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