Bosch Professional GLL 50 G Original Instructions Manual page 13

English | 13
If the maximum permitted operating temperature of 40 °C is exceeded, the tool shuts
down to protect the laser diode. Once it has cooled down, the measuring tool is opera-
tional again and can be switched back on.
Automatic Levelling (see figures A−B)
Position the measuring tool on a level, firm support or attach it to a tripod (16).
After switching on, the automatic levelling function automatically compensates irregular-
ities within the self-levelling range of ±3.5°. The levelling is finished as soon as the laser
lines are permanently lit (i.e. no longer flashing) and do not move anymore.
If automatic levelling is not possible, e.g. because the surface on which the measuring
tool stands deviates by more than 3.5° from the horizontal plane, the laser lines will flash
continuously and quickly and the measuring tool will work without automatic levelling.
The laser lines remain switched on, but the two intersecting lines will no longer necessar-
ily be perpendicular to each other.
To work with automatic levelling again, 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 ±3.5° and is levelled in, the laser lines will light up con-
tinuously again.
In case of ground vibrations or position changes during operation, the measuring tool is
automatically levelled again. Upon re-levelling, check the position of the horizontal or
vertical laser line with regard to the reference points to avoid errors by moving the meas-
uring tool.
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.
In order to minimise thermal influences resulting from heat rising from the floor, it is re-
commended that you use the measuring tool on a tripod. In addition, position the meas-
uring tool 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 this reason, check the levelling accuracy each time be-
fore beginning work.
First check the height accuracy and levelling accuracy of the horizontal laser line, then
the levelling accuracy of the vertical laser line.
Should the measuring tool exceed the maximum deviation during one of the tests, please
have it repaired by a Bosch after-sales service.
Bosch Power Tools 1 609 92A 8K4 | (01.06.2023)