Bosch Professional GCL 2-50 CG Original Instructions Manual page 26

26 | English
tool has been levelled as soon as the laser beams stop flash-
ing.
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 beams will flash
quickly.
If this is the case, set up the measuring tool in a 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 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 a pendulum lock (see figure F)
For work with the pendulum lock, slide the on/off switch (2)
to the " On" position. The pendulum lock indicator (5)
lights up red and the laser lines continuously flash slowly.
For work with the pendulum lock, automatic levelling is
switched off. You can hold the measuring tool freely in your
hand or place it on a sloping surface. This means that the
laser beams are no longer levelled and no longer necessarily
run perpendicular to one another.
Remote control via Bluetooth®
The measuring tool is equipped with a Bluetooth® module
which uses radio technology to enable remote control via a
smartphone with a Bluetooth® interface.
Information about system requirements for a Bluetooth®
connection can be found on the Bosch website at
www.bosch-pt.com.
When remote controlling via Bluetooth®, poor reception con-
ditions can cause time delays between the mobile terminal
device and the measuring tool.
Bosch applications (apps) are available for remote con-
trolling. They can be downloaded in the respective stores,
depending on the terminal/device:
Switching on Bluetooth®
To switch on Bluetooth®, press the Bluetooth® button (10).
Ensure that the Bluetooth® interface is activated on your mo-
bile terminal device.
The connection between mobile end device and measuring
tool is established after the Bosch application has started. If
multiple active measuring tools are found, select the appro-
1 609 92A 8M1 | (19.04.2023)
priate measuring tool. A connection will be established auto-
matically if only one active measuring tool is found.
The connection is established as soon as the Bluetooth® in-
dicator (9) lights up.
The Bluetooth® connection may be interrupted if the dis-
tance between the measuring tool and the mobile terminal
device is too great or is blocked, and if there are any sources
of electromagnetic interference. Should this occur, the
Bluetooth® indicator (9) will flash.
Switching off Bluetooth®
To switch off Bluetooth® for remote control, press the
Bluetooth® button (10) or switch off the measuring 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 recommended that you use the
measuring tool on a tripod. In addition, position the measur-
ing 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 before
beginning work.
First check the height accuracy and levelling accuracy of the
horizontal laser line, then the levelling accuracy of the ver-
tical laser line and the plumb accuracy.
Should the measuring tool exceed the maximum deviation
during one of the tests, please have it repaired by a Bosch
after-sales service.
Checking the Height Accuracy of the Horizontal Line
For this check, you will need a free measuring distance of
5 m on firm ground between two walls (designated A and B).
– Mount the measuring tool close to wall A on a tripod, or
place it on a firm, level surface. Switch on the measuring
tool. Select cross-line mode with automatic levelling.
A
5 m
– Aim the laser at the closer wall A and allow the measuring
tool to level in. Mark the middle of the point at which the
laser lines cross on the wall (point I).
B
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