Automatic Levelling; Remote Control Via The Levelling Remote App; Calibration Warning Cal Guard - Bosch GLL Professional Serie Manual Original

After you switch it on, the measuring tool generates a hori-
zontal laser plane. To change the operating mode, press the
laser mode button (7).
All operating modes can be selected with or without auto-
matic levelling.
Receiver Mode
Receiver mode must be activated when working with the
laser receiver (28), regardless of which operating mode is
selected.
In receiver mode, the laser lines flash at a very high fre-
quency, enabling them to be detected by the laser receiver
(28).
To switch on receiver mode, press the receiver mode button
(5). The receiver mode indicator (6) will light up green.
When receiver mode is switched on, the laser lines are less
visible to the human eye. Therefore, switch receiver mode
off by pressing the receiver mode button (5) again to work
without a laser receiver. The receiver mode indicator (6) will
go out.

Automatic Levelling

Working with Automatic Levelling
Position the measuring tool on a level, firm surface or attach
it to the holder (24) or the tripod (31).
For work with automatic levelling, slide the on/off
switch (16) to the " On" position.
The automatic levelling function automatically levels irregu-
larities within the self-levelling range of ±4°. The levelling is
finished as soon as the laser lines do not move anymore.
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 begin to
flash quickly. If the signal tone function is activated, rapid
signal tones will sound.
Set up the measuring tool in a horizontal 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 lines
will light up continuously and the signal tones will cease.
In case of ground vibrations or position changes during oper-
ation, the measuring tool is automatically levelled again.
Upon re-levelling, check the position of the horizontal or ver-
tical laser line with regard to the reference points to avoid er-
rors.
Working without Automatic Levelling
For work without automatic levelling, slide the on/off
switch (16) to the " On" position. When automatic levelling
is switched off, the "working without automatic levelling" in-
dicator (4) lights up red and the laser lines flash slowly and
continuously.
If you switch off the automatic levelling system, you can hold
the measuring tool freely in your hand or set it down on a
sloping surface. This means that the laser lines are no longer
necessarily running perpendicularly to one another.
Bosch Power Tools

Remote control via the Levelling Remote App

The measuring tool is equipped with a Bluetooth® module
which uses radio technology to enable remote control via a
smartphone with a Bluetooth® interface.
The Levelling Remote App application (app) is required to
use this function. You can download this in the app store for
your terminal device (Apple App Store, Google Play Store).
Information about the 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.
Switching on Bluetooth®
To switch on Bluetooth®, press the Bluetooth® button (9).
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-
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 (8) lights up.
The Bluetooth connection may be interrupted if the distance
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 (8) will flash.
Switching off Bluetooth®
To switch off Bluetooth® for remote control, press the
Bluetooth® button (9) or switch off the measuring tool.

Calibration warning CAL guard

The sensors for calibration warning CAL guard monitor the
status of the measuring tool, even when it is switched off. If
the measuring tool is not being supplied with power by a re-
chargeable battery or non-rechargeable batteries, an in-
ternal energy storage system provides continuous monitor-
ing by the sensors for 72 hours.
The sensors are activated when the measuring tool is started
up for the first time.
Calibration Warning Triggers
If one of the following events occurs, the calibration warning
CAL guard is triggered and the indicator CAL guard (3)
lights up red:
– The calibration interval (every 12 months) has expired.
– The measuring tool was stored outside of the storage
temperature range.
– The measuring tool was subjected to a strong shock (e.g.
impact with the ground after being dropped).
You can refer to the Levelling Remote App to see which of
the three events triggered the calibration warning. Without
the app, the cause cannot be identified, as the indicator CAL
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