Bosch Professional GRL 400 H Instructions Manual page 13

Rotary laser
Protection rating
A) At 25 °C
B) The working range may be reduced by unfavourable environ-
mental conditions (e.g. direct sunlight).
C) Along the axes
D) Only non-conductive deposits occur, whereby occasional tem-
porary conductivity caused by condensation is expected.
The serial number (10) on the type plate is used to clearly identify
your measuring tool.
Assembly
Inserting/changing the batteries
It is recommended that you use alkaline manganese batter-
ies to operate the measuring tool.
To remove the battery compartment (7), turn the locking
mechanism (8) to position . Pull the battery compartment
out of the measuring tool and insert the batteries.
When inserting the batteries, ensure that the polarity is cor-
rect according to the illustration on the inside of the battery
compartment.
Always replace all the batteries at the same time. Only use
batteries from the same manufacturer and which have the
same capacity.
Slide the battery compartment (7) into the measuring tool
and turn the locking mechanism (8) to position .
Take the batteries out of the measuring tool when you
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are not using it for a prolonged period of time. The bat-
teries can corrode and self-discharge during prolonged
storage in the measuring tool.
Charge-control indicator
When the battery warning (6) flashes red for the first time,
the measuring tool can still be operated for approx. 2 hours.
When the battery warning (6) lights up red continuously, no
further measurements can be taken. The measuring tool
switches off automatically after 1 minute.
Operation
Protect the measuring tool from moisture and direct
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sunlight.
Do not expose the measuring tool to any extreme tem-
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peratures or fluctuations in temperature. For example,
do not leave it in a car for extended periods of time. If it
has been subjected to significant fluctuations in temper-
ature, first allow the measuring tool to adjust to the ambi-
ent temperature and then always carry out an accuracy
check before continuing work (see "Accuracy Check of
the Measuring Tool", page 14).
The precision of the measuring tool may be compromised
if exposed to extreme temperatures or fluctuations in
temperature.
Bosch Power Tools
Avoid substantial knocks to the measuring tool and
GRL 400 H u
avoid dropping it. Always carry out an accuracy check
IP56 (protection
before continuing work if the measuring tool has been
against dust ingress
subjected to severe external influences (see "Accuracy
and water jets)
Check of the Measuring Tool", page 14).
Keep the work area free from obstacles that could re-
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flect or obstruct the laser beam. For example, cover
any reflective or shiny surfaces. Do not measure
through panes of glass or similar materials. The meas-
urements may be distorted by a reflected or obstructed
laser beam.
Starting Operation of the rotary laser
Setting up the measuring tool
Due to its high levelling accuracy, the measuring tool is very
sensitive to knocks and vibrations and changes in position.
Take care, therefore, that the measuring tool is stable to
avoid interruptions to the operation caused by relevelling.
Switching On and Off
To switch on the measuring tool, press the on/off
button (4). All indicators light up briefly. The measuring tool
emits the variable laser beam (2) from the outlet
aperture (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).
The measuring tool immediately starts automatic levelling.
During levelling, the status indicator (5) flashes green, the
laser does not rotate and flashes.
The measuring tool is levelled in as soon as the status
indicator (5) lights up green continuously and the laser lights
up continuously. After levelling is completed, the measuring
tool automatically starts in rotational operation.
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.
The measuring tool exclusively operates with fixed rotational
speed in rotational operation, which is also suitable for use
of a laser receiver.
When factory set, the shock-warning function is automatic-
ally switched on and the shock-warning function
indicator (3) lights up green.
To switch off the measuring tool, briefly press the on/off
button (4). When the shock warning has actuated (the
shock-warning function indicator (3) flashes red), briefly
press the on/off button once to restart the shock-warning
function and then press it briefly again to switch off the
measuring tool.
To save the batteries, the measuring tool is automatically
switched off when not within the self-levelling range for
Place the measuring tool on a stable surface in
the horizontal position or mount it on the
tripod (14).
1 609 92A 8LK | (20.04.2023)
English | 13