Automatic Levelling; Accuracy Check Of The Measuring Tool - Bosch GRL 250 HV Professional Originalbetriebsanleitung

26 | English
Functions
Turning the Line/Point in a Horizontal Position
within the Rotational Plane (see figure A)
When the measuring tool is in a horizontal position, the laser
line or the laser point can be positioned within the rotational
plane of the laser. Rotation is possible by 360°.
For this, manually turn the rotation head (10) to the re-
quired position or use the remote control: Press the button
for clockwise rotation (29) on the remote control to rotate
clockwise, and the button for anticlockwise rotation (30) on
the remote control to rotate anticlockwise. In rotational op-
eration, pressing the buttons has no effect.
Turning the Rotational Plane when in the
Vertical Position (see figure B)
When the measuring tool is in the vertical position, it is pos-
sible to rotate the laser point, laser line or rotational plane
around the vertical axis for easy sighting out or parallel align-
ment in a range of ±8 %.
Press the button for clockwise rotation (29) on the remote
control to rotate clockwise.
Press the button for anticlockwise rotation (30) on the re-
mote control to rotate anticlockwise.

Automatic Levelling

Overview
The measuring tool will automatically detect the horizontal or
vertical position. To change between the horizontal and
the vertical position, switch the measuring tool off, reposi-
tion it and switch it on again.
After switching on, the measuring tool checks the horizontal
and vertical position and automatically levels out any un-
evenness within the self-levelling range of approx. ±8 %
(±4.6°).
During levelling, the status indicator (3) flashes green, the
laser does not rotate and flashes.
The measuring tool is levelled in as soon as the status
indicator (3) lights up green continuously and the laser lights
up continuously. After levelling is completed, the measuring
tool automatically starts in rotational operation.
When the measuring tool is out-of-level by more than 8 %
after switching it on or after a position change, levelling in is
no longer possible. In this case, the rotor is stopped, the
laser flashes and the status indicator (3) continuously lights
up red.
Reposition the measuring tool and wait for it to re-level.
Without repositioning, the laser is automatically switched off
after 2 minutes and the measuring tool after 2 hours.
When the measuring tool is levelled in, it continuously
checks the horizontal and vertical position. Re-levelling is
automatically performed if there are any position changes.
To avoid faulty measurements, the rotor stops during the
levelling process, the laser flashes and the status
indicator (3) flashes green.
1 609 92A 5S1 | (09.09.2020)
Shock-Warning Function
The measuring tool has a shock-warning function. After posi-
tion changes or shock to the measuring tool, or in case of
ground vibrations, it keeps the measuring tool from levelling
in at changed positions, and thus prevents errors caused by
a change in the measuring tool's position.
Switching on/activating the shock-warning function:
Press the shock-warning button (2). The shock-warning
indicator (1) lights up green continuously. The shock warn-
ing is activated approximately 30 seconds after the shock-
warning function has been switched on.
Shock warning actuated: If the levelling-accuracy range is
exceeded when changing the position of the measuring tool
or a severe knock is registered, the shock warning will be ac-
tuated. The laser will stop rotating, the laser beam will flash,
the status indicator (3) will go out and the shock-warning
indicator (1) will flash red.
The current operating mode is stored.
After the shock warning has actuated, press the shock-warn-
ing button (2) on the measuring tool or the shock-warning
reset button (28) on the remote control. The shock-warning
function is restarted and the measuring tool starts the level-
ling. As soon as the measuring tool is levelled in (levelling
indicator (3) continuously lights up green), it starts in the
stored operating mode.
Now check the position of the laser beam at a reference
point and, if necessary, correct the height or alignment of
the measuring tool.
When, after the shock-warning function has actuated, the
function is not restarted by pressing the shock-warning
button (2) on the measuring tool or the shock-warning reset
button (28) on the remote control, the laser is automatically
switched off after 2 minutes and the measuring tool after
2 hours.
Switching off the shock-warning function: Press the
shock-warning button (2) once or, when the shock warning
has actuated (shock-warning indicator (1) flashing red),
press it twice. When the shock-warning function is switched
off, the shock-warning indicator goes out.
Note: The shock-warning function cannot be switched on or
off with the remote control; it can only be restarted after
having actuated.

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 always mount the measuring tool on a tri-
pod for measuring distances of 20 m or more. In addition,
position the measuring tool in the centre of the work surface,
wherever this is possible.
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