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Line operation/point operation
(for GRL4000-80CHV only)
To switch to line or point operation, press the
line operation button (5) or the line operation
button (29) on the remote control.
To change the aperture angle,
press the line operation button
(5) or the line operation button
(29) on the remote control until
the required operating mode is indicated on
the display. The aperture angle is reduced in
stages each time a button is pressed until
point operation is achieved. Pressing the line
operation button again takes you back to line
operation via rotational operation at moder-
ate speed.
Note: Due to inertia, it is possible for the laser
to slightly move beyond the end point of the
laser line.
Functions
Turning the line/point within the
rotational plane (for GRL4000-80CHV only)
In line and point operation, the laser line or
the laser point can be positioned within the
rotational plane of the laser. Rotation is pos-
sible by 360°.
To rotate anticlockwise, press the button (4)
on the measuring tool or the button for anti-
clockwise rotation (30) on the remote control.
To rotate clockwise, press the button (3) on
the measuring tool or the button for clockwise
rotation (37) on the remote control.
Turning the rotational plane when
in the vertical position
(for GRL4000-80CHV only)
When the laser level is in the vertical position,
it is possible to rotate the laser point, laser
line or rotational plane around the Y-axis for
easy sighting out or parallel alignment in a
range of ±8.5%.
To start the function, press the
button for setting the slope (14)
on the laser level or the button for
setting the slope (32) on the re-
mote control. The indicator for setting the
slope of the Y-axis will appear and the symbol
for the Y-axis will flash.
To rotate the rotational plane, press the ▲ but-
ton (4) or the ▼ button (3) on the measuring
tool or the up (31) or down (36) slope button
on the remote control until the required posi-
tion is reached.
Automatic plumb point function in the
vertical position (for GRL4000-80CHV only)
When the laser level is in the vertical position,
the variable laser beam (8) can automatically
be aligned vertically downwards for plumbing
by using the remote control or via the Bosch
Levelling Remote App.
To start the downwards plumb
point function, press the plumb
point function button (26) on the
remote control. The plumb point
function symbol will appear on the display
while the variable laser beam is aligned verti-
cally. After it has been successfully aligned,
the plumb point function indicator (e) will ap-
pear on the start screen.
Note: Possible rotation of the rotational plane
around the Y-axis is not in the form of rotation
around the plumb point.
Center line mode
In center line mode, the laser level automati-
cally attempts to align the laser beam to the
center line of the laser receiver by moving the
rotation head up and down. The laser beam
can be aligned in relation to the X-axis or the
Y-axis of the laser level.
Center line mode is started at the laser re-
ceiver. For this, please read and observe the
operating instructions for the laser receiver.
During the search, the center line
mode indicator for each axis will ap-
pear on the display of the laser level
and the status display (12) will flash red.
If the laser beam could be aligned to the cen-
ter line of the laser receiver, the center line
mode will automatically finish and the slope
found will be indicated on the home screen.
If the laser beam could not be
aligned to the center line of the laser
receiver, an error message will ap-
pear on the display. Before restarting the
function, check the position of the laser level
and the laser receiver.
Mask mode (see figure C)
In rotational operation, the variable laser
beam (8) can be switched off for one or more
quadrants of the rotational plane. This makes
it possible to limit the risk related to laser
beams to certain areas. Interference from the
laser beam that affects other tools or inter-
ference with the laser receiver by unintended
reflections can also be avoided.
