-13-
Inclination determination with center line
mode (see figure D)
Using center line mode, the inclination of a
surface can be measured up to max. 8.5%. To
do this, set up the rotary laser at the base of
the inclination in a horizontal position on a tri-
pod. The X- or Y-axis of the rotary laser must
be aligned with the inclination to be deter-
mined. Switch on the rotary laser and allow
it to level in.
Secure the laser receiver to a measuring rod
(25) with the holder. Place the measuring rod
at the base of the inclined surface close to
the measuring tool. Align the height of the la-
ser receiver on the measuring rod so that the
laser beam of the rotary laser is indicated as
“centred”
1 2
.
Then place the measuring rod with the laser
receiver at the upper end of the inclined sur-
face at
1 2
. Ensure that position of the laser
receiver on the measuring rod remains un-
changed.
Start center line mode for the axis to which
the inclined surface is aligned. At the end of
center line mode, the inclination of the sur-
face is shown on the rotary laser.
Anti-strobe protection filter
The laser receiver has electronic filters for
strobe light. The filters protect against, for ex-
ample, interference from the warning lights of
construction machinery.
Practical Advice
Aligning with the spirit level
The laser receiver can be aligned vertically
(plumb line) with the spirit level (7). If a laser
receiver is mounted at an angle, it will give
incorrect measurements.
Marking
You can mark the height of the laser beam at
the center mark (9) on the left and right of the
laser receiver when the beam hits the center
of the reception area (1).
When marking, take care to align the laser
receiver so that it is exactly vertical (with a
horizontal laser beam) or horizontal (with a
vertical laser beam), as otherwise the marks
are offset with respect to the laser beam.
Attaching using the holder (see figure E)
You can use the holder (23) to attach the laser
receiver to a measuring rod (25) (accessory)
as well as to other objects with a width of up
to 65 mm.
Screw the holder (23) to the retainer opening
(11) on the rear side of the laser receiver with
the fastening screw (26).
Loosen the rotary knob (24) on the holder,
slide the holder onto the measuring rod (25)
and retighten the rotary knob (24).
You can use a spirit level (21) to ensure that
the holder (23) is horizontally aligned along
with the laser receiver. If a laser receiver is
mounted at an angle, it will give incorrect
measurements.
The upper edge (22) of the holder is located
at the same height as the center mark (9) and
can be used to mark the laser beam.
Attaching using a magnet (see figure F)
If an attachment is not required to be espe-
cially secure, the laser receiver can be at-
tached to steel parts using the magnets (10).
Rectifying errors
Text display (e)
Problem
Corrective measure
PNK
Failed to estabish Bluetooth® connection
to the laser GRL4000-80
Read and observe the operating
instructions for the GRL4000-80
ERR
Failed to calibrate the rotary laser GRL4000-80
Read and observe the operating
instructions for the GRL4000-80
Center line mode failed
Press any button to terminate the
function. Check the position of the
rotary laser and laser receiver before
restarting the function.
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