Initial Operation; Operating Modes; Working With Automatic Levelling - Bosch GPL 5 C Professional Manual Original

OBJ_BUCH-847-002.book Page 15 Friday, May 16, 2014 7:10 AM
Operation

Initial Operation

 Loud audio signals will sound under certain conditions
while operating the measuring tool. Therefore, keep
the measuring tool away from your ear or other per-
sons. The loud audio signal can cause hearing damage.
 Protect the measuring tool against moisture and direct
sun light.
 Do not subject the measuring tool to extreme tempera-
tures or variations in temperature. As an example, do
not leave it in vehicles for a long time. In case of large vari-
ations in temperature, allow the measuring tool to adjust to
the ambient temperature before putting it into operation.
In case of extreme temperatures or variations in tempera-
ture, the accuracy of the measuring tool can be impaired.
 Avoid heavy impact to or falling down of the measuring
tool. Damage to the measuring tool can impair its accura-
cy. After heavy impact or shock, compare the laser lines or
plumb beams with a known horizontal or vertical reference
line or with already checked plumb points.
 Switch the measuring tool off during transport. When
switching off, the levelling unit, which can be damaged in
case of intense movement, is locked.
Switching On and Off
To switch on the measuring tool, slide the On/Off switch 4 to
the " on". Immediately after switching on, the measuring
tool sends laser beams out of the exit openings 1.
 Do not point the laser beam at persons or animals and
do not look into the laser beam yourself, not even from
a large distance.
To switch off the measuring tool, slide the On/Off switch 4 to
the "off" position. When switching off, the levelling unit is
locked.
When exceeding the maximum permitted operating tempera-
ture of 40 °C, the measuring tool switches off to protect the
laser diode. After cooling down, the measuring tool is ready
for operation and can be switched on again.
Deactivating the Automatic Shut-off
When no button on the measuring tool is pressed for approx.
30 minutes, the measuring tool automatically switches off to
save the batteries.
To switch on the measuring tool after automatic shut-off, ei-
ther slide the On/Off switch 4 to the "off" position and then
switch the measuring tool on again or press the operating
mode button 2 once.
To deactivate the automatic shut-off, keep the operating
mode button 2 pressed for at least 3 s (while the measuring
tool is switched on). Deactivation of the automatic shut-off is
confirmed by brief flashing of the laser beams.
 Do not leave the switched-on measuring tool unattend-
ed and switch the measuring tool off after use. Other
persons could be blinded by the laser beam.
To activate the automatic shut-off, switch the measuring tool
off and then on again.
Bosch Power Tools
Deactivating the Signal Tone
After the measuring tool has been switched on, the audio sig-
nal is always activated.
To deactivate the audio signal, switch the measuring tool off.
Press and hold the operating mode button 2 for at least 1 s
while switching the measuring tool on again. The audio signal
deactivation is confirmed by three short beeps.
To activate the audio signal, switch the measuring tool off and
then on again without pressing the operating mode button 2.

Operating Modes

The measuring tool has three operating modes between
which you can switch at any time:
– Plumb crosses and laser points: The measuring tool gener-
ates two crossed laser lines each running vertically upward
and downward, as well as three horizontal point beams.
– Laser points: The measuring tool generates three horizon-
tal point beams.
– Plumb crosses and front point: The measuring tool gener-
ates two crossed laser lines each running vertically upward
and downward, as well as a horizontal point beam toward
the front.
The point beams run at a 90° angle to each other; the laser
lines also cross each other at a 90° angle. Point beams and
and laser lines run vertically above each other.
After switching on, the measuring tool is in the "plumb cross
and laser point" operating mode. To change the operating
mode, press the operating mode button 2.

Working with Automatic Levelling

Position the measuring tool on a level and firm support, attach
it to the holder 13 or to the tripod 17.
After switching on, the automatic levelling function automati-
cally compensates irregularities within the self-levelling range
of ±4°. The levelling is finished as soon as the laser points or
laser lines do not move any more.
If automatic levelling is not possible, e.g. because the surface
on which the measuring tool stands deviates by more than 4°
from the horizontal plane, the laser lines begin to flash. When
the audio signal is activated, a fast-beat signal sounds for
maximum 30 s. This alarm is deactivated within 10 s after
switching on, in order to allow adjustment of the measuring
tool.
Set up the measuring tool in level position and wait for the
self-levelling to take place. As soon as the measuring tool is
within the self-levelling range of ±4°, all laser beams light up
continuously and the audio signal is switched off.
In case of ground vibrations or position changes during oper-
ation, the measuring tool is automatically levelled in again. To
avoid errors by moving the measuring tool, check the position
of the laser beams with regard to the reference points upon
re-levelling.
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