Initial Operation; Operating Modes; Automatic Levelling - Bosch GLL 2-80 P Professional Manual Original

OBJ_BUCH-907-002.book Page 13 Thursday, November 29, 2012 12:48 PM
If the batteries are weak when switching on the measuring
tool, the 5 s audio signal will sound directly after switching on
the measuring tool.
Always replace all batteries at the same time. Only use batter-
ies from one brand and with the identical capacity.
 Remove the batteries from the measuring tool when
not using it for extended periods. When storing for ex-
tended periods, the batteries can corrode and discharge
themselves.
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 long time. In case of large varia-
tions 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 or falling of the measuring tool. Af-
ter heavy exterior impact on the measuring tool, an accura-
cy check should always be carried out before continuing to
work (see "Levelling Accuracy").
 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 7 to
the " on" position (when working without automatic level-
ling) or to the " on" position (when working with automat-
ic levelling). 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 7 to
the "off" position. When switching off, the levelling unit is
locked.
When exceeding the maximum permitted operating tempera-
ture of 45 °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, either
slide the On/Off switch 7 to the "off" position and then switch
Bosch Power Tools
the measuring tool on again or press the operating mode button
5 once or press the pulse-function button 3 once.
To deactivate the automatic shut-off, keep the operating
mode button 5 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 or press and hold the operating mode
button 5 for at least 3 s.
Deactivating the Signal Tone
After the measuring tool has been switched on, the audio sig-
nal is always activated.
To deactivate/activate the audio signal, press and hold the
operating mode button 5 and the pulse-function button 3 at
the same time for at least 3 s.
The audio signal activation and deactivation are both con-
firmed by three short beeps.

Operating Modes

The measuring tool has three operating modes between
which you can switch at any time:
– Horizontal operation: generates a horizontal laser plane,
– Vertical operation: generates a vertical laser plane,
– Cross-line operation: generates a horizontal and vertical
laser plane.
After switching on, the measuring tool is in horizontal opera-
tion. Press the operating mode button 5 to change the operat-
ing mode.
All three operating modes can be selected either with or with-
out automatic levelling.
Pulse Function
When working with the laser receiver 17, the pulse function
must be activated, – independent of the selected operating
mode.
In pulse function, the laser lines flash at very high frequency
and thus become detectable by the laser receiver 17.
To switch on the pulse function, press button 3. When the
pulse function is switched on, the pulse-function indicator 4
lights up green.
When the pulse function is switched on, the visibility of the la-
ser lines is reduced for the human eye. Therefore, shut off the
pulse function by pushing button 3 again when working with-
out laser receiver. When the pulse function is switched off,
the pulse-function indicator 4 is deactivated.

Automatic Levelling

Working with Automatic Levelling
Position the measuring tool on a level and firm support, attach
it to the holder 19 or to the tripod 22.
When working with automatic levelling, push the On/Off
switch 7 to the " on" position.
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