Bosch GPL 5 Original Instructions Manual page 10

OBJ_BUCH-815-002.book Page 10 Tuesday, March 13, 2012 2:43 PM
10 | English
Assembly
Inserting/Replacing the Battery
Alkali-manganese batteries are recommended for the meas-
uring tool.
To open the battery compartment 3, turn the latch 2 in clock-
wise direction to position and pull off the battery lid. In-
sert the batteries provided. When inserting, pay attention to
the correct polarity according to the representation on the in-
side of the battery compartment.
Position the battery lid to the bottom of the housing and then
push it upward. To lock the battery lid, turn the latch 2 in anti-
clockwise direction to the position.
When the laser beams flash slowly during operation, the bat-
teries are low. When the flashing begins, the measuring tool
can be operated for approx. 8 h.
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
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.
After heavy exterior impact on the measuring tool, an accu-
racy 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, push the On/Off switch 4
upward so that "I" is indicated on the switch. Immediately
after switching on, the measuring tool sends a laser beam out
of each exit opening 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, push the On/Off switch 4
downward so that "0" is indicated on the switch. When
switching off, the levelling unit is locked.
1 609 929 S07 | (13.3.12)
Setting the Automatic Switch-off
By default, the measuring tool automatically shuts off
20 minutes after being switched on.
The automatic switch-off can be set from 20 minutes to
8 hours. For this, switch the measuring tool on, then immedi-
ately off, and then on again within 4 s. To confirm the change,
all laser beams will flash quickly for 2 s after switching on the
second time.
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.
When switching on the measuring tool the next time, the auto-
matic switch-off is set to 20 minutes again.
Working with Automatic Levelling
Position the measuring tool on a level and firm support, attach
it to the holder 8 or to the tripod 18.
After switching on, the automatic levelling function automati-
cally compensates irregularities within the self-levelling range
from ±5° (longitudinal axis) and ±3° (lateral axis). The level-
ling is finished as soon as the laser points do not move any
more.
If the automatic levelling function is not possible, e.g. be-
cause the surface on which the measuring tool stands devi-
ates by more than 5° or 3° from the horizontal plane, the laser
beams flash rapidly. In this case, bring the measuring tool to
the level position and wait for the self-levelling to take place.
As soon as the measuring tool is within the self-levelling range
of ±5° or ±3° respectively, all laser beams light up continu-
ously again.
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.
Levelling Accuracy
Influences on Accuracy
The ambient temperature has the greatest influence. Espe-
cially temperature differences occurring from the ground up-
ward can divert the laser beam.
As thermal fluctuation is largest close to the ground, the
measuring tool, if possible, should be mounted on a commer-
cially available tripod and placed in the centre of the working
area.
Apart from exterior influences, device-specific influences
(such as heavy impact or falling down) can lead to deviations.
Therefore, check the accuracy of the measuring tool each
time before starting your work.
Should the measuring tool exceed the maximum deviation
during one of the tests, please have it repaired by a Bosch
after-sales service.
When the levelling accuracy of the horizontal laser beams for
the lateral and longitudinal axis is within the maximum allow-
able deviation, then the levelling accuracy for the plumb
beams (vertical axis) is thus also checked.
Bosch Power Tools