Manual Bosch GLL 2-15 (page 13 of 205) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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English | 13

Bosch Power Tools 1 609 92A 0KH | (28.4.14)

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 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 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, push the On/Off switch 3 to

the “On” position. Immediately after switching on, the meas-

uring tool sends two laser beams out of the 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, slide the On/Off switch 3 to

the “Off” position. When switching off, the levelling unit is

locked.

Deactivating the Automatic Shut-off

The measuring tool switches off automatically after an operat-

ing duration of 120 minutes. To deactivate the automatic

switch-off, keep the operating mode button 4 pressed for 3 s

while switching on the measuring tool. When the automatic

switch-off is deactivated, the laser lines briefly flash after 3 s.

 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 (without the operating mode button 4

pushed).

Operation Modes (see figures A –C)

The measuring tool has four operating modes between which

you can switch at any time:

– Horizontal operation “–” (with automatic levelling):

Produces a horizontal laser line,

– Vertical operation “l” (with automatic levelling):

Produces a vertical laser line,

– Cross-line operation “+” (with automatic levelling):

Produces a horizontal and vertical laser line,

– Cross-line operation “+” (without automatic levelling):

Produces a horizontal and vertical laser line.

Once the measuring tool has been switched on, it is in cross-

line operation with automatic levelling. To change the operat-

ing mode, press the operating mode button 4.

If the automatic levelling indicator 5 lights up, the measuring

tool is in the operating mode without automatic levelling. In

this operating mode the respective laser lines are permanent-

ly displayed, regardless of the inclination of the measuring

tool.

Working with Automatic Levelling

Position the measuring tool on a level and firm support, attach

it to the holder 10 or to the tripod 18.

After switching on, the levelling function automatically com-

pensates irregularities within the self-levelling range of ±4°.

The levelling is finished as soon as the laser beams 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 4° from the horizontal plane, the laser

beams flash slowly. 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 ±4°, the laser lines light up continuously again.

In case of ground vibrations or position changes during opera-

tion, the measuring tool is automatically levelled in again. To

avoid errors, check the position of the horizontal and vertical la-

ser line 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

upward 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.

First, check both the height as well as the levelling accuracy of

the horizontal laser line, then the levelling accuracy of the ver-

tical laser line.

Should the measuring tool exceed the maximum deviation

during one of the tests, please have it repaired by a Bosch

after-sales service.

Checking the Height Accuracy of the Horizontal Line

For this check, a free measuring distance of 5 m on a firm

surface between two walls A and B is required.

– Mount the measuring tool onto the holder or a tripod, or

place it on a firm and level surface close to wall A. Switch

the measuring tool on.

OBJ_BUCH-2049-002.book Page 13 Monday, April 28, 2014 4:59 PM

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Bosch GLL 2-15 Manual

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