Bosch GCL 25 PROFESSIONAL: English

OBJ_BUCH-1546-002.book Page 13 Monday, July 9, 2012 10:30 AM

English | 13

f Switch the measuring tool off during transport. When

Automatic Levelling

switching off, the levelling unit, which can be damaged in

case of intense movement, is locked.

Working with Automatic Levelling (see figures C–E)

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

Switching On and Off

it to the holder 15 or to the tripod 16.

To switch on the measuring tool, slide the On/Off switch 4 to

When working with automatic levelling, push the On/Off

the “on” position (when working without automatic level-

switch 4 to the “ on” position.

ling) or to the “on” position (when working with automat-

ic levelling). Immediately after switching on, the measuring

After switching on, the automatic levelling function automati-

tool sends laser beams out of the exit openings 1.

cally compensates irregularities within the self-levelling range

of ± 4°. The levelling is finished as soon as the laser points or

f Do not point the laser beam at persons or animals and

laser lines do not move any more.

do not look into the laser beam yourself, not even from

a large distance.

If the automatic levelling function is not possible, e.g. be-

cause the surface on which the measuring tool stands devi-

To switch off the measuring tool, slide the On/Off switch 4 to

ates by more than 4° from the horizontal plane, the laser

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

beams flash. This alarm is deactivated within 10 s after

locked.

switching on, in order to allow adjustment of the measuring

Deactivating the Automatic Shut-off

tool.

When no button on the measuring tool is pressed for approx.

Set up the measuring tool in level position and wait for the

30 minutes, the measuring tool automatically switches off to

self-levelling to take place. As soon as the measuring tool is

save the batteries.

within the self-levelling range of ±4°, the laser beams light up

To switch on the measuring tool after automatic shut-off, either

continuously.

slide the On/Off switch 4 to the “off” position and then switch

In case of ground vibrations or position changes during oper-

the measuring tool on again or press the operating mode button

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

2 once.

avoid errors by moving the measuring tool, check the position

To deactivate the automatic shut-off, keep the operating

of the laser beams with regard to the reference points upon

mode button 2 pressed for at least 3 s (while the measuring

re-levelling.

tool is switched on). Deactivation of the automatic shut-off is

confirmed by brief flashing of the laser beams.

Working without Automatic Levelling (see figure F)

For work without automatic levelling, push the On/Off switch

f Do not leave the switched on measuring tool unattend-

4 to the “ on” position. When the automatic levelling is

ed and switch the measuring tool off after use. Other

switched off, the laser lines flash continuously.

persons could be blinded by the laser beam.

When automatic levelling is switched off, you can hold the

To activate the automatic shut-off, switch the measuring tool

measuring tool freely in your hand or place it on an inclinded

off and then on again.

surface. The laser beams no longer necessarily run vertical to

Operating Modes

each other.

The measuring tool has several operating modes between

which you can switch at any time:

Levelling Accuracy

– Cross and point-line operation: The measuring tool gener-

Influences on Accuracy

ates a horizontal and a vertical laser line facing toward the

The ambient temperature has the greatest influence. Espe-

front as well as a vertical point beam each facing upward

cially temperature differences occurring from the ground

and downward, and a horizontal point beam each facing

upward can divert the laser beam.

toward the front and to both sides.

As thermal fluctuation is largest close to the ground, the

– 5-point operation: The measuring tool generates a vertical

measuring tool, if possible, should be mounted on a commer-

point beam each facing upward and downward, as well as

cially available tripod and placed in the centre of the working

a horizontal point beam each facing toward the front and to

area.

both sides.

– Horizontal line operation: The measuring tool generates a

Apart from exterior influences, device-specific influences

horizontal laser line facing frontward.

(such as heavy impact or falling down) can lead to deviations.

– Vertical line operation: The measuring tool generates a ver-

Therefore, check the accuracy of the measuring tool each

tical laser line facing frontward.

time before starting your work.

All point beams run at a 90° angle to each other; the laser

When the accuracy of the horizontal point beams is within the

lines also cross each other at a 90° angle.

maximum allowed deviation, then the accuracy of the vertical

point beams and the laser lines is thus also checked.

After switching on, the measuring tool is in cross-line and

point-line operation. To change the operating mode, press

Should the measuring tool exceed the maximum deviation

the operating mode button 2.

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

ter-sales service.

All operating modes can be selected both with and without au-

tomatic levelling.

Bosch Power Tools 1 618 C00 50R | (9.7.12)