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GCL 25 PROFESSIONAL
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Bosch GCL 25 PROFESSIONAL [13/189] Objbuch l 546 001 book page 13 tuesday january24 2012 4 18pm

English | 13

Bosch Power Tools 1 618 C00 50R | (24.1.12)

f 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” 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.

f 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.

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 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.

f 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.

Operating Modes

The measuring tool has several operating modes between

which you can switch at any time:

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

ates a horizontal and a vertical laser line facing toward the

front as well as a vertical point beam each facing upward

and downward, and a horizontal point beam each facing

toward the front and to both sides.

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

point beam each facing upward and downward, as well as

a horizontal point beam each facing toward the front and to

both sides.

– Horizontal line operation: The measuring tool generates a

horizontal laser line facing frontward.

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

tical laser line facing frontward.

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

lines also cross each other at a 90° angle.

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

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

the operating mode button 2.

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

tomatic levelling.

Automatic Levelling

Working with Automatic Levelling (see figures C–E)

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

it to the holder 15 or to the tripod 16.

When working with automatic levelling, push the On/Off

switch 4 to the “ on” position.

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 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. 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°, the laser beams light up

continuously.

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.

Working without Automatic Levelling (see figure F)

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

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

switched off, the laser lines flash continuously.

When automatic levelling is switched off, you can hold the

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

surface. The laser beams no longer necessarily run vertical to

each other.

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.

When the accuracy of the horizontal point beams is within the

maximum allowed deviation, then the accuracy of the vertical

point beams and the laser lines is thus also checked.

Should the measuring tool exceed the maximum deviation

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

ter-sales service.

OBJ_BUCH-1546-001.book Page 13 Tuesday, January 24, 2012 4:18 PM

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4 OBJBUCH l 546 001 book Page 13 Tuesday January24 2012 4 18PM English 13 Switch the measuring tool off duringtransport When Automatic Levelling swi tching off the Ievelling unit which can be damaged in Working with Automatic Levelling see figures C E case of intense movement is locked Position themeasuring tool ona level and firmsupport attach Switching On and Off i t to the hoi der 15 or to the tri pod 16 To switch on the measuring tool slide the On Off switch 4 to When working with automatic Ievelling push the On Off the j on position when working without automatic level switch4to the 8 on position ling or to the on position when working with automat After switching on the automatic Ievelling function automati ic levelling Immediately after switching on the measuring cally compensates irr egul arities within the sei f l evell ing range tool sends laser beams out of the exit openings 1 of 4 The levelling is finished as soon as the laser points or Do not point the laser bea m at persons or a nima Is a nd laser lines donot move any more do not look into the laser beam yourself not even from If the automatic levelling function is not possible e g be a large distance 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 10s 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 rangeof 4 thelaser beams light up Toswitchonthemeasuring tool after automaticshut off either continuously sli de the On Off switch 4 to the off position and then swi tch 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 isswitched on Deactivation of the automatic shut off is Working without Automatic Levelling see figure F 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 automaticshut off switch the measuring tool off and then on again Operating Modes The measuring tool has several operating modes between which you can switch at any time Cross and point line operation The measuring tool gener Forwork without automatic levelling push the On Off switch 4 to the 8 on position When the automatic Ievelling is switched off thelaser lines flash continuously When automatic I evelli ng is swi tched off you can hold the measuring tool freely in your hand or place it on an inclinded surface The laser beams no longer necessarily run vertical to each other Levelling Accuracy In fl u en ces on Ac cu ra cy ates a horizontal and a vertical laser line facing toward the The ambient temperature has thegreatestinfluence Espe front as well as a vertical point beam each facing upward cially temperature differences occurring from theground and downward and a horizontal point beam each facing upward can divert the laser beam toward the front and to both sides 5 point operation The measuring tool generates a vertical point beam each facing upward and downward as well as a horizontal point beam each facing toward thefront and to both sides Horizontal line operation The measuring tool generates a horizontal laser line facing frontward Vertical line operation The measuring tool generates avertical laser line facing frontward All point beams run ata 90 angle to each other the laser lines alsocross each other at a90 angle 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 When theaccuracy of the horizontal point beams is within the 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 the operating mode button 2 Should the measuring tool exceed the maximum deviation during one of the tests please have it repaired by a Bosch af ter sales service All operatingmodescan be selected both with and without au tomatic levelling Bosch Power Tools 1618COO5ORK24 1 12

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