Bosch Power Tools GPL3 manual Operation, Leveling Accuracy, Setting the Automatic Switch-off

Operation

Initial Operation

•Protect the tool against moisture and direct sun irradiation.

•Do not subject the tool to extreme temperatures or variations in temperature.

As an example, do not leave it in vehicles for longer periods. In case of large variations in temperature, allow the

tool to adjust to the ambient temperature before putting it into operation. In case of extreme temperatures or variations in temperature, the accuracy of the tool can be impaired.

•Avoid heavy impact or falling of the tool. After heavy exterior impact on the tool, an accuracy check should always be carried out before continuing to work (see “Leveling Accuracy”).

•Switch the tool off during transport. When switching off, the leveling unit, which can be damaged in case of intense movement, is locked.

Switching On and Off

To switch on the tool, push the On/Off switch 4 upward so that “I” is indicated on the switch. Immediately after switching on, the 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 tool, push the On/Off switch 4 downward so that “0” is indicated on the switch. When switching off, the leveling unit is locked.

Setting the Automatic Switch-off

By default, the 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 tool on, then immediately 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 tool unattended and switch the tool off after use. Other persons could be blinded by the laser beam. When switching on the tool the next time, the automatic switch-off is set to 20 minutes again.

Working with Automatic Leveling

Position the tool on a level and firm support, attach it to the holder 8 or to the tripod 18.

After switching on, the automatic leveling function automatically compensates irregularities within the self-leveling range from ±5° (longitudinal axis) and ±3° (lateral axis). The leveling is finished as soon as the laser points do not move any more.

If the automatic leveling function is not possible, e.g. because the surface on which the tool stands deviates by more than 5° (or 3° from the horizontal plane) the laser beams flash rapidly.

In this case, bring the tool to the level position and wait for the self-leveling to take place. As soon as the tool is within the self- leveling range of ±5° or ±3° respectively, all laser beams light up continuously again.

In case of ground vibrations or position changes during operation, the tool is automatically leveled in again. To avoid errors by moving the tool, check the position of the laser beams with regard to the reference points upon re-leveling.

Working Advice

•Always use the center of the laser point for marking. The size of the laser point changes with the distance.

Leveling Accuracy

Influences on Accuracy

The ambient temperature has the greatest influence. Especially temperature differences occurring from the ground upward can divert the laser beam.

As thermal fluctuation is largest close to the ground, the tool, if possible, should be mounted on a commercially available tripod and placed in the center 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 tool each time before starting your work.

Should the tool exceed the maximum deviation during one of the tests, see recalibration procedure or have it recalibrated by a Bosch after-sales service center.

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