Hilti PR 25, Manual, Page: 22 / 141

18
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7. Operation
7.1 Switching the tool on
Press the on/off key.
7.2 Selecting the speed of rotation
The speed of rotation can be adjusted by pressing the
rotation speed control key (PR 25 or PRA 25). After
switching on, the PR 25 is set to rotate at medium speed,
as standard.
– Press the key once to set rotation to medium speed.
– Press the key again to set rotation to high speed.
– Press the key once more to return to medium speed.
– Press the key yet again to set rotation to low speed.
– A further press of the key stops rotation (spot).
– The next press of the key sets rotation to low speed.
– This procedure repeats itself.
7.2.1 Selecting the line function

After pressing the line function key, the PR 25 projects
a laser line. The line can be lengthened or shortened by
pressing the key again.
– Press the key once to project a short line.
– Press the key again to project a medium-length line.
– Press the key once more to project a long line.
– Press the key yet again to project an extra-long line.
– A further press of the key switches the tool back to the
long line.
– The next press of the key switches the tool back to the
medium-length line.
– This procedure repeats itself.
7.2.2 Moving the laser line and spot
The laser line or laser spot can be moved to the left or
right by pressing the direction keys (PR 25 or PRA 25).
Holding down the direction keys increases the speed of
movement and the laser line or spot then move contin-
uously.
6.2 LED indicators
Auto leveling LED
The LED blinks rapidly.
The LED lights constantly.
Shock warning LED
All LEDs blink.
The shock warning LED lights red.
Battery voltage LED
The LED lights.
Inclination LED
The X and Y LEDs do not light.
The X LED does not light and the Y LED lights red.
The X LED lights red and the Y LED does not light.
The X LED lights red and the Y LED lights red.
The tool is leveling itself automatically.
The tool has leveled itself/is operating normally.
The tool has been bumped or brought out of level tem-
porarily.
The shock warning LED lights red after deactivation of
the shock warning.
The batteries are almost exhausted.
Operation in the horizontal plane.
The Y-direction has been aligned manually or by way
of auto alignment. X-direction is still under automatic
control.
The X-direction has been aligned manually or by way
of auto alignment. Y axis is still under automatic con-
trol.
The X- and Y-directions have been aligned manually or
by way of auto alignment. The shock warning system
is deactivated.
6.3 Inserting new batteries

1. Open the battery compartment by turning the lock-
ing button.
2. Insert the batteries in the battery compartment. Take
care to ensure correct polarity.
3. Close the battery compartment by turning the lock-
ing button.
Printed: 07.07.2013 | Doc-Nr: PUB / 5070173 / 000 / 00