Hilti PRA 90 Manual De Instrucciones página 23

2. On the control panel of the tripod, press the appropriate arrow buttons in order to move the tripod
upwards or downwards.
6.3 Working with tripod and laser receiver/remote control unit 4,
Before use, the laser receiver/remote control unit has to be paired with the tripod to enable
communication between the two devices.
The rotating laser also has to be paired separately with the laser receiver/remote control unit. This
establishes the three-device pairing that is essential for automatic alignment of the laser plane.
1. Press the On/Off button on the tripod and on the remote control unit and hold the buttons pressed
simultaneously for at least 3 seconds.
▶ Successful pairing is indicated by a chain symbol on the display of the laser receiver/remote control
unit, accompanied by flashing of all the LEDs on the PRA 90. Both devices then switch off
automatically.
2. Switch the tripod, the rotating laser and the laser receiver/remote control unit on.
▶ The display of the laser receiver/remote control shows the rotating laser including tripod, with the
active wireless connection depicted as a wave.
▶ If there is no active radio connection, a warning triangle appears on the display instead of the wave.
6.4 Align using the automatic tripod PRA 90
When used for the first time, the laser receiver/remote control unit has to be paired with the tripod.
1. Screw the rotating laser onto the tripod. → page 16
2. Switch the tripod, the rotating laser and the laser receiver/remote control unit on. → page 17
3. Now align the height of the laser plane manually → page 17 or automatically → page 17.
6.4.1 Manual alignment
▶ On the laser receiver/remote control unit press the +/- buttons or on the PRA 90 press the arrow buttons
to move the horizontal plane up or down in parallel.
6.4.2 Automatic alignment
1. Hold the receiver side of the laser receiver/remote control unit at the desired target height and facing
toward the control panel of the PRA 90. Hold the laser receiver/remote control unit steady while alignment
is in progress and make sure that the line of sight between laser receiver/remote control unit and rotating
laser is clear.
2. Double-click the "Automatic alignment" button on the laser receiver/remote control unit. Double-click
the button again to end the alignment procedure.
▶ This double-click starts the process of bringing the laser plane into alignment, and the tripod moves
up or down, as appropriate. An acoustic signal sounds continuously while this is in progress. As
soon as the laser beam strikes the detection area of the laser receiver/remote control unit, the beam
moves toward the position of the marking notch (reference plane). When the position is reached and
the rotating laser has leveled itself, a signal tone of five seconds' duration sounds to indicate the
conclusion of the process. The "Automatic alignment" symbol disappears.
3. Check the height settings in the display.
4. Remove the laser receiver/remote control unit.
If the automatic alignment process was not successful, short signal tones are emitted and the
"Automatic alignment" symbol goes out.
7 Care and maintenance
Observe the temperature limits of ­25 °C (-13 °F) to +60 °C (140 °F) if you keep your equipment inside
a motor vehicle.
• Always keep the threaded rod free from coarse dirt and concrete residues.
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