Initial Operation; Automatic Levelling; Working Advice - Bosch PCL 20 Manual Original

OBJ_BUCH-725-005.book Page 11 Friday, May 9, 2014 11:22 AM
Operation

Initial Operation

 Protect the measuring tool against moisture and direct
sun light.
 Do not subject the measuring tool to extreme tempera-
tures 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 measuring tool to ad-
just to the ambient temperature before putting it into oper-
ation.
 Avoid heavy impact to or falling down of the measuring
tool. Damage to the measuring tool can impair its accura-
cy. After heavy impact or shock, compare the laser lines or
plumb beams with a known horizontal or vertical reference
line or with already checked plumb points.
 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, push the On/Off switch 7 to
the "On" position. Immediately after switching on, the meas-
uring tool sends out the two laser lines 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 measuring tool, slide the On/Off switch 7 to
the "Off" position. When switching off, the levelling unit is
locked.
 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.
Operating Modes (see figures A – E)
After switching on, the measuring tool is in cross-line operat-
ing mode with automatic levelling.
To change the operating mode, press the "Mode" button 6
until the requested operating mode is indicated by the corre-
sponding illuminated operating-mode indication 5.
The following operating modes are available:
Indica- Operating Mode
tion
Cross-line operation with automatic levelling
(see figure A): The measuring tool generates
(green) both a horizontal and a vertical laser line; their
levelling is monitored.
Horizontal operation with automatic levelling
(see figure B): The measuring tool generates a
(green) horizontal laser line; its levelling is monitored.
Vertical operation with automatic levelling
(see figure C): The measuring tool generates a
(green) vertical laser line; its levelling is monitored.
Bosch Power Tools
Indica- Operating Mode
tion
Plumb beam with automatic levelling
(see figure D): The measuring tool generates two
(green) plumb beams running vertically upward and
downward; their levelling is monitored.
Cross-line operation without automatic level-
ling (see figure E): The measuring tool generates
two crossed laser lines that can be aligned as re-
quested, and must not run vertical to each other.
(red/
green)

Automatic Levelling

Working with Automatic Levelling (see figure F–G)
Position the measuring tool on a level and firm support, attach
it to the wall mount 13 or to a tripod 12.
Select one of the operating modes with automatic levelling.
After switching on, the levelling function automatically com-
pensates irregularities within the self-levelling range of ±4°.
The levelling is finished as soon as the laser lines or plumb
beams do not move any more. The indication 5 of the current
operating mode lights up green.
If the automatic levelling function is not possible, e.g. because
the surface on which the measuring tool stands deviates by
more than 4° from the horizontal plane, the automatic level-
ling indicator 4 lights up red and the laser is automatically
switched off. In this case, bring the measuring tool to the 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°
again, the operating-mode indication 5 lights up green and
the laser is switched on.
When not within the self-levelling range of ±4°, working with
automatic levelling is not possible, because it cannot be as-
sured that the laser lines run at a right angle to each other.
In case of ground vibrations or position changes during oper-
ation, the measuring tool is automatically levelled in again. To
avoid errors, check the position of the laser lines or plumb
beams with regard to the reference points upon re-levelling.
Working without Automatic Levelling
When automatic levelling is switched off, you can hold the
measuring tool freely in your hand or place it on an inclinded
surface. The two laser lines no longer necessarily run vertical
to each other.

Working Advice

Working with the Tripod (see figure H)
A tripod 12 offers a stable, height-adjustable measuring sup-
port. Place the measuring tool via the tripod mount 8 onto the
1/4" male thread of the tripod and screw the locking screw of
the tripod tight.
Working with the Wall Mount (Accessory)
With the wall mount 13, the measuring tool can be securly
attached at any height.
English | 11
1 609 92A 0JR | (9.5.14)