Hilti PR 20 User manual

PR 20
Operating instructions
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Printed: 07.07.2013 | Doc-Nr: PUB / 5070169 / 000 / 00

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Printed: 07.07.2013 | Doc-Nr: PUB / 5070169 / 000 / 00

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Printed: 07.07.2013 | Doc-Nr: PUB / 5070169 / 000 / 00

1
PR 20 rotating laser Contents
It is essential that the operating
instructions are read before the tool
is used the first time.
Always keep these operating
instructions together with the tool.
Ensure that the operating instruc-
tions are with the tool when it is
given to other persons.
Component parts

PR 20 rotating laser
햲Laser beam (plane of rotation)
햳Rotating head
햴Control panel
햵Grip
햶Battery compartment
햷Base plate with 5/8" thread
PR 20 control panel
햸On / off button
햹Shock warning deactivation key
햺Servo key (sets X/Y inclination /
direction)
햻Auto leveling LED
햽Shock warning deactivation LED
햾Battery LED
햿X-inclination / direction LED
헀Y-inclination / direction LED
Contents
Page
1. General information . . . . . . . . . . . . . .2
2. Description . . . . . . . . . . . . . . . . . . . . .2
3. Accessories . . . . . . . . . . . . . . . . . . . .3
4. Technical data . . . . . . . . . . . . . . . . . . .4
5. Safety precautions . . . . . . . . . . . . . . .5
6. Getting started . . . . . . . . . . . . . . . . . .7
7. Operation . . . . . . . . . . . . . . . . . . . . . .8
8. Hilti calibration service . . . . . . . . . . . .9
9. Care and maintenance . . . . . . . . . . .10
10. Disposal . . . . . . . . . . . . . . . . . . . . .10
11. Manufacturer's warranty – tools . . .11
12. FCC statement . . . . . . . . . . . . . . . .12
13. EC declaration of conformity . . . . .12
Printed: 07.07.2013 | Doc-Nr: PUB / 5070169 / 000 / 00

2
1. General information / 2. Description
1. General information
1.1 Safety notices and their meaning
- CAUTION -
This word indicates a possibly hazardous
situation which could result in slight bodily
injuries or damage to property.
- NOTE -
This word indicates information to help the
user employ the product efficiently, and
other useful notes.
1.2 Pictograms
Warning signs
Symbole

These numbers refer to the correspon-
ding illustrations. The illustrations can be
found on the fold-out cover pages. Keep
these pages open when studying the oper-
ating instructions. In these operating
instructions, the PR 20 rotating laser is
referred to as "the tool".
1.3 Location of identification data on the
tool
The type designation and serial number
can be found on the rating plate on the
tool. Make a note of this data in your oper-
ating instructions and always refer to it
when making an enquiry to your Hilti rep-
resentative or service department.
Type : PR 20
Serial-no.: ____________
2. Description
2.1 PR 20 rotating laser
The PR 20 is a rotating laser with one
rotating laser beam.
2.2 Features
_ The tool allows a single person to level
or align in any plane quickly and with
great accuracy (always in conjunction
with the PRA 20 laser detector).
_ The laser’s speed of rotation is 300
r.p.m. (revolutions per minute) once the
tool has leveled itself.
_ Automatic leveling (within ±5°
inclination).
_ LEDs for indication of operating status
_ Built-in shock warning: The tool switches
to warning mode (all LEDs blink, laser
stops rotating) when brought out of level
as a result of vibration or an impact dur-
ing operation.
_ Automatic cut-out: The laser remains
switched off and all LEDs blink if the tool
is outside its self-leveling range or if
movement of the mechanism is
physically impeded.
General warning
Laser class 2
(Do not stare into the
beam.)
Read the operating
instructions before
use.
Return waste material
for recycling
Printed: 07.07.2013 | Doc-Nr: PUB / 5070169 / 000 / 00

3
2. Description / 3. Tools and accessories
_ The tool can be set up on a tripod with a
5/8" thread or stood directly on some
other steady surface.
_ The tool is easy to operate, robustly built
and comparatively light in weight.
2.3 Description of functions
2.3.1 Horizontal plane
(automatic leveling)
When switched on, the tool levels itself
automatically by way of the 2 built-in servo
motors for the X- and Y-directions.
2.3.2 Inclined plane (manual adjustment
to any desired slope)
Inclination can be set up in alignment with
given marks or contours by pressing the X-
and Y-keys.
2.3.3 Automatic cut-out
During automatic leveling in one or both
directions, the servo system monitors
compliance with the specified accuracy.
The tool switches itself off in the following
situations:
– Leveling is not accomplished (tool set up
outside leveling range or mechanism
physically impeded)
– The tool is brought out of level (due to
vibration or impact)
After automatic cut-out, rotation of the
laser beam stops and all LEDs blink.
Items supplied
1 PR 20 rotating laser
1 PRA 20 laser detector
1 PRA 75 laser detector holder
1 PR 20 operating instructions
1 PRA 20 operating instructions
3 batteries (size D cells)
2 batteries (size AA cells)
1 PRA 52 slope calculator
1 manufacturer’s certificate
1 desiccant sachet
1 Hilti toolbox
3. Tools and accessories
Accessories
Various tripods PA 910, PA 911, PA
921 and PA 931/2
Laser detector PRA 20
Laser detector-
holder PRA 75
Leveling staffs PA 950/960 and
PA 951/961
Battery charger PUA 80
Battery pack PRA 801
Slope calculator PRA 52
Printed: 07.07.2013 | Doc-Nr: PUB / 5070169 / 000 / 00

4. Technical data for the PR 20
Range (diameter)
2 to 400m [6 to 1300’] with PRA
20 laser detector
Accuracy (at 24°C/+75°F)
± 0.5mm @ 10m [0.2” @ 32.8’]
Laser product class
Class 2, visible, 650nm, < 1mW
(IEC825-1/EN60825;
FDA 21 CFR 1040)
Speed of rotation [r.p.m.]
300 (operating speed)
Self-leveling range
± 5°, LED indicator
Automatic cut-out
When the laser is brought out of
level (after 1 minute), unless both
axes set to inclined mode:
- rotation stops
- all LEDs blink
Status indicators
- Auto leveling LED
- Battery condition LED
- Shock warning LED
- X inclination/direction LED
- Y inclination/direction LED
Power supply
3 x size D alkaline batteries
Battery life at 20°C [+68°]
Alkaline batteries: > 80 hours
NiMh batteries: > 60 hours
Operating temperature
-20 to +50°C
[-4° to +122°F]
Storage temperature
-30 to +60°C dry
[-22° to +140°F]
Protection class
IP 56 (as per IEC 529)
Tripod thread
5/8" x 18
Weight
Approx. 2.4 kg (5.3 lbs.)
including 3 batteries
Dimensions
186(L) x 186(W) x 213(H) mm
[7.3"(L) x 7.3"(W) x 10.9"(H) inches]
4
4. Technical data for the PR 20
Printed: 07.07.2013 | Doc-Nr: PUB / 5070169 / 000 / 00

5
5. Safety precautions
5. Safety precautions
5.1 Basic information concerning safety
In addition to the information relevant to
safety given in each of the sections of
these operating instructions, the following
points must be strictly observed at all
times.
5.2 Intended use
The tool is designed to be used for deter-
mining, transferring or checking alignment
in the horizontal and inclined planes, e.g.:
– Transferring datum and height marks
– Setting out inclines
Hilti offers various accessories that allow
optimum use to be made of the tool.
5.3 Misuse
– The tool and its accessories may present
hazards when used incorrectly by
untrained personnel or when used not
as directed.
– To avoid the risk of injury, use only origi-
nal Hilti accessories and additional
equipment.
– Modification of the tool is not
permissible.
– Observe the information printed in the
operating instructions concerning opera-
tion, care and maintenance.
– Do not render safety devices ineffective
and do not remove information and
warning notices.
– Keep laser tools out of reach of children.
– Have the tool repaired only at a
Hilti service centre. Failure to follow the
correct procedures when opening the
tool may cause emission of laser
radiation in excess of class 2.
– Take the surrounding conditions into
account. Do not use the tool where there
is a risk of fire or explosion.
5.4 Proper organization of the workplace
– Secure the area in which you are work-
ing. When setting up the tool, take care
to avoid directing the beam towards
yourself or other people.
– Avoid unfavorable body positions when
working on ladders. Make sure you have
a stable stance and stay in balance at all
times.
– Measurements taken through panes of
glass or other objects may be inaccurate.
– Ensure that the tool is set up on a steady
surface (not subject to vibration).
– Use the tool only within its specified lim-
its.
5.4.1 Electromagnetic compatibility
Although the tool complies with the strict
requirements of the relevant guidelines,
Hilti cannot entirely rule out the following
possibilities:
– The tool may cause interference to other
equipment, e.g. aircraft navigational
equipment.
– The tool may be subject to interference
caused by powerful radiation, which can
then lead to incorrect operation.
Check the readings for plausibility when
measuring in these conditions or if you
are unsure of the results.
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6
5.4.2 Laser classification
The tool conforms to laser class 2 based
on the IEC825-1 / EN60825-01 standard
and class II based on CFR 21 § 1040
(FDA). These tools may be used without
need for further protective measures. The
eyelid closure reflex protects the eyes if a
person looks into the beam unintentionally
for a brief moment. The eyelid closure
reflex can, however, be negatively influ-
enced by medication, alcohol or drugs.
Nevertheless, as with the sun, a person
should not look directly into sources of
bright light. The laser beam should not be
directed towards persons.
Laser information plates based
on IEC825 / EN6082-1
Laser information plates for the US
based on CFR 21 § 1040 (FDA)
This laser product complies with 21 CFR
1040, as applicable.
5.5 General safety precautions
– Check the tool before use. If the tool is
found to be damaged, have it repaired at
a Hilti service center.
– The accuracy of the tool must be
checked after it has been dropped or
subjected to other mechanical stressing.
– When the tool is brought into a warm
environment from very cold conditions,
or vice versa, allow it to become acclima-
tized before use.
– If mounting on an adaptor, ensure that
the tool is screwed on securely.
– Keep the laser exit aperture clean to
avoid measurement errors.
– Although the tool is designed for the
tough conditions of jobsite use, as with
other optical instruments (binoculars,
spectacles, cameras) it should be treated
with care.
– Although the tool is protected to prevent
entry of dampness, it should be wiped
dry each time before being put away in
its transport container.
– Check the tool before using it for impor-
tant leveling work.
5.5.1 Electrical
– Do not allow the batteries to fall into the
hands of children.
– Do not overheat or incinerate the batter-
ies. They may explode or release toxic
substances.
– Do not attempt to recharge the batteries.
– Do not solder the batteries into the tool.
– Do not discharge the batteries by short
circuiting. This may cause overheating
and swelling of the batteries.
– Do not attempt to open the batteries and
do not subject them to excessive
mechanical stress.
5. Safety precautions
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7
6. Getting started
6. Getting started
-NOTE-
The tool may be powered only by the PRA
801 battery pack or by batteries
manufactured according to the
IEC standard.
PR 801 battery pack
– The performance of the battery pack
drops at low temperatures.
– Store the battery pack at room
temperature.
– Never store the battery pack where
it is exposed to direct sunlight, on
a radiator or heater, or behind glass
(windows, motor vehicle wind-
screens, etc).
Batteries
– Do not use damaged batteries.
– Do not mix old and new batteries.
Do not mix batteries of different
types or batteries from various
manufacturers.
6.1 Switching on the tool
Press the ON / OFF key.
-NOTE-
After switching on, the tool begins to level
itself automatically.
6.2 LED indicators
Auto leveling LED
The LED blinks rapidly.
The tool is leveling itself
automatically.
The LED lights constantly.
The tool has leveled itself / is
operating normally.
Shock warning LED
All LED’s blink.
The tool has been bumped or
brought out of level temporarily.
The shock warning LED lights red.
The shock warning LED lights red
after deactivation of the shock
warning.
Battery voltage LED
The LED lights.
The batteries are almost exhausted.
Inclination LED
The X and Y LEDs do not light.
Operation in the horizontal plane.
The X LED does not light and
The Y LED lights red
Manual operation: Y-direction can
be aligned manually by way of the
servo keys.
X–direction is still under automatic
control.
The X LED lights red and
The Y LED does not light
Manual operation: X direction can
be aligned manually by way of the
servo keys.
Y axis is still under automatic
control.
The X LED lights red and
The Y LED lights red
Manual operation: X and Y direc-
tions can be aligned manually by
way of the servo keys.
The shock warning system is
deactivated.
6.3 Inserting new batteries

1.Open the battery compartment by
turning the locking button.
2.Insert the batteries in the battery
compartment. Take care to ensure
correct polarity.
3.Close the battery compartment by
turning the locking button.
Printed: 07.07.2013 | Doc-Nr: PUB / 5070169 / 000 / 00