Hilti PR 20 User Manual

PR 20

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ja

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Operating instructions

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

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

180˚

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 instruc­tions are with the tool when it is
given to other persons.

Component parts

PR 20 rotating laser

햲 Laser beam (plane of rotation)
햳 Rotating head
햴 Control panel
햵 Grip
햶 Battery compartment
햷 Base plate with 5/8" thread

PR 20 control panel

햸 On / off button
햹 Shock warning deactivation key
햺 Servo key (sets X/Y inclination /

direction)

햻 Auto leveling LED
햽 Shock warning deactivation LED
햾 Battery LED
햿 X-inclination / direction LED
헀 Y-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

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1

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

General warning

Laser class 2
(Do not stare into the
beam.)

Symbole

Read the operating
instructions before
use.

Return waste material
for recycling

These numbers refer to the correspon­ding illustrations. The illustrations can be
found on the fold-out cover pages. Keep
these pages open when studying the oper­ating 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 oper­ating instructions and always refer to it
when making an enquiry to your Hilti rep­resentative 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.

2

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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 X­and 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

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3

4. Technical data for the PR 20

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

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]

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

4

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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 deter­mining, 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 opera­tion, 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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5

5. Safety precautions

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 influ­enced 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.

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.

5.5 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 acclima­tized before use.

– If mounting on an adaptor, ensure that

6

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

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 wind­screens, 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.

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7



7. Operation

7. Operation

7.1 Switching the tool on and using the
laser detector

1. The PRA 20 laser detector can be used
within an area up to 400m (1300ft) in
diameter.The laser beam is indicated by
visible and audible signals.

2. Mount the PRA 20 detector securely on
the telescopic staff or leveling staff and
switch it on by pressing the on / off key.

3. Set the desired sensitivity by pressing
the laser plane detection tolerance selec­tion key.

4. Optional settings:
Use the audible signal setting key to
select the desired volume level.
Switching on sets the detector to the
standard signal volume. Adjust the
signal volume by pressing this key
repeatedly until the desired volume is
set (normal / loud / off).

5. Hold the PRA 20 within the plane of the
rotating laser beam.The laser beam is
indicated by visible and audible signals.

7.2 Working in the horizontal plane

1. Set up the tool in a suitable way for the
application to be carried out, e.g. on a
tripod.

2. Press the on / off button.

3. The auto leveling LED blinks green.
Shortly before the tool achieves the cor­rect level, the laser beam switches
on and begins to rotate. The auto level­ing LED lights constantly.

7.3 Working in manual mode

1. Set up the tool in a suitable way for
the application to be carried out, e.g.
on a tripod.

2. The horizontal plane is no longer moni­tored when manual mode is selected for
the X- and Y-directions.

3. Inclination in the X-direction: Press the
X-servo key twice within 2 seconds.
The X-direction can then be adjusted
manually by way of the X-key. The LED
lights red.

4. Inclination in the Y-direction: Press the

Y-servo key twice within 2 seconds. The
Y-direction can then be adjusted manual­ly by way of the Y-key. The LED lights
red.

5. To return to the original mode, switch

the tool off and then on again.

-NOTE-

If the tool has been used immediately
beforehand in manual mode (manual
adjustment of the X- and/or Y-direction)
the settings last used can be retained by
pressing one of the inclination / direction
keys within 3 seconds after switching the
tool on. This must then be confirmed by
pressing the inclination / direction key, oth­erwise the tool returns to the standard
operating mode..

8

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7. Operation / 8. Hilti calibration service

7.4 Deactivating the inclined plane
function

The inclined plane function can be deacti­vated by pressing a special key combina­tion. The inclination adjustment keys are
then no longer active.

The deactivation procedure is started with
the tool switched off.
Procede by pressing the following key
combination:
– Press and hold down the Y- and the

shock warning keys simultaneously and
then press the on /off button.
Subsequently press the Y+ button within
10 seconds (release the other keys
before pressing the Y+ key).

The inclined plane function can be reacti­vated when required. This is done by
pressing the same key combination once
again.

8. Hilti calibration service

We recommend that the tool is checked by
the Hilti calibration service at regular inter­vals in order to verify its reliability in
accordance with standards and legal
requirements.

Use can be made of the Hilti calibration
service at any time, but checking at least
once a year is recommended.

The calibration service provides confirma­tion that the tool is in conformance, on the
day it is tested, with the specifications
given in the operating instructions.

If deviations from the manufacturer's
specification are found, the tool is then
re-adjusted. After checking and adjustment,
a calibration sticker applied to the tool and
a calibration certificate provide written
verification that the tool operates in
accordance with the manufacturer's
specification.

Calibration certificates are always required
by companies certified according to ISO
900x.

Your local Hilti center or representative will
be pleased to provide further information.

8.1 Checking horizontal rotation

Horizontal alignment of the tool in the X- or
Y-directions can be checked as follows:

8.1.1 Checking 

1. Set up the tool in the horizontal plane at
a distance of about 20m (65 ft) from a
wall (can also be carried out with the
tool set up on a tripod).

2. With the aid of the laser detector, make

a mark on the wall.

3. Pivot the tool through 180° about its

own axis (check the same laser axis).

4. With the aid of the laser detector, make

a second mark on the wall.

If the check has been carried out carefully,
the distance between the marks A and B
should be less than 2 mm / 0,15 inch (at
20 m / 65 ft from the wall).
In the event of a deviation in excess of
this, please return the tool to a Hilti Service
Center for inspection.

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9

9. Care and maintenance / 10. Disposal

9. Care and maintenance

9.1 Cleaning and drying

– Blow dust off the lenses.
– Do not touch the glass with your fingers.
– Use only a clean, soft cloth for cleaning.

If necessary, slightly moisten the cloths
with pure alcohol or a little water.

- NOTE -

– Do not use any other liquids as these

may damage the plastic parts.

– Observe the temperature limits when

storing your equipment. This is particu­larly important in winter or summer,
especially if the equipment is kept inside
a vehicle (storage temperatures: -30°C
to +60°C / -22°F to +140°F).

9.2 Storage

– Remove the tool from its case if it has

become wet. Clean and dry the tool, its
carrying case and accessories (at max.
temperature of 40°C / 108° F). Re-pack
the equipment only when it is completely
dry.

– Check the accuracy of the equipment

before it is used after a long period of
storage or transportation.

– Remove the batteries if the tool is to be

stored for a long period.

10. Disposal

-CAUTION-

Improper disposal of the equipment may
have serious consequences:
– The burning of plastic components gen-

erates toxic fumes which may present a
health hazard.

– Batteries may explode if damaged or

exposed to very high temperatures and
thus cause poisoning, burns, acid
burns or environmental pollution.

– Careless disposal may permit unautho-

rized and improper use of the equipment,
possibly leading to serious personal
injury, injury to third parties
and pollution of the environment.

Most of the materials from which Hilti tools
or appliances are manufactured can be
recycled. The materials must be properly
separated before they can be recycled.
In many countries, Hilti has already made
arrangements for taking back old tools and
appliances for recycling. Ask Hilti customer
service or your Hilti representative for
further information.

9.3 Transportation

Use either the original Hilti cardboard box
or packaging of equivalent quality for
transporting or shipping your equipment.

- NOTE -

Always remove the batteries before
shipping the tool.

10

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10. Disposal / 11. Manufacturer's warranty – tools

*

Dispose of batteries in

11. Manufacturer's warranty – tools

accordance with national
regulations.
Please help to protect our
environment.

Hilti warrants that the tool supplied is free
of defects in material and workmanship.
This warranty is valid so long as the tool is
operated and handled correctly, cleaned

Only for EU countries
Disposal of electric tools
together with household
waste is not permissible!
In observance of European
Directive 2002/ 96 /EC on

and serviced properly and in accordance
with the Hilti Operating Instructions, and
the technical system is maintained. This
means that only original Hilti consumables,
components and spare parts may be used
in the tool.

waste electrical and electro ­nic equipment and its im ­plementation in accordance
with national law, electric
tools that have reached the
end of their life must be
collected separately and re -

This warranty provides the free-of-charge
repair or replacement of defective parts
only over the entire lifespan of the tool.
Parts requiring repair or replacement as a
result of normal wear and tear are not cov­ered by this warranty.

turned to an environmental­ly compatible recycling
facility.

Additional claims are excluded, unless
stringent national rules prohibit such
exclusion. In particular, Hilti is not obli­gated for direct, indirect, incidental or
consequential damages, losses or
expenses in connection with, or by rea­son of, the use of, or inability to use the
tool for any purpose. Implied warranties
of merchantability or fitness for a particu­lar purpose are specifically excluded.

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For repair or replacement, send tool or
related parts immediately upon discovery
of the defect to the address of the local
Hilti marketing organization provided.

This constitutes Hilti's entire obligation
with regard to warranty and supersedes all
prior or contemporaneous comments and
oral or written agreements concerning war­ranties.

11

12. FCC statement / 13. EC conformity

12. FCC statement
(applicable in US)

- WARNING -

This equipment has been tested and has
been found to comply with the limits for a
class B digital device, pursuant to part 15
of the FCC rules.
These limits are designed to provide rea­sonable protection against harmful interfer­ence in a residential installation. This
equipment generates, uses, and can radiate
radio frequency energy and, if not installed
and used in accordance with the instruc­tions, may cause harmful interference to
radio communications. However, there is
no guarantee that interference will not
occur in a particular installation.
If this equipment does cause harmful inter­ference to radio or television reception,
which can be determined by turning the
equipment on and off, the user is encour­aged to try to correct the interference by
one or more of the following measures:
– Re-orient or re-locate the receiving

antenna.

– Increase the separation between the

equipment and receiver.

– Consult the dealer or an experienced

TV / radio technician for assistance.

Product information plate

PR 20

Made in Germany
Hilti= registered trademark of the Hilti Corporation, Schaan, Liechtenstein

LASER RADIATION - DO NOT

STARE INTO BEAM

620-690nm/0.95mW max.
CLASS II LASER PRODUCT

N 60825-1:2003

E
This Laser Product
complies with 21CFR
1040 as applicable

Power: 4,5V=nom./120 mA

13. EC conformity

Designation: Rotating laser
Type: PR 20
Year of design: 2003

In conformance with

We declare, on our own responsibility,
that this product complies with the follow­ing standards or standardization docu­ments: EN 50081-1 and EN 50082-1
according to the stipulations of the
directive 89/336/EEC.

1/4

s

2

19587
3

Changes or modifications not expressly
approved by Hilti could limit the user’s
right to operate the equipment.

12

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Hilti Corporation

Matthias Gillner
Head BU
Measuring Systems
12/2004

Dr. Heinz-Joachim Schneider
Executive Vice President
BA Electric
Tools & Accessories
12/2004

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