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PRA 20
Operating instructions
en
*282846*
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1
PRA 20 laser detector Contents / 1. General Information
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
PRA 20 laser detector
On / off key
Laser detection tolerance setting key
(standard or fine)
Key for setting the audible signal
Audible signal emission aperture
Detection area
Display, front side (see detailed illus-
tration)
Marking notch
Reference plane
Battery cover
Mounting thread
Display, rear side
Tolerance indicator (standard or fine)
Indicator showing position of detector
relative to laser plane
Battery condition indicator
PRA 75 laser detector holder
Detector mounting screw
Leveling staff clamping screw
Contents
Page
1. General information ...........................1
2. Description .........................................2
3. Technical data ....................................2
4. Safety precautions .............................2
5. Getting started ...................................3
6. Operation ...........................................4
7. Hilti calibration service .......................4
8. Care and maintenance .......................4
9. Disposal .............................................5
10. Warranty ............................................5
11. FCC statement ....................................6
12. EC declaration of conformity ..............6
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
Symbols
Read the operating
instructions before use.
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2
2. Description / 3. Technical data / 4. Safety precautions
These numbers refer to the corres-
ponding 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 PRA 20 laser detector is
referred to as "the tool".
2. Description
2.1 PRA 20 laser detector
The Hilti PRA 20 is designed to detect the
laser beam emitted by rotating lasers.
2.2 Features
The detector can be employed as a handheld tool or may be mounted on the measuring staff, telescopic staff or on other
leveling staffs, wooden battens or frames
etc. when the appropriate holder is used.
Items supplied
1 PRA 20 laser detector
1 PRA 20 operating instructions
2 batteries (size AA cells)
3. Technical data
Range (diameter)
2 to 400m (6 to 1300 ft)
Laser plane detection tolerance (at 10m)
Fine: ± 0.5 mm (0.02 inch)
Standard: ± 1.0 mm (0.04 inch)
Audible signal
2 volume levels or silent operation
Liquid crystal display
On both sides
Detection window
80 mm (2 3/4 inches)
Center indicator, from top edge of housing
50 mm ( 2 inches)
Marking notches
On both sides
Automatic cut-out
The detector switches itself off after
30 min. when no laser beam is
detected.
Dimensions
165x67x24mm (6.5"x2.6"x0.9" inches)
Weight
0.2 kg (0.4 lbs) including batteries
Power supply
2 x size AA batteries
Battery life at 20°C [+68°]
Alkaline batteries: > approx. 50 hours
Operating temperature
-20° to +50°C
(-4° to +122°F)
Storage temperature
-30° to +60°C
(-22° to +140°F)
Protection class
IP 56 (as per IEC 529)
Mounting thread on detector
M5 x 10 mm (0.4 inch)
4. Safety precautions
4.1 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.
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3
4. Safety precautions / 5. Getting started
4.2 Misuse
- Modification of the tool is not permissible.
- Observe the information printed in the
operating instructions concerning operation, care and maintenance.
- 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.
4.3 Proper organization of the workplace
- 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.
- Use the tool only within its specified
limits.
4.3.1 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.
4.4 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.
- If mounting on an adaptor, ensure that
the tool is screwed on securely.
- Keep the laser detection window clean in
order to avoid measurement errors.
- Although the tool is designed for the
tough conditions of jobsite use, it should
be treated with care, as with other electronic instruments.
- 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.
4.4.1 Electrical
- Do not allow the batteries to fall into the
hands of children.
- Do not overheat or incinerate the batteries. 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. Getting started
-NOTE-
Only the batteries recommended by Hilti
may be used to power the tool.
Page 7
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. Operation
6.1 Switching the tool on
Press the ON / OFF key.
6.2 Working with the laser detector
The PRA 20 laser detector can be used
within an area up to 400m in diameter.
The laser beam is indicated by visible and
audible signals.
1. Mount the PRA 20 detector securely on
the telescopic staff or leveling staff and
switch it on by pressing the on / off
key.
2. Set the desired sensitivity by pressing
the laser plane detection tolerance
selection key.
3. 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).
4. Hold the PRA 20 perpendicular to the
laser beam plane of rotation.
The laser beam is indicated by visible
and audible signals.
4
6. Operation / 7. Hilti calibration service / 8. Care and maintenance
7. Hilti calibration service
We recommend that the rotating laser and
detector are checked by the Hilti calibration
service at regular intervals in order to verify its reliability in accordance with standards and legal requirements.
8. Care and maintenance
8.1 Cleaning and drying
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 sto-
ring 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).
8.2 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.
8.3 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.
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9. Disposal / 10. Warranty
9. Disposal
-CAUTION-
Improper disposal of the equipment may
have serious consequences:
- The burning of plastic components gene-
rates 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 unauthori-
zed 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.
Should you wish to return the tool or appliance yourself to a disposal facility for recycling, proceed as follows:
Dismantle the equipment as far as is possible without special tools.
Separate the individual parts as follows:
Part / assembly Main material Recycling
Housing Plastic Plastics recycling
Control panel, display Various Electronics scrap
Electronics Various Electronics scrap
Batteries Alkaline manganese *
Screws, small parts Steel Scrap metal
*
10. Warranty
Hilti warrants that the product supplied is
free of defects in material and workmanship. This warranty is valid as long as the
product is operated and handled correctly,
cleaned and serviced properly and in
accordance with the Hilti operating instructions, all warranty claims are made within
12 months from the date of the sale (invoice date), and the technical system is maintained. This means that only original Hilti
consumables, components and spare parts
may be used in the product. This warranty
provides the free-of-charge repair or replacement of defective parts only. Parts requiring repair or replacement as a result of
normal wear and tear are not covered by
this warranty.
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 product
for any purpose. Implied warranties of
merchantability or fitness for a particular
purpose are specifically excluded.
For repair or replacement, send the product
and / 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.
Dispose of batteries in
accordance with national
regulations.
Please help to protect our
environment.
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11. FCC statement (applicable in the USA) / Label / 12. EC declaration of conformity
11. 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 relocate the receiving
antenna.
- Increase the separation between the
equipment and receiver.
- Consult the dealer or an experienced
TV / radio technician for assistance.
Changes or modifications not expressly
approved by Hilti could limit the user’s
right to operate the equipment.
Product information plate:
12. EC declaration of conformity
Designation: Laser detector
Type: PRA 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.
Hilti Corporation
Armin Spiegel
Leiter BA Measuring
Head of BA Measuring
Systems
01 / 2004
Bodo Baur
Leiter Qualität
Measuring Systems
Quality Manager BA
Measuring Systems
01 / 2004
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Hilti Corporation
FL-9494 Schaan
Tel.: +423 / 2342111
Fax: +423 / 2342965
www.hilti.com
Hilti = reg. trademark of Hilti Corp., Schaan W2907 1003 Pos. 1 englisch 9 Printed in Liechtenstein © 2003
Right of technical and programme changes reserved S.E.&O.
282846
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