3 Technical data
Right of technical changes reserved.
PRA 20G
Detection range (area diameter)
With the PR 3-HVSG (typical): 2…150 m (6 ... 475 ft)
Signal tone generator
3 volume levels plus mute setting
Liquid-crystal display
On both sides
Indicator range, distance from zero
± 52 mm (± 2 ¹/₃₂ in)
Laser plane display range
± 0.5 mm (± ¹/₆₄ in)
Length of the receiving window
120 mm (4 ¹/₃₂ in)
Center indication from top edge of casing
75 mm (3 in)
Marking notches
On both sides
Time without detection before automatic power off
15 min
Weight (including batteries)
0.25 kg (0.55 lbs)
Power source
2 AA‑size batteries
Battery life
Tempe20°C (68°F): approx. 50 h (depending on
the quality of the alkaline batteries used)
Operating temperature range
-20…+50°C (-4° F ... 122° F)
Storage temperature
-25…+60°C (-13° F ... 140° F)
Protection class
IP 66 (in accordance with IEC 60529); except the bat-
tery compartment
Drop test height
1
2 m (6.5 ft)
1 The drop test was carried out using the PRA 83 receiver holder, dropped onto flat concrete under standard ambient conditions
(MIL-STD-810G).
4 Safety instructions
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.
4.2 General safety rules
a)
Keep other persons, especially children, away
from the area in which the work is being carried
out.
b)
Check the condition of the tool before use. If the
tool is damaged, have it repaired at a Hilti Service
Center.
c)
Do not render safety devices ineffective and do
not remove information and warning notices.
d)
The tool must be checked at a Hilti service center
after it has been dropped or subjected to other
mechanical stresses.
e)
If mounting on an adapter, check that the tool is
fitted correctly.
f)
To avoid measurement errors, the receiving area
must be kept clean.
g)
Although the tool is designed for the tough condi-
tions of jobsite use, as with other optical and elec-
tronic instruments (e.g. binoculars, spectacles,
cameras) it should be treated with care.
h)
Although the tool is protected against the entry of
moisture, it should be wiped dry before being put
away in its transport container.
i)
Operation of the tool close to the ears may cause
hearing damage. Do not position the tool close to
the ears.
4.2.1 Electrical
a)
Keep the batteries out of reach of children.
b)
Do not allow the batteries to overheat and do not
expose them to fire.
The batteries may explode or
release toxic substances.
c)
Do not charge the batteries.
d)
Do not solder the batteries into the tool.
e)
Do not discharge the batteries by short circuiting
as this may cause them to overheat and present
a risk of personal injury (burns).
f)
Do not attempt to open the batteries and do not
subject them to excessive mechanical stress.
en
10
Printed: 11.04.2016 | Doc-Nr: PUB / 5206975 / 000 / 01
