3
The following shows the explanation related to
the key sections of the Standard.
Laser instrument of Class 3R is applicable outdoors
and in construction field (measurement, defining lines,
leveling).
a) Only those persons who are trained with related
course and authenticated are allowed to install, adjust,
and operate this kind of laser instrument.
b) Stand related warning symbols in the scale of use.
c) Prevent any person to look straight at or use optical
instrument to observe the laser beam.
d) To prevent the harm caused by laser, block the
laser beam at the end of the working route. When the
laser beam exceeds the limit area (harmful distance*)
and when there are motivating persons, stopping the
laser beam is a must.
e) The optical path of the laser should be set higher or
lower than the line of sight.
f) When the laser instrument is not in use, take care of
it properly. The person who is not authenticated is not
allowed to use.
g) Prevent the laser beam from irradiating plane mirror,
metal surface, window, etc., especially beware of the
surface of plane mirror and concave mirror.
* Harmful distance means the maximum distance
between the start point and the point which the laser is
weakened to a degree that doesn‟t harm people.
The internal EDM instrument equipped with a Class
3R/III a Laser has a harmful distance of 1000m
(3300ft). Beyond this distance, the laser intensity is
weakened to Class I (Looking straight at the laser
beam causes no harm to the eyes.)
LASER PLUMMET
The laser plummet built into the product produces a
visible red laser beam which emerges from the
bottom of the product. The product is a Class 2/Ⅱ
Laser Product.
Class 2 Laser Product is in accordance with:
IEC 60825-1:1993 "Safety of Laser Products"
EN 60825-1:1994 + AⅡ:1996: "Safety of Laser
Products".
ClassⅡ Laser Product is in accordance with:
FD121CFR ch.1$ 1040:1998 (U.S. Health and
Human Services Secretary, Federal rules code)
Class 2 Laser Products:
Do not stare into the beam or direct it unnecessarily at
other persons. Eye protection is normally afforded by
aversion responses including the blink reflex.
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