Omron Z4LB V2 Instruction Manual page 21

Laser Safety
Comparison of Classifications between FDA and ANSI
Class
Class Limits applicable to devices that have
I/1 emissions in the ultraviolet, visible, and
infrared spectra, and limits below which
biological hazards have not been estab-
lished.
Class Limits applicable to products whose visible
IIa/2a emission does not exceed Class I limits for
emission durations of 1,000 seconds or
less and are not intended for viewing.
Class Limits applicable to products that have
II/2 emissions in the visible spectrum (400 to
710 nm) for emission durations in excess
of 0.25 second, providing that emissions
for other durations and/or wavelengths do
not exceed the Class I limits. Class II prod-
ucts are considered hazardous for direct
long-term ocular exposure.
Class Limits to products that have emissions in
IIIa/3a the visible spectrum and that have beams
where the total collectable radiant power
does not exceed 5 milliwatts.
Class Limits applicable to devices that emit in the
IIIb/3b ultraviolet, visible, and infrared spectra.
Class IIIb products include laser systems
ranging from 5 to 500 milliwatts in the vis-
ible spectrum. Class IIIb emission levels
are ocular hazards for direct exposure
throughout the range of the Class, and
skin hazards at the higher levels of the
Class.
Class Exceeding the limits of Class IIIb and are a
IV/4 hazard for scattered reflection as well as
for direct exposure.
FDA definition ANSI description
A Class 1 laser is considered to
be incapable of producing dam-
aging radiation levels during op-
eration and maintenance and is,
therefore, exempt from any con-
trol measures or other forms of
surveillance.
Class 2 lasers are divided into
two subclasses, 2 and 2a. A
Class 2 laser emits in the visible
portion of the spectrum (0.4 to p p
0.7 µm) and eye protection is
0 7 ) d t
normally afforded by the aver-
sion response including the
blink reflex.
Class 3 lasers are divided into
two subclasses, 3a and 3b. A
Class 3 laser may be hazardous
under direct and specular re- p
flection viewing conditions, but fl ti i i diti
the diffuse reflection is usually
not a hazard.
A Class 4 laser is a hazard to
the eye or skin from the direct
beam and sometimes from a dif-
fuse reflection and also can be
fire hazard. Class 4 lasers may
also produce laser-generated
air contaminants and hazardous
plasma radiation.
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