17
Permissible UV Exposure Levels
Danger
To avoid exposure to UV radiation, always turn off the UV system (see
Shutting Down the
Entire UV System
on page 18) if any of the machine covers is opened for more than six
minutes.
Permissible exposure time in seconds for exposure to actinic ultra-violet
radiation incident upon the unprotected skin or eye may be determined with
reference to table above, which provides exposure times corresponding to
effective irradiance in micro watts/cm
2
.
Table 1. Permissible Ultra Violet Exposures As Recommended By The American
Conference Of Government And Industrial Hygienists
Duration of Exposure (per day)
Effective Irradiance E Micro
Watts/cm sq.
8 hours
0.1
4 hours
0.2
2 hours
0.4
1 hours
0.8
30 minutes
1.7
15 minutes
3.3
10 minutes
5.0
5 minutes
10
1 minute
50
30 seconds
100
10 seconds
300
1 second
3000
0.5 seconds
6000
0.1 seconds
30000
