dymax UVC-5, Руководство пользователя

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USE R GUI DE | UVC -5 CO NVE Y OR 8
3. Safety instructions
The mini UV laboratory dryer BE 7 complies with
the state of the art and recognized safety rules.
Nevertheless, it may give rise to risks.
Danger: High voltage!
The UV bulb is operated with an ignition voltage of
approx. 2800 V - 4500 V. Always press the main
switch to disconnect the device from the electrical
system and pull the plug before carrying out any
work on the system, especially before replacing the
UV bulbs! Danger to life! After switching off, wait for
approx. 3 minutes to let the capacitors discharge!
Safety information!
Use the mini UV laboratory dryer only if it is in
perfect condition and observe the operating
manual.
3.1 UV radiation
3.1.1 Indirect effect of the UV radiation,
generation of ozone
Ozone is generated by UV radiation with a
wavelength of less than approx. 200 nm as
a consequence of the dissociation of
molecular oxygen. Ozone in a specific
concentration is a toxic gas. Ozone can
damage the mucous membranes.
Concentrations of 0,1 to 0,2 ppm for several
hours can cause headache, pains in the
chest and dryness and irritation of the upper
respiratory tract.
Therefore, make sure that the ozone-
containing air is extracted and guided to the
outside. The ozone rapidly dissociates into
oxygen.
3.1.2 Effect of UV radiation on the skin
Everybody knows the effect of an acute
overdose in form of a sunburn which
normally remains an unpleasant memory.
Along with intensity of radiation, the
spectrum is very important for damage.
Spectra of the UV bulbs
Most of the UV bulbs used emit approx. 30% UV
radiation, 15% visible light and 55% infrared (heat).
The UV radiation is emitted in different spectra. The
UV radiation of the UV bulbs can be classified in:
UV-A (315-400 nm), UV-B (280-315 nm), UV-C
(100-280 nm). The percentage of each wavelength
range depends on the doping of the UV bulb and is
indicated in the respective data sheet.
Figure 3.
Skin Incision
Different spectra have different effects on the skin
UV-A
•
Direct pigmentation
• Damages the collagens in the skin
• Increased risk of melanoma due to
formation of free radicals
•
Low risk of erythema (sunburn)
UV-B
• Indirect pigmentation
• Strong erythema effect (= high risk
of sunburn)
•
Formation of anti-rachitic
cholecalciferol (vitamin D3)
UV-C
•
Very deep penetration into the skin
• Sunburn caused by UV-C abates
the next day (=no long-term
damages due to sunburn and its
consequences)