2
1
Please observe the following (continued)
3. Potentially exposed skin should be covered. Long sleeves and protective gloves should be
worn when placing and removing parts from under the lamp.
4. Never look directly at the output from the lamp or directly into the lamp/reflector.
5. Removing the glass filter from the lamp housing may speed up the cure of some products,
however, this will also speed injury to eyes and unprotected skin. DO NOT OPERATE THE
LAMP WITH THE FILTER REMOVED.
UV safety is the responsibility of the user, especially when operating the unit in a non-standard
configuration. When in doubt about UV safety, consult a Loctite technical specialist at
1-800-LOCTITE OR 1-800-562-8483.
1.3.2
Ozone Safety
A secondary hazard is the ozone (O
3
). Ozone is generated by reaction of UV light of wavelength
< 240 nanometers with atmospheric oxygen. Use this equipment with adequate ventilation.
The current (Feb. 1999) threshold limit value (TLV) for ozone is 0.1 ppm (parts per million).
There are several techniques for monitoring ozone concentrations. One of the simplest, is
equipment supplied by National Draeger, Inc., of Pittsburgh, PA. Their devices employ a direct
reading, disposable detection tube which is capable of measuring ozone concentrations of 0.05
ppm to 14 ppm.
Ozone concentrations can be minimized with good local ventilation. Ozone generation can be
prevented entirely by the use of an oxygen-excluding nitrogen atmosphere under the lamp or by
using an “ozone free” lamp. “Ozone free” lamps have a quartz sleeve or tube which blocks
wavelengths < 240 nanometers. See the Spare Parts List on page 10 of this manual for the part
number of the “ozone free” lamp.
1.3.3
Thermal Safety
A third safety concern with medium-pressure mercury light sources is heat. UV lamps generate
significant amounts of energy in the infrared region. Infrared radiation heats all nearby objects. In
addition, the quartz sleeve of the UV lamp must be maintained at between 600°C and 800°C to
vaporize the mercury in the lamp. The user must supply sufficient cooling and/or heat shielding
to keep the system at a safe temperature for the operators. The cooling must also keep the parts
being cured at a safe operating temperature.
1.3.4
Electrical Safety
1. Connect the unit to a three-wire (grounded) outlet with correct ampere capacity.
2. The power supply enclosure contains a high voltage transformer which supplies high lamp
starting voltages. This unit should be serviced only by qualified electricians or by a Loctite
Service Technician.
