3D Systems ProX DMP 200, Руководство пользователя

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15 3D SYSTEMS, INC .
GAS SAFETY
The DMP system use inert gas (Nitrogen, Argon) as a cover gas to create an inert atmosphere in the print chamber. The
cover gas inhibits any potential rapid combustion of particulate matter during the DMP process.
The oxygen content of air is approximately 21 percent. Displacement of the normal atmosphere with an inert gas can
reduce the oxygen content in a room. In the remote chance that an inert gas leaks into the room during the sintering
process, the situation can be hazardous.
3D Systems recommends that you have an oxygen monitor installed in the room containing the DMP system. This monitor
will alert you if the oxygen level drops below a designated point.
WARNING: BECAUSE ARGON IS HEAVIER THAN AIR, 3D SYSTEMS RECOMMENDS INSTALLING THE OXYGEN
MONITOR CLOSE TO THE FLOOR TO DETECT ARGON POOLING .
WARNING: EXPOSURE TO AN ATMOSPHERE CONTAINING 12 PERCENT OR LESS OXYGEN CAUSES
UNCONSCIOUSNESS WITHOUT ANY WARNING SYMPTOMS . THIS HAPPENS SO QUICKLY THAT YOU CANNOT
HELP OR PROTECT YOURSELF .
The table of Oxygen Deprivation Effects and Symptoms explains the potential effects and symptoms that can occur at
different concentrations of oxygen in the atmosphere.
When you work in an environment that may become oxygen-deficient, make sure you comply with the following items:
•
If, at any time, you feel you are experiencing symptoms of oxygen deprivation, leave the area immediately.
• You have received oxygen safety training.
• The room is well-ventilated; at least 4 air exchanges per hour.
• Self-contained breathing apparatus is available and easily accessible.
• The room oxygen alarm monitor is functioning and audible.
• Leave the DMP system room/area immediately when you hear the oxygen alarm.
Oxygen Deprivation Effects and Symptoms
OXYGEN CONTENT
(% BY VOLUME)
EFFECTS AND SYMPTOMS AT ATMOSPHERIC PRESSURE
a
15 – 19 %
Decreased ability to work strenuously. May impair your coordination or may induce
early symptoms in persons with coronary, pulmonary, or circulatory problems.
12 – 14 %
Increases respiration during exertion. Pulse rate goes up. May experience impaired
coordination, perception, and judgment.
10 – 12 %
Respiration continues to increase in rate and depth. Lips become blue. May lose
consciousness at this point.
8 – 10 %
Mental failure. Fainting and unconsciousness. Face becomes ashen, lips become
blue. Nausea and vomiting may occur.
6 – 8 %
100% fatal after 8 minutes of exposure.
50% fatal within 6 minutes.
Recovery with treatment within 4 to 5 minutes.
4 – 6 % Coma within 40 seconds; convulsions, respiration ceases, death occurs.
a. From Safety Bulletin SB-2 - 1983—”1983 by the Compressed Gas Association, Inc. 1235 Jefferson Davis Highway, Arlington,
VA 22202