StoreX
Series
STX_V078.doc
50
CMa,
23.11.2009
On vaporization Nitrogen expands by a factor of 700; one liter of liquid nitrogen
becomes 24.6 cubic feet of nitrogen gas. This can cause the
explosion
of a
sealed container, or it can displace oxygen in the room and cause
suffocation
without warning
. Nitrogen can also become oxygen enriched and cause
ordinarily noncombustible materials to burn rapidly.
In case of an accident evacuate all personnel from the affected area. Persons
suffering from lack of oxygen should be removed to fresh air. If victim is not
breathing, use trained personnel to administer a supplemental oxygen supply
and artificial respiration to support vital functions. If breathing is difficult,
administer oxygen. Victim and rescuers must seek immediate medical attention.
Ventilate area and attempt to shut off the release of gas by tightening the main
valve. If it is not possible to stop the release of gas, allow the gas to be released
there. If leaking from cylinder or its valve, contact your supplier. Monitor area for
a minimum of 19.5% oxygen content before allowing re-entry by personnel.
In case of frostbite, restore tissue to normal body temperature, 37°C (98.6°F),
followed by protection of the injured tissue from further damage and infection.
Immediately place the frostbitten part in warm water (not to exceed 40°C) or wrap
affected parts gently in blankets. Under no circumstances should the water be
over 44°C (112°F), nor should the frozen part be rubbed either before or after re-
warming. Remove or loosen clothing that may constrict blood circulation to the
frozen area. In case of massive exposure, remove clothing while showering the
area with warm water. Encourage victim to gently exercise the affected part
while being warmed. Call a physician. The patient should neither smoke, nor
drink alcohol.
6.4.8
Principles of Operation of Gassing Options
Continuous Flow System
The Continuous Flow System is the simplest implementation of the gassing
option. The use of this solution is limited to low-accuracy applications where the
incubation chamber has to be filled with a specific gas or where a gas inside the
chamber has to displaced. In some applications pre-mixed gas may be used. The
gas flow is adjusted to a value that generates the specified atmosphere. This
value is determined experimentally by the user. In most cases the low costs of
this solution will quickly be compensated by the costs caused by the excessive
gas consumption and / or additional safety requirements needed in conjunction
with this solution.
A pressure limiter and a flow limiter protect the system from inlet pressure
fluctuations and make it relatively insensitive to the amount of input pressure.
This solution is adequate for very low demanding applications and for non toxic
gases. Note that a significant amount of gas may be emitted to the instrument’s
environment.
Pressure
Limiter
Gas Inlet
Flow Limiter
Incubation
Chamber
Exhaust
Flow Regulator
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