Page 17 Leica EM TIC 3X Operating Manual 07/17
air will be taken up in exchange for nitrogen. LN
2
with high liquid oxygen content has
a faintly bluish colour. Concentrated liquid oxygen promotes vigorous burning!
Make sure that your Dewar vessel is filled only with LN
2
. Apply a note in the central
distribution place stating clearly
ONLY LIQUID NITROGEN
or similar if different liquefied gases are delivered from there. Check the colour of
cryogen: Bluish colour indicates the presence of a high percentage of liquid oxygen.
The concentration of liquid oxygen increases during long periods of storage as its
boiling point (-183 °C) is higher than the boiling point (-196 °C) of LN
2
.
Main supply must be assured: 100
– 240 VAC, 50 / 60 Hz.
The instruments are equipped with protected ground. Before connecting it to the local
electrical supply make sure that the mains has the required ground and that the
instrument is connected to it according to the local regulations.
Unplug the instrument before installing or changing fuses.
HAZARD WARNING
LIQUID NITROGEN, LN
2
Suffocation
-
Any vessel containing LN
2
is a potential hazard
-
One litre LN
2
produces 700 litres N
2
gas
-
N
2
gas is odourless and tasteless
-
Oxygen levels can quickly drop in confined spaces due to displacement of oxygen
-
by N
2
when using or dispensing large volumes of LN
2
-
This can cause immediate fainting and unconsciousness
-
Always use LN
2
in well-ventilated areas
-
Treat it with respect!
Storage
-
For reasons mentioned above do not store full LN
2
Dewars in confined
spaces
Burns
-
LN
2
boils at -196 °C. It is extremely cold and can cause serious burns. Please
read the safety instructions provided with all Leica products for the correct
handling of liquid nitrogen!
