XT SERIES
Extended Time Liquid
Nitrogen Refrigerators
TW-345
Operating Instructions
SAFETY
Before using any cryogenic refrigerator, read
Handle with Care booklet provided with the unit.
It details safety precautions that must be under-
stood before using the equipment. If a replace-
ment booklet is needed, order one from your
supplier.
Following a few of the safety precautions
described in the Handle with Care booklet.
Please be sure to read the entire booklet.
Store and use these containers only in well
ventilated areas. In a confined area, nitrogen
gas from these units may cause suffocation by
displacing air needed for breathing. Install a
suitable oxygen monitor.
Do not touch liquid or cold metal surfaces
with your bare skin. The liquid nitrogen
refrigerant in these containers is extremely
cold: –196°C (-320°F). Exposure of skin or
eyes to liquid, cold gas or frosted parts could
result in a severe frostbite-like injury. Because
of the extremely low temperature, a face shield
and gloves must be worn when transferring
liquid nitrogen and material into or out of these
containers.
OPERATION
Filling: Adding liquid nitrogen to a warm con-
tainer may cause splashing and will generate a
significant volume of nitrogen gas as cold liquid
contacts warm refrigerator surfaces. Add liquid
slowly to minimize these effects. Be sure there
is adequate ventilation. Keep you head clear of
the heavy volume of vapor that may be pro-
duced. It is extremely cold and could cause
personal injury.
Warning
DO NOT OVERFILL. Over-filling may result in personal
injury due to liquid spillage.
DETERMINING LIQUID LEVEL
Liquid level must be checked at regular intervals
– refrigeration depends on the presence of liquid
nitrogen. The liquid level in the container can be
determined with a dipstick. Insert the dipstick
straight into the container so that it rests on the
canister positioning fixture on the bottom of the
unit. After 5 to 10 seconds, withdraw the
dipstick and wave it back and forth in the air. A
frost section will form representing the depth of
liquid nitrogen in the container.
WARNING
Never use a hollow rod or tube as a measuring rod. When
a warm tube is inserted into liquid nitrogen, liquid will spout
from the top of the tube and may cause personal injury.
The liquid level chart shows volume of liquid
nitrogen vs. depth for XT Series refrigerators.
These values are approximate and are based on
a standard condition with no stored material in
the container. With stored material, the liquid
volume will be slightly less than the value of the
chart.
INSERTING OR REMOVING CANISTERS
To prevent unnecessary loss of liquid nitrogen
and accumulation of ice, the necktube core (the
stopper) should remain in the container when the
stored material is not being accessed. When
accessing stored material, the necktube core
should be removed as briefly as possible.
When removing material from the canisters,
withdraw the canister just far enough to remove
contents. Completely withdrawing the canister
will unnecessarily expose the stored material to
warm, room temperature conditions.
WARNING
Some canisters have liquid drain opening; some do not. If
canisters are completely removed from the container, liquid
nitrogen may remain in the canister or drain from the
bottom. When removing canisters, stop breifly at the
necktube to allow liquid to drain completely, then handle the
canister carefully to prevent personal injury. Avoid direct
contact with bare skin. The use of proper personal
protective equipment is strongly urged – cryogenic gloves,
face shield and gown – to protect against splashing.
When room temperature product is added,
slowly lower the canister into the refrigerator to
reduce the boiling of refrigerant and the surge of
cold nitrogen gas. When inserting the canister,
tilt the bottom of the canister in the direction of
the index ring notch.
SECURING CONTENTS
The contents of all models may be secured with
a seal or lock through tabs on the edge of the lid
opposite the hinge.
ROUTINE CARE & MAINTENANCE
If ice accumulates inside the necktube, a general
cleaning of the refrigerator should be scheduled
as soon as the stored material can be conve-
niently transferred to another refrigerator. To
clean the unit, first remove stored material, then
Model Liters/inch Liters/cm
XTL3 0.4 0.16
XT10 0.75 0.3
XTL8/XT20 1.41 0.56
XT34 2.67 1.05
(7 pages)
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