Taylor-Wharton CXR500 - Manual

TW-362
Operating Instructions
SAFETY
Before using any cryogenic refrigerator, read
the Handle with Care booklet provided with the
unit. It details safety precautions that must be
understood before using the equipment. If a
replacement booklet is needed, order
publication TW-10 Handle with Care from your
supplier.
Following are 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.
Use only the necktube core supplied with this
unit or a listed replacement part. A tight fitting
plug or stopper will cause a pressure increase in
the container that may damage the container
and/or cause personal injury.
Dispose of liquid nitrogen only in areas
specifically designed for that purpose.
Disposal of liquid nitrogen should be done
outdoors in a safe place. Pour the liquid slowly
on gravel or bare earth where it can evaporate
without causing damage.
OPERATION
Important note: Before filling the CXR series
for the first time, record the tare weight and
serial number of each container. Recording the
“as received” tare weight on the container
itself is recommended.
Filling: Adding liquid nitrogen to warm container
may cause splashing and will generate a sufficient
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 your head clear of the heavy
volume of vapor that may be produced. It is
extremely cold and could cause personal injury
WARNING
DO NOT OVERFILL. Over-filling may result in
personal injury due to liquid spillage.
With regular usage, moisture can
accumulate in the refrigerator as a result of
lowering a frosted canister back into the
shipping cavity. This moisture will displace
nitrogen in the adsorbent material on the
subsequent filling and effect the overall
holding time.
CAUTION:
When filling the Cryogenic Refrigerator,
avoid liquid nitrogen coming in contact with
the vacuum plug. In order to accomplish this,
the Cryo-Exchange must be removed from
its shipping carton during the “fill” operation.
Remove the unit from its shipping
enclosure. Set the unit on a scale and fill
the refrigerator with liquid nitrogen to about
half way up the necktube. Allow the unit to
stand undisturbed while the liquid is being
adsorbed. About every five minutes, add
liquid to maintain the level half way up the
necktube as the liquid is adsorbed by the
filler material. This procedure can take four
or more cycles. Replace the necktube core
and allow it to “float” on the liquid. Allow the
unit to stand undisturbed for 18 to 24 hours
while the liquid is being adsorbed. After this
point, the quantity of liquid standing in the
central cavity of the refrigerator must be
poured out to prevent spillage during
shipment. To assure a complete fill, the dry
CXR100 weight should increase by
approximately 6.5 lb. (3.0 kg) and the dry
CXR500 weight should increase by
approximately 11.5 lb. (5.2 kg).
The material to be stored in the Cryo-
Exchange refrigerator, as well as the
canister or rack, should be pre-cooled before
being placed in the shipper. When the
refrigerator is fully charged, place the pre-
cooled canister and lower it into the
necktube. Install the necktube core and cap
to hold the canister in place.
CAUTION:
When the Cryo-Exchange is in use, it must
be kept upright. When properly filled, there is
no concern for liquid refrigerant spills.
However, holding time will be drastically
reduced when the refrigerator is on its side.
Securing contents: The contents of all
models may be secured with a seal or lock
through tabs on the edge of the lid.
ROUTINE CARE AND MAINTENANCE
Do not attempt to fasten any device to the
container. Welding, brazing, or piercing of the
container in any manner will cause
permanent damage.
Cryo-Exchange Vapor Shippers
With Replaceable Adsorbent