Taylor-Wharton CX Series - Manual

CX SERIES
Cryo-Exchange V
apor Shippers
TW-347
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 publica-
tion TW-10 Handle with Care from your sup-
plier.
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 of 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 CX 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 a warm
container may cause splashing and will gener-
ate 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 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 absor-
bent materials 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 enclo-
sure. Set the unit on a scale and fill the
refrigerator with liquid to the bottom of the
necktube. Then allow the unit to stand undis-
turbed while the refrigerant is being absorbed.
About every five minutes, add liquid to main-
tain the refrigerant level as the liquid is
absorbed by the filler. This procedure can take
ten to fifteen cycles. When the liquid levels
remains at the bottom of the necktube, the
shipper is full. At 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 com-
plete fill, the dry CX100 weight should in-
crease by approximately 7.9 lb. (3.7 kg) and
the dry CX500 weight should increase by
approximately 11.5 lb. (5.2 kg).
The material to be stored in the Cryo-Ex-
change 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 material to
be stored in 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 refrigerant
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.