Taylor-Wharton 24K w/ AutoTend - Manual (Page 11)

Temperature Gradient Suppression System
Most Taylor-Wharton CryoStorage units include a Temperature Gradient Suppression
System. The Temperature Gradient Suppression System is a thermal conductor
designed to conduct heat downward toward the nitrogen reservoir, and by doing so,
will significantly reduce the temperature gradient between the top of the inventory
control system and the nitrogen reservoir.
While specific temperature profiles will vary with the use of the refrigerator and the
type of inventory control system used, the Temperature Gradient Suppression
System is an effective way to lower the temperature underneath the refrigerator lid
without noticeably increasing liquid nitrogen consumption.
The chart below represents typical temperature gradients within a Taylor-Wharton
CryoStorage System utilizing the Temperature Gradient Suppression System.
Adding an Inventory Control System
The purpose of the inventory control system is to bring order to the storage of many
small samples, and to allow direct retrieval of the particular sample you need at any
time. It is important to be aware that when you lift an ICS rack from the refrigerator it
is in a warmer environment. Learn to locate your sample quickly to avoid unneces-
sary warming of your stored product.
Keep ICS inserts (drawers or boxes) and dividers in good repair. Replacement inserts
and dividers are available from your Taylor-Wharton distributor to keep your system
as efficient as possible.
Always wear gloves when handling ICS racks or stored product, as they are very cold
– read the precautions in the Safety section of these instructions, and in Taylor-
Wharton publication TW-10 “Handle With Care”, for more detail on handling product
stored in liquid nitrogen.
NOTE:
Temperature Gradient
Suppression Systems are
specifically designed for use in
vapor phase applications and
will be of little value when
liquid phase storage is used.