Instruction Manual
K SERIES Cryostorage System
IM: CryoCeK
Revision: 02
Approved by: CB
Page
55
of
87
8.2 INSPECTION AND MAINTENANCE SCHEDULE
IMPORTANT
The following safety precautions apply to the Worthington Industries K SERIES
Cryostorage System:
If
your K SERIES Cryostorage System
is to be taken out of service for any
reason, the following steps must be performed to safely take the
refrigerator out of operation:
Disconnect electrical power and liquid nitrogen supply.
Remove all stored samples and the inventory control system, including the bottom
platform.
Remove sensors.
Use a source of dry nitrogen gas to purge the refrigerator as the temperature rises
to ambient.
The purge gas can be installed on the sensor tube or fill tube or directly into the
liquid via a tube or hose after the appropriate components have been removed. The
purge gas may also simply be delivered to the refrigerator through a bent metal tube
under the lid.
A flow rate of 8 to 17 m3/h regulated at 0.3 to 0.5 bar is sufficient to prevent water
from collecting inside the refrigerator. This flow of purge gas will also speed the
warming of the refrigerator to ambient temperature.
NOTE
For further detailed instructions see the subsequent sections.
Worthington Industries strongly recommends to inspect and maintain your K SERIES Cryostorage
System as follows:
Table 11
Recommended inspection and maintenance schedule
Inspection and maintenance activities
Frequency
Check any alarm messages on the controller display for necessary actions
Daily or via remote
alarm (if used)
Inspect cables,
wires and connectors of solenoid valve, lid switch, level
sensor assembly, thermocouple assembly, level control system, power
supply for
any connecting problems, cracks or other damages
Annually (at least)
Clean the strainer as per section 8.3
Annually or whenever
the ice buildup
exceeds approx. 5mm
