Instruction Manual
K SERIES Cryostorage System
IM: CryoCeK
Revision: 02
Approved by: CB
Page
31
of
87
No
Steps of procedure
Display and notes
steps
Press
key when finished
If the temperature of the thermocouple rises above the set value the solenoid valve is
opened for a short period of time. The disturbance caused by nitrogen gas bubbling
through the liquid causes the temperature to drop rapidly.
If the required temperature is not achieved a further pulse of gas is admitted after a pre-set
time interval. The on time and interval are set up via the CONFIG/CALIBRATION menu.
6
Use the + and - keys to set the maximum
temperature:
the MAX TEMP setting is adjustable
between 0 °C and
–175 °C in 5-degree
steps
Press
key when finished
If the LN2 supply alarm is disabled skip to
step 7
If the LN2 supply alarm is enabled (see
CONFIG/CALIBRATE menu) the following
message (example) will appear:
If the solenoid valve is operated for longer than the displayed time an alarm will be
activated and the solenoid valve will be switched off. Switching off the solenoid valve
reduces the risk of overheating if the LN2 supply fails.
It is also a safeguard against possible masking of the sensors by a build-up of ice. This
situation could cause overfilling of the refrigerator.
A time-out during filling is additionally indicated by the Led blue slow flashing.
To cancel the alarm the LN2 Fill Solenoid Valve (switch 1) must be pressed.
7
Use the + and - keys to set the maximum
fill time:
the maximum FILL TIMER setting is
adjustable between 0 min and 175 min in
5-minute steps
Press
key when finished
The following message (example) will appear:
Simultaneous filling is a method of reducing nitrogen consumption. If a number of
refrigerators are connected for simultaneous filling, and one refrigerator demands LN2 it
sends a signal to the others so that they start to fill also.
This reduces the number of times that the common pipework needs to be cooled and
hence reduces evaporation losses. For further details on simultaneous filling and
interconnection of refrigerators see Appendix F.
In some installations the LN2 supply pressure may be insufficient to feed all of the
