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This equipment is designed to operate in the following environmental conditions:
Temperature: 5°C (41°F) to 40°C (104°F)
Humidity: 80% at ≤ 31°C, decreasing linearly to 50% at 40°C
Altitude: ≤ 2,000 meters (6,650 feet)
As a rst step in the set-up procedure, be sure to read this manual completely to become more familiar
with this equipment. Next, remove all packing materials and wipe unit with a clean cloth inside and out to
remove any debris left from shipping. Once the unit is wiped down, complete the following Steps: (Note: The
Temp A/Temp B alarm is set at +30°C from the factory. Thus, it will not alarm during the rst ll and must
be set by the user once the freezer cools.(-150°C)
1. (Connect the LN
2
stainless steel exible hose from the supply tank to the storage freezer), but do not open
the manual supply valve until instructed to do so.
2. Connect Remote Alarm or Auto Dialer if desired.
3. Plug unit into an appropriate power source.
4. Turn the power key switch to the “ON” position and the program/lock to program.
5. Adjust the Liquid Level Set points. See display #4 on page 16 for instructions.(press LIQ’D level)
6. Adjust the High Temperature Alarm Set point after lling is complete. See display #5 on page 16 for
instructions. (press “TEMP”)
7. Open the manual valve on the supply tank. Check for leaks at the connection points, then proceed to
normal operation.
The S Series Storage Units are designed to maintain liquid nitrogen levels within specied parameters inside
a cryogenic storage vessel. The V Series Storage Units are designed to maintain liquid nitrogen levels within
specied parameters inside the walls of a cryogenic storage vessel. This is achieved by measuring gravitational
weight of the liquid nitrogen with a pressure sensing unit in the controller. The controller activates the FILL
solenoid valve when the liquid level goes below the LOW level set point, and deactivates the solenoid valve,
stopping the ll, when the level reaches the HIGH set point.
The Bypass Function has an additional solenoid valve to vent vapor from the transfer lines before the
FILL solenoid is activated. In the description below, the part of the sequence which is unique to the Bypass
Function is in [brackets]. All other information refers to units with or without the Bypass Function.
During regular operation, the sequence of events is as follows: When the liquid level in the vessel falls
below the low level set point, a signal is sent to the controller. At this time the FILL solenoid valve is activated,
allowing the ow of liquid into the vessel. [The Bypass Function will activate the VENT solenoid rst to release gas
or vapor from the transfer lines. The venting will continue until the line temperature reaches approximately -150° to
-160°C. This can be adjusted, consult the factory for more information. When the line reaches this temperature the
vessel will begin to ll.] When the liquid level reaches the high level set point a signal is sent to the controller
which deactivates the solenoid valve and stops the ow of liquid into the vessel. As long as the unit is powered
up, this ll sequence repeats as necessary, maintaining the desired liquid level.
Check unit daily to ensure proper operation and safety of the stored samples. For the V Series units, it is
essential to lift the lid each day and check for vapor and signs of proper freezing.
Whenever working with Liquid Nitrogen in an enclosed space,
the use of personal O
2
detection equipment is recommended.
Storage units should not be disconnected
from their supply while attempting to ll.
INITIAL SET-UP
OPERATION
Lid must be open for rst ll cycle
Go to custombiogenics.com/technicalguides.html
for more information.
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