CBS S1500 - Initial Set-Up; Operation

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- Initial Set-up -
The S Series Storage Units are designed to maintain liquid nitrogen levels within specified
parameters inside a cryogenic storage vessel. The V Series Storage Units are designed to
maintain liquid nitrogen levels within specified 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 setpoint, and deactivates the solenoid valve, stopping
the fill, when the level reaches the HIGH setpoint.
Units equipped with the Bypass Option have an additional solenoid valve to vent vapor or gas
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 Option is in [brackets]. All other information
refers to units with or without the Bypass Option.
During regular operation, the sequence of events is as follows: When liquid level in the vessel
falls below the low level setpoint, a signal is sent to the controller. At this time the FILL solenoid
valve is activated, allowing the flow of liquid into the vessel. [The Bypass Option will activate
the VENT solenoid first
to release gas or vapor from the transfer lines. The venting will continue
until the line temperature reaches approximately -130˚ to -140˚ C. This can be adjusted, consult
the factory for more information. When the line reaches this temperature the vessel will begin
to fill.] When the liquid level reaches the high level setpoint a signal is sent to the controller
which deactivates the solenoid valve and stops the flow of liquid into the vessel. As long as the
unit is powered up, this fill 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.
- Operation -
As a first 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:
1) Connect LN
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supply to the storage unit, but do not 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 Keyswitch to the "ON" position.
5) Adjust the Liquid Level Setpoints. See display #16 on page 20 for instructions.
6) Open the manual valve on the supply tank. Check for leaks at the connection points, then
proceed to normal operation.
7) 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.