CS200
Control Systems
18
keypad to define new start and stop levels, and these levels may be set independently to vary the liquid level
deference between fills. Prior to the initial fill of the freezer, a determination should be made whether vapor
phase or liquid phase storage will be utilized.
All units are supplied with an eight-thermistor assembly and a freeze-guard sensor unless otherwise specified.
The LABS factory setting positions will maintain liquid level within a distance of 2 in. (51 mm) from the bottom
of the carousel on the LABS 20K, 38K, 40K, 80K units, and 3 in. (76 mm) from the bottom of the carousel on
the LABS 94K. The K Series factory setting positions will maintain liquid level settings between 3 in. (76 mm)
and 6 in. (152 mm).
Temperature Monitoring
The CS200 SERIES Control System uses a Type T thermocouple to monitor the temperature in the vessel. The
thermocouple is factory-installed near the top of the Worthington Industries Cryostorage freezer vapor chamber
and the temperature is measured at that point.
The CS200 SERIES Control System accommodates a second thermocouple (optional) for temperature
measurement at a secondary location. This requires a Type T thermocouple.
The control provides a High Temperature Alarm for each thermocouple which can be selected by the user.
If the temperature exceeds the temperature alarm set point, the status wheel flashes and an audible alarm is
triggered.
Liquid Phase Storage
Liquid phase storage is normally utilized when (-196°C/-320°F) is required to maintain stored product viability
and the storage medium is adequate for storage in LN
2
. In a typical liquid phase storage system, the liquid
level sensors are positioned to maintain the liquid level at or below the top level of the inventory control
system. During operation, the upper levels of the inventory control system will at times become exposed as the
liquid level fluctuates.
Care must be taken to ensure that the liquid level remains below the bottom of the freezer lid. Exposure
to LN
2
may result in physical damage to the lid. Additionally, operating the freezer with high liquid levels
characteristic of liquid phase storage may result in turbulence during fill cycles. Caution must be exercised if
the freezer lid is opened during a fill, and appropriate safety equipment should always be worn.
The Worthington Industries Cryostorage Systems are factory set for vapor phase storage.
Maintenance
To insure proper operation and maintain excellent performance of the Worthington Industries Cryostorage
freezer, an annual maintenance schedule should be followed for the CS200 SERIES Control System. This would
include the following:
Operation
Summary of Contents for CS200
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