CS200
Control Systems
26
Temperature
The temperature in the Cryostorage freezer is measured at the location of the thermocouple. The installation
location is different depending on the model of the freezer but usually the thermocouple is positioned level with
the top storage box. This may mean that temperatures displayed may be slightly warmer than the temperature
experienced by the samples or product stored in the freezer.
Temperature Control
The CS200 SERIES Control System has the capability to control the vapor temperature at the top of the freezer.
The temperature is controlled at the location of thermocouple 1.
To maintain temperature, the CS200 SERIES Control System bubbles nitrogen gas through the pool of LN
2
in
the bottom of the freezer. The nitrogen gas evaporates some of the LN
2
causing a cooling effect and reducing
the temperature in the freezer. Since a pool of LN
2
is important in the process of temperature control, an
adequate level is always maintained by the control systems and the level control always takes precedence over
temperature control. Temperature control will not work if the LN
2
level is above the High Level Alarm.
Enabling the temperature control feature will
always
increase the use of LN
2
. The increased consumption
will depend on a number of factors including the temperature to be maintained, the range of the controlled
temperature, the ambient temperature, the length of supply hose connected to the freezer and the frequency
which users open the lid or otherwise introduce heat.
Battery Operation
The CS200 SERIES Control System is designed to operate with or without an optional battery backup system if
required. Simply plug the battery into the appropriate connector. The control will recognize that the battery has
been connected and will activate the battery backup mode.
LED Status Wheel
The CS200 SERIES Control System offers an
innovative concept called a status wheel. In normal
operation, the LED’s on the status wheel light to
show a slow rotation of the wheel. If an error
condition occurs, the control will alert the user with
an additional visual alarm from the status wheel.
The rotation can be accelerated, flashed or even
illuminated in the opposite direction.
Lid Switch
The lid switch consists of a magnet and a pickup installed on the lid. The control can determine when the lid
is opened because the magnet moves out of range of the pickup and the circuit becomes open. A number of
features are associated with the lid switch such as Auto Defog, Quickchill and the Lid Open Too Long Alarm. If
the lid switch is deactivated, these features are also disabled.
Condition
LED Flash Property
Normal
Clockwise pattern, 1 LED per second
General Error
Clockwise pattern, rapid rotation, flash
Table 4.0 LED Status Wheel Flash Patterns
Controller
Operation
Содержание CS200
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