17
CS200
Control Systems
Solenoid Valve
These units are designed to work with 12 VDC solenoid valve (see Figures 17.0, 17.1, and 17.2 Plumbing
Assemblies on page 42).
Thermocouples
Type T thermocouples monitor the temperature in the freezer. The user may choose to use NONE, 1 or 2
thermocouples with this control at any time. (The unit comes complete with one Thermocouple)
Power Supply
A 12 VDC power supply is supplied for the CS200 SERIES Control System. This system is supplied with a
universal power supply that accepts 100/240 VAC (50/60 Hz). UL approval for the system as a whole is not
required since the control operates on low voltage. If your power source differs, or is subject to disruption or
line surges due to other equipment on line, consult your Worthington Industries representative.
Remote Alarm
If an error condition occurs after a user defined period of time, a remote alarm can be initiated. This is
accomplished by connecting a remote device to the remote alarm jack on the rear electrical panel. The 3-pin
jack on the back of the unit provides continuity between pin #2 (common) and pin #3 in the normal condition.
Continuity between pin #1 and pin #2 is provided in an error condition.
Figure 4.0 Remote Alarm Plug Connection
Operating Parameters
When materials are immersed in LN
2
, they will assume the temperature of the liquid (-196°C/-320°F). When
material is stored in the vapor phase over the liquid, the liquid nitrogen vapor is still a very cold refrigerant,
but the freezer’s interior temperature increases as product is stored higher above the liquid. This temperature
differential is not significant for many biological storage applications, and is affected by the amount of product
stored in the freezer, the type, size and material of the inventory control system, and the liquid level in the unit.
The liquid level in the freezer is determined by the position of the of the Thermistor Assembly in the sensor tube.
These sensors are set at installation to maintain a specific liquid level. A filling cycle is initiated when the level
falls below the Start Fill sensor and is completed when the Stop Fill sensor is reached. This filling cycle repeats
when the level fall below the Start Fill sensor. Sensor Probe assignments may be changed on the controller
Operation
Remote Alarm Connector
Summary of Contents for CS200
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