15
CS200
Control Systems
The LN
2
level is indicated on the display and is determined by the number of
thermistors submerged in LN
2
according to the table below:
Table 1.0 8-Thermistor Sensor (G=GAS, L=LIQUID)
Alarm Conditions
The CS200 SERIES Control System monitors a number of conditions and provides an
alarm if a problem is detected. The alarms are listed below:
Table 2.0 Alarm Conditions
8-THERMISTOR SENSOR
#1
#2
#3
#4
#5
#6
#7
#8
OFFSET
DISPLAY
G
G
G
G
G
G
G
G
0
0
L
G
G
G
G
G
G
G
0
1
L
L
G
G
G
G
G
G
0
2
L
L
L
G
G
G
G
G
0
3
L
L
L
L
G
G
G
G
0
4
L
L
L
L
L
G
G
G
0
5
L
L
L
L
L
L
G
G
0
6
L
L
L
L
L
L
L
G
0
7
L
L
L
L
L
L
L
L
0
8
Note: Please see
description of
the offset. Level
displayed may vary
depending on the
offset setting.
Alarm
Problem Detected
Low Level Alarm
LN
2
level is too low. The low level alarm thermistor on the sensor assembly is not
submerged in LN
2
.
High Level Alarm
LN
2
level is too high. The high level alarm thermistor on the sensor assembly is
submerged in LN
2
.
Sensor Error Alarm
A problem exists with the level sensor assembly. The control detects an open sensor
circuit meaning that the sensor is unplugged or the sensor assembly has been
damaged. A Sensor Error will be represented by an “O” within the Thermistor Status
menu.
High Temperature Alarm
The temperature detected is warmer than the high temperature alarm setting.
Low Temperature Alarm
The temperature detected is colder than the low temperature alarm setting.
Thermocouple Calibration
Alarm
The calibration data is incorrect.
Thermocouple Open Alarm
A problem exists with the temperature sensor (thermocouple). The control detects an
open circuit meaning that the sensor is unplugged or the sensor assembly has been
damaged.
Power Failure
No Power.
Low LN
2
Supply Alarm
A problem may exist with the LN
2
supply connected to the freezer. This alarm occurs
if the freezer does not fill within the designated amount of time as determined by the
setting on the control. This may occur for a number of reasons including an empty
supply cylinder, low pressure in the supply cylinder or a closed shut off valve.
Operation
NOTE - Offset value for LABS94K only = 3.0 in (126 mm).
Summary of Contents for CS200
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