Taylor-Wharton CS Series - Manual (Page 14)

12
CS SERIES
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=NORMAL, L=LN
2
Flow)
#1 #2 #3 #4 #5 #6 #7 #8 Offset Display Actions
G G G G G G G G 0 0 Low Alarm, Filling
L G G G G G G G 0 1 Low Alarm, Filling
L L G G G G G G 0 2 Filling
L L L G G G G G 0 3 Normal
L L L L G G G G 0 4 Normal
L L L L L G G G 0 5 Stop Fill
L L L L L L G G 0 6 High Alarm
L L L L L L L G 0 7 High Alarm
L L L L L L L L 0 8 High Alarm, Valve
stuck Open Alarm
Alarm Conditions
The CS 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
ALARM PROBLEM DETECTED
Low Level Alarm LN
2
level is too low. Thermistor #2 on the sensor assembly is
not submerged in LN
2
.
High Level Alarm LN
2
level is too high. Thermistor #6 on the sensor assembly
is submerged in LN
2
.
Sensor Error Alarm A problem exists with the level sensor. The control detects an
open sensor circuit meaning that the sensor is unplugged or
the sensor assembly has been damaged. A faulty sensor is
denoted as “O” for open.
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 determined by the setting
on the control. Possible reasons include an empty supply
cylinder, low head pressure in the supply cylinder or a closed
shut off valve.
LN
2
Use Warning The consumption of LN
2
has increased and should be
checked.
Note: Please see
description of the offset.
Level displayed may vary
depending on the offset
setting.