Taylor-Wharton KRYOS Controller - Manual (Page 14)

12
KRYOS
CONTROLLER OPERATION
This section of the operating manual is for Taylor-Wharton approved equipment that
uses the KRYOS controller.
Introduction
The KRYOS temperature and LN
2
level controller is designed for easy operation
and uninterrupted, reliable service. This controller will maintain the selected
liquid level range of LN
2
in your refrigerator as well as provide audible and
visual alarms for any alarm conditions that may occur. An Alarm is any condition
outside the activated preset limits on the control, such as an open sensor circuit or
temperature alarm. “System Events” are lid openings and closings, solenoid valve
openings and closing, and operation of the controller’s relay for remote alarm
indication. System Events, Alarms and Temperature “Data” can be downloaded.
The KRYOS controller should require no additional attention to maintain
liquid level if an adequate supply source of liquid nitrogen is maintained. If
your protocol calls for you to “top-off” the Cryostorage System at the end of
a workday or workweek, press the FILL button. The unit will fill to the upper
allowable liquid level and stop automatically. You may choose to manually stop
the fill by pressing the STOP button at anytime during the fill.
Normal Fill Cycle
When the refrigerator is filled and the controller is operating, the START FILL and
LOW ALARM sensors are immersed in liquid nitrogen. Their resistance values
are interpreted by the controller as “in liquid”. At the same time, the STOP FILL
and the HIGH ALARM sensors are above the liquid pool, informing the control
that these sensors are in vapor. As liquid nitrogen evaporates, the liquid level
in the refrigerator drops slowly until the START FILL sensor is above the liquid
and sends a different signal to the controller. After a delay sufficient to ensure
the signal, the controller interprets this condition as low liquid and opens the fill
solenoid, admitting more liquid nitrogen from the supply source.
The refrigerator will fill slowly. The fill continues until the STOP FILL sensor sends
the controller a signal that it is now in liquid. The controller will close the liquid
supply solenoid to stop the fill. As liquid evaporates, the display will indicate the
liquid is at a normal level as the cycle begins again.
Power
The control can be turned on and off by pressing the Power button followed by “42”,
as instructed on the display panel. The two-step shutdown is a precaution against
accidental shutdown. Shutdown can also be password protected to prevent users
from turning the system on and off under the security section of this manual.
Main Display Screen
The main display screen consists of 4 lines of information.
Line 1: Displays the current status of the control. It indicates if all systems are normal
or if any errors have been detected. Error messages disappear when the
error is corrected.
Line 2: Displays the level sensing in the control. If the 7-thermistor or 8-thermistor
assembly is being used, the control will indicate actual liquid level in the
freezer. If a 4-thermistor assembly is being used, the control will indicate
LOW if the liquid level is below Start Fill sensor #2, NORMAL if the liquid
level is between sensor #2 and sensor #3, and HIGH if the liquid level is
above Stop Fill sensor #3. In addition, LOW LEVEL ALARM is indicated when
the liquid level is below sensor #1 and HIGH LEVEL ALARM is indicated
when liquid level is above sensor #4.
12
KRYOS
CONTROLLER OPERATION
This section of the operating manual is for Taylor-Wharton approved equipment that
uses the KRYOS controller.
Introduction
The KRYOS temperature and LN
2
level controller is designed for easy operation
and uninterrupted, reliable service. This controller will maintain the selected
liquid level range of LN
2
in your refrigerator as well as provide audible and
visual alarms for any alarm conditions that may occur. An Alarm is any condition
outside the activated preset limits on the control, such as an open sensor circuit or
temperature alarm. “System Events” are lid openings and closings, solenoid valve
openings and closing, and operation of the controller’s relay for remote alarm
indication. System Events, Alarms and Temperature “Data” can be downloaded.
The KRYOS controller should require no additional attention to maintain
liquid level if an adequate supply source of liquid nitrogen is maintained. If
your protocol calls for you to “top-off” the Cryostorage System at the end of
a workday or workweek, press the FILL button. The unit will fill to the upper
allowable liquid level and stop automatically. You may choose to manually stop
the fill by pressing the STOP button at anytime during the fill.
Normal Fill Cycle
When the refrigerator is filled and the controller is operating, the START FILL and
LOW ALARM sensors are immersed in liquid nitrogen. Their resistance values
are interpreted by the controller as “in liquid”. At the same time, the STOP FILL
and the HIGH ALARM sensors are above the liquid pool, informing the control
that these sensors are in vapor. As liquid nitrogen evaporates, the liquid level
in the refrigerator drops slowly until the START FILL sensor is above the liquid
and sends a different signal to the controller. After a delay sufficient to ensure
the signal, the controller interprets this condition as low liquid and opens the fill
solenoid, admitting more liquid nitrogen from the supply source.
The refrigerator will fill slowly. The fill continues until the STOP FILL sensor sends
the controller a signal that it is now in liquid. The controller will close the liquid
supply solenoid to stop the fill. As liquid evaporates, the display will indicate the
liquid is at a normal level as the cycle begins again.
Power
The control can be turned on and off by pressing the Power button followed by “42”,
as instructed on the display panel. The two-step shutdown is a precaution against
accidental shutdown. Shutdown can also be password protected to prevent users
from turning the system on and off under the security section of this manual.
Main Display Screen
The main display screen consists of 4 lines of information.
Line 1: Displays the current status of the control. It indicates if all systems are normal
or if any errors have been detected. Error messages disappear when the
error is corrected.
Line 2: Displays the level sensing in the control. If the 7-thermistor or 8-thermistor
assembly is being used, the control will indicate actual liquid level in the
freezer. If a 4-thermistor assembly is being used, the control will indicate
LOW if the liquid level is below Start Fill sensor #2, NORMAL if the liquid
level is between sensor #2 and sensor #3, and HIGH if the liquid level is
above Stop Fill sensor #3. In addition, LOW LEVEL ALARM is indicated when
the liquid level is below sensor #1 and HIGH LEVEL ALARM is indicated
when liquid level is above sensor #4.
12
KRYOS
CONTROLLER OPERATION
This section of the operating manual is for Taylor-Wharton approved equipment that
uses the KRYOS controller.
Introduction
The KRYOS temperature and LN
2
level controller is designed for easy operation
and uninterrupted, reliable service. This controller will maintain the selected
liquid level range of LN
2
in your refrigerator as well as provide audible and
visual alarms for any alarm conditions that may occur. An Alarm is any condition
outside the activated preset limits on the control, such as an open sensor circuit or
temperature alarm. “System Events” are lid openings and closings, solenoid valve
openings and closing, and operation of the controller’s relay for remote alarm
indication. System Events, Alarms and Temperature “Data” can be downloaded.
The KRYOS controller should require no additional attention to maintain
liquid level if an adequate supply source of liquid nitrogen is maintained. If
your protocol calls for you to “top-off” the Cryostorage System at the end of
a workday or workweek, press the FILL button. The unit will fill to the upper
allowable liquid level and stop automatically. You may choose to manually stop
the fill by pressing the STOP button at anytime during the fill.
Normal Fill Cycle
When the refrigerator is filled and the controller is operating, the START FILL and
LOW ALARM sensors are immersed in liquid nitrogen. Their resistance values
are interpreted by the controller as “in liquid”. At the same time, the STOP FILL
and the HIGH ALARM sensors are above the liquid pool, informing the control
that these sensors are in vapor. As liquid nitrogen evaporates, the liquid level
in the refrigerator drops slowly until the START FILL sensor is above the liquid
and sends a different signal to the controller. After a delay sufficient to ensure
the signal, the controller interprets this condition as low liquid and opens the fill
solenoid, admitting more liquid nitrogen from the supply source.
The refrigerator will fill slowly. The fill continues until the STOP FILL sensor sends
the controller a signal that it is now in liquid. The controller will close the liquid
supply solenoid to stop the fill. As liquid evaporates, the display will indicate the
liquid is at a normal level as the cycle begins again.
Power
The control can be turned on and off by pressing the Power button followed by “42”,
as instructed on the display panel. The two-step shutdown is a precaution against
accidental shutdown. Shutdown can also be password protected to prevent users
from turning the system on and off under the security section of this manual.
Main Display Screen
The main display screen consists of 4 lines of information.
Line 1: Displays the current status of the control. It indicates if all systems are normal
or if any errors have been detected. Error messages disappear when the
error is corrected.
Line 2: Displays the level sensing in the control. If the 7-thermistor or 8-thermistor
assembly is being used, the control will indicate actual liquid level in the
freezer. If a 4-thermistor assembly is being used, the control will indicate
LOW if the liquid level is below Start Fill sensor #2, NORMAL if the liquid
level is between sensor #2 and sensor #3, and HIGH if the liquid level is
above Stop Fill sensor #3. In addition, LOW LEVEL ALARM is indicated when
the liquid level is below sensor #1 and HIGH LEVEL ALARM is indicated
when liquid level is above sensor #4.