Taylor-Wharton KRYOS Controller - Manual (Page 17)

15
KRYOS
Help Screens
The Help button provides help to the user at any point in the menu system. The help
message is displayed and the user is then prompted to press a button to return to
the menu system.
Temperature Thermocouple Select
The chamber temperature is monitored with 1 or 2 Type T thermocouples. The
thermocouple is placed in the chamber to monitor temperature level at the top of
the inventory system. Factory installation includes one thermocouple inside of the
LABS thermocouple tube or inside the K-Series sensor tube at an elevation to match
the height of standard racks. A second Type T thermocouple may be added to
monitor another location inside the chamber. Both thermocouples can be activated/
deactivated through the menu system (
MENU, 1, 1).
Calibrate Temperature
KRYOS provides easy calibration of the thermocouples. To calibrate, the user should
enter the menu system (
MENU, 1, 2). Remove thermocouple T1 from the board
and insert a spare Thermocouple into port T1. Tip Thermocouple #1 into and ice
water bath. The fourth line of the control display will indicate “Wait” and will give a
reading on the proximity of the temperature to 0ºC. When the temperature reaches
equilibrium the control will indicate “OK” and the user can press the left soft-key
button. Dry the thermocouple thoroughly. Next, the control will prompt you to dip
thermocouple #1 into LN
2
. Wait while the control reaches equilibrium at -196ºC
(-320ºF). When it does, the control will again indicate “OK” and the user can
again press the left soft-key button. The control is now calibrated. Replace system
Thermocouple back into port T1. Please note that the board temperature calibration
is done through Thermocouple port T1.
Test Temperature System
The temperature circuitry can be checked at any time through the menu system
(
MENU, 1, 3). This check will tell if the thermocouples are working or if they are
“open” (broken or unplugged). If a thermocouple is not connected to the control it
will check as “open.” If a thermocouple is “Disabled” through the menu system, it
will not show up on the check.
Level Sensing
The level sensing in the system is determined through the use of thermistor-based
sensor assemblies. Thermistors are thermal resistors whose resistances change
as temperature changes. Their use in liquid level control is a time-tested method
to provide accurate results. The KRYOS uses a 7-, 8- or a 4-thermistor assembly
to measure liquid level in the freezer. The 4-sensor assembly provides general
information about liquid level (High Alarm, Normal, and Low Alarm) while the 7-
and 8-thermistor assemblies provide liquid level readings accurate to within one
inch. When the LN
2
level drops below the START FILL sensor, the control opens the
solenoid valve to commence the fill process. This process continues until the LN
2
level reaches the STOP FILL sensor. When the control “senses” that the LN
2
has
reached the upper level, it flashes “Check” on the display while the KRYOS insures
that it has not received false signals and then allows the fill to stop. The fill process
can be halted at any time before it reaches the STOP FILL sensor by manually
pressing the STOP FILLING button.
15
KRYOS
Help Screens
The Help button provides help to the user at any point in the menu system. The help
message is displayed and the user is then prompted to press a button to return to
the menu system.
Temperature Thermocouple Select
The chamber temperature is monitored with 1 or 2 Type T thermocouples. The
thermocouple is placed in the chamber to monitor temperature level at the top of
the inventory system. Factory installation includes one thermocouple inside of the
LABS thermocouple tube or inside the K-Series sensor tube at an elevation to match
the height of standard racks. A second Type T thermocouple may be added to
monitor another location inside the chamber. Both thermocouples can be activated/
deactivated through the menu system (
MENU, 1, 1).
Calibrate Temperature
KRYOS provides easy calibration of the thermocouples. To calibrate, the user should
enter the menu system (
MENU, 1, 2). Remove thermocouple T1 from the board
and insert a spare Thermocouple into port T1. Tip Thermocouple #1 into and ice
water bath. The fourth line of the control display will indicate “Wait” and will give a
reading on the proximity of the temperature to 0ºC. When the temperature reaches
equilibrium the control will indicate “OK” and the user can press the left soft-key
button. Dry the thermocouple thoroughly. Next, the control will prompt you to dip
thermocouple #1 into LN
2
. Wait while the control reaches equilibrium at -196ºC
(-320ºF). When it does, the control will again indicate “OK” and the user can
again press the left soft-key button. The control is now calibrated. Replace system
Thermocouple back into port T1. Please note that the board temperature calibration
is done through Thermocouple port T1.
Test Temperature System
The temperature circuitry can be checked at any time through the menu system
(
MENU, 1, 3). This check will tell if the thermocouples are working or if they are
“open” (broken or unplugged). If a thermocouple is not connected to the control it
will check as “open.” If a thermocouple is “Disabled” through the menu system, it
will not show up on the check.
Level Sensing
The level sensing in the system is determined through the use of thermistor-based
sensor assemblies. Thermistors are thermal resistors whose resistances change
as temperature changes. Their use in liquid level control is a time-tested method
to provide accurate results. The KRYOS uses a 7-, 8- or a 4-thermistor assembly
to measure liquid level in the freezer. The 4-sensor assembly provides general
information about liquid level (High Alarm, Normal, and Low Alarm) while the 7-
and 8-thermistor assemblies provide liquid level readings accurate to within one
inch. When the LN
2
level drops below the START FILL sensor, the control opens the
solenoid valve to commence the fill process. This process continues until the LN
2
level reaches the STOP FILL sensor. When the control “senses” that the LN
2
has
reached the upper level, it flashes “Check” on the display while the KRYOS insures
that it has not received false signals and then allows the fill to stop. The fill process
can be halted at any time before it reaches the STOP FILL sensor by manually
pressing the STOP FILLING button.
15
KRYOS
Help Screens
The Help button provides help to the user at any point in the menu system. The help
message is displayed and the user is then prompted to press a button to return to
the menu system.
Temperature Thermocouple Select
The chamber temperature is monitored with 1 or 2 Type T thermocouples. The
thermocouple is placed in the chamber to monitor temperature level at the top of
the inventory system. Factory installation includes one thermocouple inside of the
LABS thermocouple tube or inside the K-Series sensor tube at an elevation to match
the height of standard racks. A second Type T thermocouple may be added to
monitor another location inside the chamber. Both thermocouples can be activated/
deactivated through the menu system (
MENU, 1, 1).
Calibrate Temperature
KRYOS provides easy calibration of the thermocouples. To calibrate, the user should
enter the menu system (
MENU, 1, 2). Remove thermocouple T1 from the board
and insert a spare Thermocouple into port T1. Tip Thermocouple #1 into and ice
water bath. The fourth line of the control display will indicate “Wait” and will give a
reading on the proximity of the temperature to 0ºC. When the temperature reaches
equilibrium the control will indicate “OK” and the user can press the left soft-key
button. Dry the thermocouple thoroughly. Next, the control will prompt you to dip
thermocouple #1 into LN
2
. Wait while the control reaches equilibrium at -196ºC
(-320ºF). When it does, the control will again indicate “OK” and the user can
again press the left soft-key button. The control is now calibrated. Replace system
Thermocouple back into port T1. Please note that the board temperature calibration
is done through Thermocouple port T1.
Test Temperature System
The temperature circuitry can be checked at any time through the menu system
(
MENU, 1, 3). This check will tell if the thermocouples are working or if they are
“open” (broken or unplugged). If a thermocouple is not connected to the control it
will check as “open.” If a thermocouple is “Disabled” through the menu system, it
will not show up on the check.
Level Sensing
The level sensing in the system is determined through the use of thermistor-based
sensor assemblies. Thermistors are thermal resistors whose resistances change
as temperature changes. Their use in liquid level control is a time-tested method
to provide accurate results. The KRYOS uses a 7-, 8- or a 4-thermistor assembly
to measure liquid level in the freezer. The 4-sensor assembly provides general
information about liquid level (High Alarm, Normal, and Low Alarm) while the 7-
and 8-thermistor assemblies provide liquid level readings accurate to within one
inch. When the LN
2
level drops below the START FILL sensor, the control opens the
solenoid valve to commence the fill process. This process continues until the LN
2
level reaches the STOP FILL sensor. When the control “senses” that the LN
2
has
reached the upper level, it flashes “Check” on the display while the KRYOS insures
that it has not received false signals and then allows the fill to stop. The fill process
can be halted at any time before it reaches the STOP FILL sensor by manually
pressing the STOP FILLING button.