Taylor-Wharton KRYOS Controller - Manual (Page 34)

32
KRYOS
Indicates Low LN
2
Supply
When the START FILL thermistor is uncovered, the controller calls for the fill solenoid
valve to open. If the STOP FILL thermistor is not covered with LN
2
in the pre-
determined amount of time, the controller is programmed to interpret this as a LN
2
supply shortage.
1. Check contents gauge and pressure gauge of supply cylinder. Both liquid
contents and pressure (15 to 22 psi) are required to complete a fill.
2. Confirm that no other transfer hose or apparatus is attached to the supply
cylinder. Either could compromise adequate tank pressure required to complete
a fill in 30 minutes.
t Check the distance that the LN
2
must travel to reach the freezer. Observe
the time it takes for Liquid LN
2
to reach the Freezer through the usual piping
conditions (Pipe-Temperature at start fill). Liquid should be entering the
chamber within 4 minutes under normal (usual) line temperature conditions.
t Distances over 6 feet (1.83 m) without a gas by-pass are discouraged due to
excessive boil off. Un-insulated fill line for the last 4 feet are encouraged to
drive down vapor temperatures in the freezing chamber during each fill.
t A “Keep-Cold” or a “Keep-Full” device are almost always needed on an LN
2
pipeline, whether the pipe is Vacuum Jacketed or Foam Insulated.
3. Confirm that the solenoid valve is open when a fill is called for.
t If no flow is detected, the solenoid valve is not getting the signal to open, or
it is opening and there is a blockage in the line. Check the connections on
the leads near the solenoid itself, as well as the connector at the controller.
t Confirm that the wires have not been pinched, creating a short circuit.
4. If a longer fill time is desired, change the setting by selecting: MENU, SYSTEM
ALARMS, LN
2
SUPPLY ALARM.
Indicates Open Sensor
1. Normally, this message is associated with a loose plug or connector. Check the
connection at the foot of the controller labeled SENSORS.
2. If the problem persists, the sensor assembly may need to be replaced. To
determine this select: MENU, LEVEL SENSING, TEST LEVEL SENSORS. An “L”,
“G”, or “O” (open) will indicate individual thermistor status.
3. Thermocouple is not repairable. Replace from stock.
Temperature Reading 10 to 20 Degrees Warm
t Prepare an ice water slurry with crushed ice and tap water. Dip or pour LN
2
into a styrofoam cup to prepare an LN
2
bath. Calibrate the controller. Select
MENU, TEMPERATURE, CALIBRATE TEMPERATURE. Follow the on-screen
instructions. Hold the thermocouple in each bath until the control completes its
self-calibration.
t Make sure the thermocouple is clean and dry before and after each bath.
t Reposition the thermocouple at the elevation the customer wants to monitor or
control.
32
KRYOS
Indicates Low LN
2
Supply
When the START FILL thermistor is uncovered, the controller calls for the fill solenoid
valve to open. If the STOP FILL thermistor is not covered with LN
2
in the pre-
determined amount of time, the controller is programmed to interpret this as a LN
2
supply shortage.
1. Check contents gauge and pressure gauge of supply cylinder. Both liquid
contents and pressure (15 to 22 psi) are required to complete a fill.
2. Confirm that no other transfer hose or apparatus is attached to the supply
cylinder. Either could compromise adequate tank pressure required to complete
a fill in 30 minutes.
t Check the distance that the LN
2
must travel to reach the freezer. Observe
the time it takes for Liquid LN
2
to reach the Freezer through the usual piping
conditions (Pipe-Temperature at start fill). Liquid should be entering the
chamber within 4 minutes under normal (usual) line temperature conditions.
t Distances over 6 feet (1.83 m) without a gas by-pass are discouraged due to
excessive boil off. Un-insulated fill line for the last 4 feet are encouraged to
drive down vapor temperatures in the freezing chamber during each fill.
t A “Keep-Cold” or a “Keep-Full” device are almost always needed on an LN
2
pipeline, whether the pipe is Vacuum Jacketed or Foam Insulated.
3. Confirm that the solenoid valve is open when a fill is called for.
t If no flow is detected, the solenoid valve is not getting the signal to open, or
it is opening and there is a blockage in the line. Check the connections on
the leads near the solenoid itself, as well as the connector at the controller.
t Confirm that the wires have not been pinched, creating a short circuit.
4. If a longer fill time is desired, change the setting by selecting: MENU, SYSTEM
ALARMS, LN
2
SUPPLY ALARM.
Indicates Open Sensor
1. Normally, this message is associated with a loose plug or connector. Check the
connection at the foot of the controller labeled SENSORS.
2. If the problem persists, the sensor assembly may need to be replaced. To
determine this select: MENU, LEVEL SENSING, TEST LEVEL SENSORS. An “L”,
“G”, or “O” (open) will indicate individual thermistor status.
3. Thermocouple is not repairable. Replace from stock.
Temperature Reading 10 to 20 Degrees Warm
t Prepare an ice water slurry with crushed ice and tap water. Dip or pour LN
2
into a styrofoam cup to prepare an LN
2
bath. Calibrate the controller. Select
MENU, TEMPERATURE, CALIBRATE TEMPERATURE. Follow the on-screen
instructions. Hold the thermocouple in each bath until the control completes its
self-calibration.
t Make sure the thermocouple is clean and dry before and after each bath.
t Reposition the thermocouple at the elevation the customer wants to monitor or
control.
32
KRYOS
Indicates Low LN
2
Supply
When the START FILL thermistor is uncovered, the controller calls for the fill solenoid
valve to open. If the STOP FILL thermistor is not covered with LN
2
in the pre-
determined amount of time, the controller is programmed to interpret this as a LN
2
supply shortage.
1. Check contents gauge and pressure gauge of supply cylinder. Both liquid
contents and pressure (15 to 22 psi) are required to complete a fill.
2. Confirm that no other transfer hose or apparatus is attached to the supply
cylinder. Either could compromise adequate tank pressure required to complete
a fill in 30 minutes.
t Check the distance that the LN
2
must travel to reach the freezer. Observe
the time it takes for Liquid LN
2
to reach the Freezer through the usual piping
conditions (Pipe-Temperature at start fill). Liquid should be entering the
chamber within 4 minutes under normal (usual) line temperature conditions.
t Distances over 6 feet (1.83 m) without a gas by-pass are discouraged due to
excessive boil off. Un-insulated fill line for the last 4 feet are encouraged to
drive down vapor temperatures in the freezing chamber during each fill.
t A “Keep-Cold” or a “Keep-Full” device are almost always needed on an LN
2
pipeline, whether the pipe is Vacuum Jacketed or Foam Insulated.
3. Confirm that the solenoid valve is open when a fill is called for.
t If no flow is detected, the solenoid valve is not getting the signal to open, or
it is opening and there is a blockage in the line. Check the connections on
the leads near the solenoid itself, as well as the connector at the controller.
t Confirm that the wires have not been pinched, creating a short circuit.
4. If a longer fill time is desired, change the setting by selecting: MENU, SYSTEM
ALARMS, LN
2
SUPPLY ALARM.
Indicates Open Sensor
1. Normally, this message is associated with a loose plug or connector. Check the
connection at the foot of the controller labeled SENSORS.
2. If the problem persists, the sensor assembly may need to be replaced. To
determine this select: MENU, LEVEL SENSING, TEST LEVEL SENSORS. An “L”,
“G”, or “O” (open) will indicate individual thermistor status.
3. Thermocouple is not repairable. Replace from stock.
Temperature Reading 10 to 20 Degrees Warm
t Prepare an ice water slurry with crushed ice and tap water. Dip or pour LN
2
into a styrofoam cup to prepare an LN
2
bath. Calibrate the controller. Select
MENU, TEMPERATURE, CALIBRATE TEMPERATURE. Follow the on-screen
instructions. Hold the thermocouple in each bath until the control completes its
self-calibration.
t Make sure the thermocouple is clean and dry before and after each bath.
t Reposition the thermocouple at the elevation the customer wants to monitor or
control.