Alarm Conditions
There are five possible alarm conditions that the CryoWiz™ can display and relay to a remote alarm:
1. O
2
: This alarm, indicates that an oxygen deficiency monitor has relayed an alarm
condition to the system, and that the CryoWiz™ has shut off all valves. A red
light in the ALERTS section of the front graphic illuminates for this condition.
2. DRY N
2
: This alarm indicates that the pneumatic dry nitrogen inlet pressure has
dropped below the pressure required to operate the system (90 psig).
A red light in the ALERTS section of the front graphic illuminates for this
condition.
3. FREEZE: This alarm indicates that the system has sensed that a valve may be in a frozen
condition. A red light in the ALERTS section of the front graphic illuminates for this
condition.
4. REPLACE (left): This alarm indicates that the left bank has been depleted. A red light in the
LEFT section of the front graphic illuminates for this condition.
5. REPLACE (right): This alarm indicates that the right bank has been depleted. A red light in the
RIGHT section of the front graphic illuminates for this condition.
Oxygen Deficiency Alarm Condition
Due to the possibility of an oxygen deficient atmosphere when dealing with LN2, the CryoWiz™ has been
designed to integrate with oxygen deficiency monitors (see section “Connecting and Oxygen Deficiency Monitor”).
If an oxygen deficiency monitor has an alarm condition and a compatible output, the alarm can be relayed to the
CryoWiz™. The CryoWiz™ will immediately close all valves, illuminate the red O
2
alarm light, and sound the
audible alarm if it is enabled. The unit will go back to normal operation only when the source of the alarm has
been cleared.
If an oxygen deficiency monitor is alarming, do not enter the space where oxygen deficiency has been detected.
If the LN2 cylinders are located outside the oxygen-deficient space, close the cylinder valves, and notify
appropriate safety personnel. The oxygen deficient area must be appropriately ventilated until the source of the
oxygen deficiency has been determined and corrected.
Turn the LN2 cylinder valves back on only after the alarm condition has been corrected.
Freeze Alarm Condition
This alarm indicates that one of the valves on the CryoWiz™ has frozen shut. This is an extremely rare event. No
occurrence has ever been recorded. If the system detects that a valve has frozen shut, turn off the LN2 supply,
and allow sufficient time for the unit to defrost and warm up. This may take several hours. During this time,
ensure that all critical samples and equipment are adequately filled or supplied. Once the system has defrosted,
turn the CryoWiz™ and its LN2 supply back on, and verify that the freeze alarm has cleared. If not, contact
CONCOA or your local CONCOA service center.
Dry Nitrogen Alarm Condition
The DRY N2 alarm indicates that the pneumatic dry nitrogen gas supply has dropped below the alarm set point
and may not be able to keep the system running properly. Check to make sure that the pneumatic dry nitrogen
supply is between 95 and 110 psig.
Replace Alarm Condition
The system has determined that a bank is now empty. The corresponding bank REPLACE light will illuminate
red, and the audible alarm will sound. Once the empty side is replenished with cylinders supplying the
CryoWiz™ with sufficient LN2 pressure, press the RESET button to extinguish the alarm.
Alarm Silence
The alarm silence button will silence the local audible alarm. The alarm indicator light will remain illuminated
until the alarm condition has been cleared.
To Next Page
Loading...
Need help?
General
