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OWNER’S MANUAL
The ventilation sensor monitors the vacuum between the cabinet ventilation pump and
the interior of the cabinet. The pressure within the cabinet relative to the room is
negative (vacuum) which ensures the sterilizing gas which has diffused through the
walls of the sterilization liner bag is retained within the cabinet.
Before the ventilation pump is turned on at the beginning of the cycle, the controller
tests to make sure the ventilation sensor is reading zero vacuum. It then turns on the
ventilation pump and checks to see if there is adequate vacuum. If the vacuum is less
than 0.25 inches of water vacuum, the VENT PUMP FAILURE message will be dis-
played.
During the entire sterilization and ventilation cycle, the amount of vacuum created by
the ventilation pump is also continuously monitored while the vent pump is running.
If a VENT PUMP FAILURE message is displayed, the audible alarm may be silenced
by pressing the EXIT button.
As an automated safety precaution, if the cabinet ventilation pump fails at any time
during the 12 (or 24) hour sterilization cycle, the purge pump will automatically start
and run continuously for the remainder of the sterilization and ventilation cycle. The
sterilization liner bag will be vacuumed down until the check valves in the purge tube
open at 3.0” (7.6 cm) of water vacuum. At this point the check valves will open and
the cabinet will then be vented through the sterilization liner bag for the remainder of
the cycle.
6.13 Purge Pump Alarm: Similarly, the purge pump sensor monitors the vacuum within
the tubing that connects the purge pump to the sterilization liner bag. Before the purge
pump is turned on at the beginning of the cycle, the controller tests to make sure the
purge sensor is reading zero vacuum. The purge pump is then turned on and the sterili-
zation liner bag is vacuumed down. The controller checks to make sure the vacuum is
greater than 5.00 inches of water vacuum. Otherwise, the controller will display a
PURGE PUMP FAILURE message.
During the 2 hour ventilating bag cycle at the end of the 12 (or 24) hour sterilizing cy-
cle, the amount of vacuum created by the purge pump is also continuously monitored
while it is running. If the vacuum created by the purge pump is inadequate for 20 con-
secutive seconds, a PURGE PUMP FAILURE message is displayed.
If the purge pump fails during the 2 hour ventilation cycle, the controller will
automatically add 24 hours to the cycle time to allow the remaining Ethylene Oxide
contained within the sterilization liner bag to diffuse through the walls of the steriliza-
tion liner bag as opposed to being flushed with fresh air for 2 hours, as would occur
during normal operation.
© Andersen Products Ltd