6-25
Sterilizer Operation Operator Manual 387366-389
Important: Before running a Leak Test Cycle, the chamber
temperature should be stabilized by running a Normal Cycle. A Leak
Test Cycle should be run on the sterilizer at least once each week.
It should be one of the first cycles run for the day, but not the first cycle.
In this cycle, the sterilizer automatically checks for vacuum leaks in
the piping and door seal. If the sterilizer fails the leak test, it must be
inspected by a service technician before using the sterilizer further.
The leak test can be used to confirm that the sterilizer piping is intact
after performing repairs.
NOTE: Before running a Leak Test, note the following:
1) Leak Tests are not substitutes for DART
1
and Bowie-Dick
tests.
2) The measured leak rate (mmHg/minute) is calculated by the
control over a timed 10 minute period and is included in the cycle
printout. A leak rate of 1 mmHg/minute or less is considered
acceptable.
Run a Leak Test Cycle by pressing LEAK TEST button from Cycles
Page 6 of 6 Screen (Screen 7). Cycle passes through following phases:
JACKET CHARGE PHASE: Jacket charge phase continues until
jacket temperature is greater than 132.0°C (270.0°F).
ACTIVATE SEAL PHASE: Door gasket seals with steam until door
seal switch is closed. An additional 20 seconds elapses, after seal
switch is closed, before phase is complete.
PURGE PHASE: Steam enters chamber from jacket to control
pressure at 6 psig. Fast exhaust and water ejector is on to aid in
removing air from chamber.
PULSE EXHAUST PHASE: Chamber exhausts to 4.0 psig (0.28 bar).
Waste temperature is controlled to maintain approximately 60°C
(140°F). Jacket temperature is controlled to maintain approximately
133.5°C (273.0°F) in jacket.
PULSE EVACUATE PHASE: Chamber evacuates to PULSE VACUUM
setpoint (default 10.0 inHg (-0.34 bar). Waste temperature is controlled
to maintain approximately 60°C (140°F). Jacket temperature is
controlled to maintain approximately 133.5°C (273.0°F) in jacket.
1
In this context and elsewhere, where implied
(such as on screen buttons), DART is an
acronym for Daily Air Removal Test. However,
note that the term is registered as a testing
apparatus, i.e., Dart
®
Testing Apparatus to
Determine the Effectiveness of Removing Air
from a Chamber.
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