ASP STERRAD 100, Service Manual

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Injection Stage
Duration Parameter Limit
6 Minutes Pressure 300 mTorr min. at 10 sec Injection
system interrupted P60 =
pressure at 60 sec (2 * P60 - P56 -
P64 60 MVP aborts)
6 Torr min. at end
12 Torr max. throughout period
Temperature 60° C Alarm
40 - 50° C Control
When the chamber pressure has been reduced to 300 mTorr, a
premeasured amount of concentrated H2O2 is injected from the cassette
into the vaporizer cap and vaporized. If the pressure in the chamber does
not rise above 6 Torr within 6 minutes, the cycle is canceled and the
message “Low Pressure In Injection” is printed. If the pressure in the
process chamber has risen to between 6 and 12 Torr at the end of the 6
minute injection stage, the diffusion phase begins.
Diffusion Stage
Duration Parameter Limit
42 Minutes Pressure 6 Torr min.
14 Torr max.
As the vaporized H2O2 diffuses over the surfaces of the objects to be
sterilized, the chamber pressure normally rises between 6 to 14 Torr. If
the chamber pressure rises higher than 14 Torr during this phase, too
much air may have leaked into the process chamber and the cycle is
canceled with the message “Over Pressure In Diffusion.” If the chamber
pressure drops below 6 Torr, some absorptive material may be in the
load and the cycle is canceled with the message “Low Pressure in
Diffusion.”
Theory of Operation-Overview System Operation
ASP Service Guide rev. D STERRAD® 100 Sterilizer 2-7