6-44
387366-389 Operator Manual Sterilizer Operation
6.17.1 Drain Mode DRAIN or standard time at temperature mode selection allows
exposure time to be started from temperature probe (RTD) located in
chamber drain line. Exposure time starts when drain line temperature
is equal to or greater than chamber temperature setpoint, regardless
of load temperature.
6.17.2 Load/Drain Mode
LOAD/DRAIN or
equivalent time at sterilization temperature
mode
selection allows exposure time to start when load (located in product)
and chamber drain line probes reach a preset sterilize temperature. F
o
value is calculated from load probe located in product load. Charge or
exposure phase terminates if calculated F
o
value is equal to preselected
value, or if sterilize time counts down to 0 (whichever occurs first).
The F
o
value and load temperature are printed along with standard
status prints.
6.17.3 F
o
Sterilization The F
o
is the measure of equivalent time at which a specific load would
have been exposed at the base sterilization temperature of 121.0°C
(250.0° F). Units of F
o
are minutes. The sterilizer control is programmed
to calculate F
o
once all load probes have reached 110.0°C (230.0°F),
although significant F
o
accumulation does not occur until all load
probes are above 121.0°C (250.0°F), F
o
accumulates faster than real
(clock) minutes.
The formula for F
o
is F
o
= (10
[(t1-t2)/Z]
) * t
Where: t1 = Load temperature
t2 = 121.0°C (250.0°F)
Z = 10.0°C (18.0°F)
t = 1/60 minute (the time duration between F
o
accumulations per
1 minute).
6.18 Separate
Steam Feed Option
The separate steam feed option directs steam to jacket, while
directing steam to chamber separately. The default method is to
allow chamber steam to be fed from the jacket.
The separate steam feed option allows jacket temperature to be
controlled independently from chamber temperature. Jacket
temperature can be set for each individual cycle; see S
ECTION
6.20.1, Cycle Values.
6.19 Options
Screen
The Options screen provides a way to:
• Duplicate Print • Access Supervisor Mode
• Print Values • Access Service Mode
• Obtain Ethernet IP Address
Use Options Menu button on upper right corner of a Cycles screen to
access Options screen.
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