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Programming Function Blocks and Features
Sterilization
The output CVn OV is a "kill time", F
sterilization process. F
decreased by one decimal or log unit. The F
= ∑ [dt x (10
F
0
where:
dt = time between F
minutes.
T = measured temperature input, in °C
T
= reference temperature (121°C typical)
ref
Z = product-dependent temperature constant
This function also compares the calculated F
equals or exceeds F
the F
calculation is reset via the Reset Input.
0
The output CVn A2 is the Time Remaining (Tr) at the current temperature to achieve F
calculated as follows:
(F
– F
d
_________
Tr =
(T-Tref)/Z
10
The F
calculation will be reset and the F
0
calculation will resume when the Reset Input goes OFF(0) again.
Table 4-40 describes the Sterilization prompts. See Table 4-2 for additional prompts.
Prompt
OUT LOW LIMIT
OUT HIGH LIMIT
RESET
TEMP INPUT
REFERENCE TEMP
TEMP CONSTANT
DESIRED F0
132
, which quantifies the destruction of microorganisms during a
0
represents the number of minutes after which the microorganism population is
0
(T-T ref )/Z
)]
measurements, in minutes. Dt is equal to the scan cycle of the instrument in
0
, the function activates its discrete output CVn OS; this output remains ON(1) until
d
)
0
0
Table 4-40 F
Sterilization Prompts
0
Range/Selections
OFF or number
OFF, discrete parameter, 0,
1
OFF, analog parameter,
number
OFF, analog parameter,
number
OFF, analog parameter,
number
OFF, analog parameter,
number
Video Recorder – User Manual
formula is:
0
value to the desired F
0
value will remain at zero while the Reset Input is ON(1). The
Displayed output value will be clamped and will flash
when these limits are exceeded.
Reset input
Measured temperature in degrees C
Reference temperature
Temperature constant Z
Desired F
(F
)
0
d
value, F
(Preset). When F
0
d
and is
d
Definition
0
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