Table 4-40 F Sterilization Prompts - Honeywell VPR100 User Manual

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
exceeds F , the function activates its discrete output CVn OS; this output remains ON (1) until the F
d
calculation is reset via the Reset Input.
The output CVn A2 is the Time Remaining (Tr) at the current temperature to achieve F
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
12/00
, which quantifies the destruction of microorganisms during a
0
represents the number of minutes after which the microorganism population is
0
0
(T-T ref )/Z
)]
measurements, in minutes. Dt is equal to the scan cycle of the instrument in
0
)
0
value will remain at zero while the Reset Input is ON (1). The
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
VPR & VRX – User Manual
Programming Function Blocks and Features
formula is:
value to the desired F value, F
0 0
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 0 (F d )
(Preset). When F equals or
d 0
0
and is calculated as
d
Definition
133