Reference Manual
00809-0100-4801, Rev FA
October 2010
Rosemount 3051S Series
7-12
Power Interruption Action
This is used to direct what the diagnostic should do in the case of a power
interruption or if the diagnostic is manually disabled and then enabled. The
options are:
Monitor (default)
When SPM restarts, the diagnostic returns to the Monitoring mode
immediately and uses the baseline values computed before the
interruption.
Relearn
When SPM restarts, the diagnostic enters the Learning mode and will
recalculate new baseline values.
Low Pressure Cut-off
This is the minimum pressure required to operate the diagnostic with
Coefficient of Variation selected as the statistical variable. The coefficient of
variation is a ratio of standard deviation to mean and is defined for non-zero
mean values. When the mean value is near zero, the coefficient of variation is
sensitive to small changes in the mean, limiting its usefulness. Default value
is 1% of upper sensor limit.
Insufficient Variability
The SPM diagnostic uses process noise to baseline the process and detect
abnormal situations. Typically the Insufficient Variability check is on to ensure
there is sufficient noise for proper operation. In a quiet application with very
minimal process noise, this setting can be turned off. The default setting is
ON.
Standard Deviation Difference, Mean Difference
If these difference values are exceeded during the Verification mode, SPM
diagnostic will not start Monitoring mode and will continue verifying the
baseline. If SPM diagnostic will not leave the Verification mode, these values
should be increased. If the diagnostic still remains in the Verification mode
with the highest level, the Learning/Monitoring period should be increased.
Parameter Definition
On (default) Perform insufficient variation check
Off Do not perform insufficient variation check
Table 7-1. Standard Deviation Verification Criteria
Parameter Definition
None Do not perform any verification checks for standard deviation.
10% If the difference between baseline standard deviation value and the
verification value exceeds 10%, diagnostic will stay in Verification
mode.
20% (default) If the difference between baseline standard deviation value and the
verification value exceeds 20%, diagnostic will stay in Verification
mode.
30% If the difference between baseline standard deviation value and the
verification value exceeds 30%, diagnostic will stay in Verification
mode.
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