Emerson Rosemount 3051S Series Reference Manual page 114

Rosemount 3051S Series
Figure 7-8. Statistical Process
Monitoring main screen
7-10
The SPM Status screen shows overview information for the diagnostic.
The process for operation of the SPM diagnostic is:
• Configure the diagnostic using Baseline Configuration and Detection
Configuration screens.
• Turn on the diagnostic from the SPM Status screen.
The configuration process starts with Baseline Configuration, Figure 7-9 on
page 7-11. The configurable fields are:
SPM Variable:
This is the statistical variable to be used for SPM diagnostic detection.
Stdev & Mean (default)
Standard deviation and mean of the process are calculated. Users can set
independent sensitivity thresholds for both statistical variables.
Coefficient of Variation (CV)
CV is calculated from the ratio of standard deviation to mean and is better
suited for DP flow applications where the mean pressure is likely to
change due to changing process operation. CV puts standard deviation in
context of the mean and is represented as a % value.
Reference Manual
00809-0100-4801, Rev FA
October 2010