15
Manual Supplement
00809-0200-4853, Rev AB
Rosemount 3051S Series Pressure Transmitter
November 2017
Rosemount 3051S Series Pressure Transmitter
Figure 6. SPM Monitoring Cycle Effect on Statistical Values
SPM_USER_COMMAND
Select Learn after all parameters have been configured to begin the Learning Phase. The monitoring
phase will start automatically after the learning process is complete. Select Quit to stop the SPM.
“Detect” may be selected to return to the monitoring phase.
SPM_ACTIVE
The SPM_ACTIVE parameter starts the Statistical Process Monitoring when “Enabled”. “Disabled”
(default) turns the diagnostic monitoring off. Must be set to “Disabled” for configuration. Only set to
“Enabled” after fully configuring the SPM.
Enabling SPM applies a high-pass filter to the pressure measurement prior to calculating standard
deviation. This removes the effect of slow or gradual process changes from the standard deviation
calculation while preserving the higher-frequency process fluctuations. Using the high-pass filter
reduces the likelihood of generating a false detection if there is a normal process or setpoint change.
6.8 Alert configuration
To have SPM generate a Plantweb alert, the alert limits must be configured on the mean and/or standard
deviation. The three alert limits available are:
SPM_MEAN_LIM
Upper and lower limits for detecting a Mean Change
SPM_HIGH_VARIATION_LIM
Upper limit on standard deviation for detecting a High Variation condition
SPM_LOW_DYNAMICS_LIM
Lower limit on standard deviation for detecting a Low Dynamics condition (must be specified as a
negative number)
All limits are specified as a percent change in the statistical value from its baseline. If a limit is set to 0 (the
default setting) then the corresponding diagnostic is disabled. For example, if SPM_HIGH_VARIA-
TION_LIMIT is 0, then SPM does not detect an increase in standard deviation.
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