Emerson Rosemount 3051CF Series Reference Manual page 122

Advanced pressure diagnostics
July 2020
to determine if changes in the values foreshadowed or indicated the process upset. The
device can then make the statistical values available to the operator directly or to alarm or
alert software.
Second, the device has internal software that can be used to baseline the process noise or
signature via a learning process. Once the learning process is completed, the device itself
can detect significant changes in the noise or variation and communicate an alarm via
Plantweb
composition or equipment related problems.
7.4.1 SPM functionality
A block diagram of the SPM diagnostic is shown in
measured pressure) is input to a statistical calculations module where basic high pass
filtering is performed on the pressure signal. The mean (or average) is calculated on the
unfiltered pressure signal, and the standard deviation is calculated from the filtered
pressure signal. These statistical values are available via handheld communication devices
like the Handheld Communicator, asset management software, or distributed control
systems with F
Figure 7-3: Rosemount 3051 FF Statistical Process Monitoring
A. Process variable
B. SPM #
C. Statistical calculations module
D. Learning module
E. Baseline values
F. Decision module
G. Standard FF output
H. User configuration
I. SPM alert
J. Statistical parameters
122
®
alert or NE107 status signal. Typical applications are change in fluid
™
Fieldbus.
OUNDATION
Reference Manual
00809-0100-4774
Figure 7-4. The process variable (the
Rosemount 3051