20
Manual Supplement
00809-0200-4853, Rev AB
Rosemount 3051S Series Pressure Transmitter
November 2017
Rosemount 3051S Series Pressure Transmitter
When adding a standard deviation for history collection in DeltaV, it is recommended that you not use
the default data compression settings. By default, the DeltaV Historian will log a new data point only
when the process value deviates by 0.01 or more. There are many diagnostics applications where it is
useful to look at changes in the standard deviation that are smaller than this. Therefore, it is
recommended that when logging the standard deviation, either the Data Compression should be
disabled (by unchecking the appropriate box) or the Deviation (EU) should be set to a much lower value,
for example, 0.001 or 0.0001.
Figure 11. DeltaV Add History Collection
Refer to the DeltaV books online for more details on the DeltaV Continuous Historian.
After the SPM value has been saved to the historian, when the DeltaV Process History View is opened for
the selected parameter, the graph will be populated with the historical data currently in the database
(Figure 12).
Figure 12. Trend of Standard Deviation in DeltaV Process History View
Finally, when the SPM data is trended in DeltaV, it is possible to configure HI and/or LO alarms on the
mean or standard deviation via the AI Block. This can be done by right clicking on the AI Function Block in
Control Studio, and selecting Assign Alarm. The Block Alarm configuration window will let you set up
desired alarm limits. Refer to the DeltaV books online for detailed information on configuring alarms.
General configuration Advanced configuration
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