Emerson Rosemount 3051S Series - Page 31

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Manual Supplement
00809-0200-4853, Rev AB
Rosemount 3051S Series Pressure Transmitter
November 2017
Rosemount 3051S Series Pressure Transmitter
PLINE_Learn_Sensitivity
The PLINE_LEARNING_SENSITIVITY parameter provides very specific adjustments to the sensitivity
during the learning phase. Most of the time, it is sufficient to use these default values:
 Insufficient Dynamics Check: Ignores the insufficient dynamic check if not selected. Use only when
there is very low process noise. This could result in a plugged impulse line not being detected.
 10%, 20%, and 30% Stdev. Change Check: Allows for 10, 20, or 30 percent change in standard deviation
while in the learning state. If this value is exceeded, the algorithm will stay in the verifying state until
the value is not exceeded.
 Three or Six Sigma Mean Change Check: Allows for a three or six standard deviations change in the
mean while in the learning state. If this value is exceeded, algorithm will stay in the verifying state until
the value is not exceeded.
 2% Mean Change Check: The mean value of the baseline calculation cannot vary more than two
percent during the learning or verifying states. If this value is exceeded, algorithm will stay in the
verifying state until the value is not exceeded.
You may want to increase or disable one or more of these learning sensitivity settings, if you find that the
PIL continues to stay in the verification phase.
6.24 PIL operation
During operation the PLINE_STATUS indicates the current status of the algorithm. The valid values are
shown in Tab le 1 3.
PIL also indicates the timestamp of the last detection of a plugged impulse line via these parameters:
PLINE_HISTORY_TIMESTAMP
Timestamp when the last plugged impulse line was detected.
PLINE_HISTORY_STATUS
Indicates whether a plugged impulse line has ever been detected.
6.25 PIL configuration in EDDL
Host systems that support EDDL may use labels for the PIL configuration parameters that are slightly
different from the F
OUNDATION Fieldbus parameter names described previously in this section. Tab le 1 4
shows the correspondence between the F
OUNDATION Fieldbus parameter names used in this document
and the labels used in EDDL hosts, such as AMS Device Manager.
Table 13. Pline Status
Value Description
OK The diagnostic is operating and has not detected a plugged impulse line.
Inactive The diagnostic is not currently operating.
Learning
The diagnostic is in the learning phase, establishing a baseline mean and standard
deviation.
Verifying The diagnostic is verifying the values established in the learning phase.
Insufficient Dynamics
The diagnostic did not measure enough process noise to establish a baseline value
during the learning phase.
Bad PV Status
The input value to the diagnostic has bad status and cannot be used to detect a
plugged impulse line.
Plugged Impulse Line The diagnostic is operating and has detected a plugged impulse line.