Emerson 3051S Especificaciones descargar pdf (Pagina 107)

Reference Manual

00809-0200-4801, Rev CA

July 2010

Rosemount 3051S

6-29

Advanced PIL

Configuration

PIL provides the ability for advanced users to fine-tune some of the algorithm

settings

PLINE_Relearn_Threshold

This adjusts the limit at which the PIL will automatically relearn new

baseline values if the process mean changes. By default, this threshold is:

2 inches of water for DP Range 1 (-25 to 25 inH

O) sensors

5 inches of water for DP Range 2 (-250 to 250 inH

O) sensors

1% of Primary Value Range for All Other Sensors

When PLINE_Relearn_Threshold is at 0 (default) the above values are

used for the relearn threshold. When a positive number is entered here,

this value (in % of Primary Value range) overrides the default relearn

threshold values. For example, if the sensor is type DP Range 3 (-1000 to

1000 inH

O), and PLINE_Relearn_Threshold is set to 2%, then PIL will

relearn if the mean changes by more than 20 inH

NOTE

In software revisions 2.0.x and previous, the Relearn Thresholds for DP

Range 1 and DP Range 2 are fixed at the above default values. The

PLINE_Relearn_Threshold parameter affects the Relearn Threshold for only

the other sensors. In software revisions 2.1.x and later, the

PLINE_Relearn_Threshold affects the Relearn threshold for all sensor types.

PLINE_Auto_Relearn

This can be used to turn off the automatic relearning. If set to “Disabled”,

the PIL will not go back into learning mode, even if there is a large mean

change. In most cases, this parameter should be kept at “Enabled”

because without this check, a large change in a flow rate could also cause

a change in the standard deviation, triggering a false detection.

PLINE_Learn_Length

The length of time over which mean and standard deviation are calculated

during the Learning and Verification phases. Default is 5 minutes.

Allowable range is 1-45 minutes. If the process has a periodic change in

the mean over time (e.g. a slow oscillation), a longer learning cycle may

provide a better baseline.

PLINE_Detect_Length

The length of time over which mean and standard deviation are calculated

during the Detection Phase. Default is 1 minute. Allowable range is 1-45

minutes. This value should not be longer than the PLINE Learning Cycle.

A shorter value will in general allow a plugged impulse line to be detected

more quickly. However, if the process has a dominant cycling or oscillation,

this parameter should be set to longer than the period of oscillation.

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