Emerson 3051S Specifikace stáhnout pdf (Strana 108)

Reference Manual

00809-0200-4801, Rev CA

July 2010

Rosemount 3051S

6-30

PLINE_Learn_Sensitivity

The PLINE_Learn_Sensitivity parameters provide very specific

adjustments to the sensitivity during the learning phase. Most of the time, it

is sufficient to use the 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%

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 2% 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.

PIL Operation During operation the PIL_Status indicates the current status of the algorithm.

The valid values are:

PIL also indicates the timestamp of the last detection of a plugged impulse

line via the parameters:

PLINE_History_Timestamp

Timestamp when the last plugged impulse line was detected.

PLINE_History_Status

Indicates whether or not the PIL_History_Timestamp is available.

OK Algorithm is in the detection state, and no plugged impulse line is

detected.

Inactive The algorithm is not enabled.

Learning Algorithm is currently learning the process characteristics

Verifying Algorithm is comparing the learned baseline with the current

process.

Insufficient Dynamics The process does not have enough dynamics to detect an impulse

line plug

Bad PV Status The Sensor Transducer Status is Bad, therefore the algorithm is

paused. Algorithm will resume when a good or uncertain status

returns.

Not Licensed The ADB is not currently purchased in this device.

Plugged Line Algorithm has detected a plugged line condition. This could be

either one line or both lines plugged for a DP transmitter, or the one

impulse line plugged for a GP or AP transmitter.

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