Emerson 3051S Dokumentacja Pobierz pdf (Strona 84)

Reference Manual

00809-0200-4801, Rev CA

July 2010

Rosemount 3051S

6-6

NOTE:

The Statistical Process Monitoring diagnostic capability in the Rosemount

3051S F

OUNDATION fieldbus Pressure Transmitter calculates and detects

significant changes in statistical parameters derived from the input process

variable. These statistical parameters relate to the variability of and the noise

signals present in the process variable. It is difficult to predict specifically

which noise sources may be present in a given measurement or control

application, the specific influence of those noise sources on the statistical

parameters, and the expected changes in the noise sources at any time.

Therefore, Rosemount cannot absolutely warrant or guarantee that Statistical

Process Monitoring will accurately detect each specific condition under all

circumstances.

SPM CONFIGURATION

AND OPERATION

The following section describes the process of configuring and using the

Statistical Process Monitoring diagnostic.

SPM Configuration for

Monitoring Pressure

Most Advanced Diagnostics Applications require using the device’s pressure

measurement as the SPM input. To configure the first SPM Block (SPM1) to

monitor the pressure set the following parameters:

SPM1_Block_Tag = TRANSDUCER

NOTE:

By default, as shipped from the factory, the tag of the sensor transducer block

is “TRANSDUCER”. DeltaV does not change the transducer block tags when

the device is installed and commissioned. However, it is possible that other

Fieldbus host systems may change the transducer block tags. If this happens,

SPM#_Block_Tag must be set to whatever tag was assigned by the host.

SPM1_Block_Type = TRANSDUCER Block

SPM1_Parameter_Index = Pressure (inH

O @ 68 °F)

SPM1_User_Command = Learn

(optional) SPM_Monitoring_Cycle = [1 – 5] minutes (see “Other SPM

Settings” on page 6-7)

(optional) SPM_Bypass_Verification = [Yes/No] (see page 6-7)

Apply all of these above changes to the device. Finally, set

SPM_Active = Enabled with 1st-order HP Filter

After SPM is enabled, it will spend the first 5 (whatever the

SPM_Monitoring_Cycle is set to) minutes in the learning phase, and then

another 5 minutes in the verification phase. If a steady process is detected at

the end of the verification phase, the SPM will move into the monitoring

phase. After 5 minutes in the monitoring phase, SPM will have the current

statistical values (e.g. current mean and standard deviation), and will begin

comparing them against the baseline values to determine if an SPM Alert is

detected.

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