Yokogawa ADMAG AXR Uživatelský manuál stáhnout pdf (Strana 187)

<Appendix1. Safety Instrumented Systems Installation>

A1-2

IM 01E30D01-01EN

Table A1.2 Proof Testing

Testing method Tools required Expected outcome Remarks

Analog Output Loop Test and Calibration

.BypassthesafetyPLCorthenal

element interface or take other

appropriate action to avoid a false trip.

●

AnalogOutputLoopTest:

2. Send a HART or BRAIN command to

the Magnetic Flowmeter to go to the

high alarm current output and verify that

the analog current reaches that value

and verify that discrete contact has de-

energized (if used)

3. Send a HART or BRAIN command to

the Magnetic Flowmeter to go to the low

alarm current output and verify that the

analog current reaches that value.

4. Use the HART or BRAIN communicator

to view detailed device status to ensure

no alarms or warnings are present in the

Magnetic Flowmeter.

5. Perform reasonability check on the

sensor value(s) versus an independent

estimate (i.e. from direct monitoring of

BPCS value) to show current reading is

good.

●Calibration

.Verifythemeasurementfortwoow

points.

7. Restore the loop to full operation.

8. Remove the bypass from the safety PLC

or otherwise restore normal operation.

• BT200

•

HARTconguration

tool

Proof Test Coverage

=96%

The output needs to be

monitored to assure that

the Magnetic Flowmeter

communicates the correct

signal.

A1.2.6 Repair and Replacement

If repair is to be performed with the process online

theAXRwillneedtobebypassedduringthe

repair. The user should setup appropriate bypass

procedures.

IntheunlikelyeventthattheAXRhasafailure,the

failures that are detected should be reported to

Yokogawa.

henreplacingtheAXR,theprocedureinthe

installation manual should be followed.

The personnel performing the repair or replacement

ftheAXRshouldhaveasufcientskilllevel.

A1.2.7 Startup Time

TheAXRgeneratesavalidsignalwithin10second

of power-on startup.

A1.2.8 Firmware Update

Incasermwareupdatesarerequired,they

will be performed at factory. The replacement

responsibilities are then in place. The user will not

berequiredtoperformanyrmwareupdates.

A1.2.9 Reliability Data

A detailed Failure Mode, Effects, and Diagnostics

Analysis (FMEDA) report is available from

Yokogawa with all failure rates and failure modes.

TheAXRiscertieduptoSIL2foruseinasimplex

(1oo1)conguration,dependingonthePFDavg

respectively PFH calculation of the entire Safety

Instrumented Function.

hedevelopmentprocessoftheAXRiscertiedup

to SIL3, allowing redundant use of the transmitter

up to this Safety Integrity Level, depending the

PFDavg respectively PFH calculation of the entire

Safety Instrumented Function.

When using the transmitter in a redundant

onguration,theuseofacommoncausefactor

(β-factor)of5%issuggested.Iftheowner-operator

of the plant would institute common cause failure

training and more detailed maintenance procedures

for avoiding common cause failure, a beta factor of

2% would be applicable.

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