Yokogawa EJA440E Bedienungsanleitung PDF herunterladen (Seite 39)

A1-2

IM 01C25T03-01E

Table A1.2 Proof Testing

Testing method Tools required Expected outcome Remarks

Functional test:

1. Follow all Management of

Change procedures to bypass

logic solvers if necessary.

2. Execute HART/BRAIN

command to send value to

high alarm (21.5 mA) and

verify that current has reached

this level.

3. Execute HART/BRAIN

command to send value to

low alarm (3.6 mA) and verify

that current has reached this

level.

4. Restore logic solvers

operation and verify.

• Handheld terminal Proof Test Coverage =52% The output needs to

be monitored to assure

that the transmitter

communicates the

correct signal.

Perform three point calibration

along with the functional test listed

above.

• Handheld terminal

• Calibrated pressure

source

Proof Test Coverage =99%

A1.2.6 Repair and Replacement

If repair is to be performed with the process online

the transmitter will need to be bypassed during the

repair. The user should setup appropriate bypass

procedures.

In the unlikely event that the transmitter has a

failure, the failures that are detected should be

reported to Yokogawa.

When replacing the transmitter, the procedure in the

installation manual should be followed.

The personnel performing the repair or replacement

of the transmitter should have a sufcient skill level.

A1.2.7 Startup Time

The transmitter generates a valid signal within 1

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 transmitter is certied up to SIL2 for use

in a simplex (1oo1) conguration, depending

on the PFDavg calculation of the entire Safety

Instrumented Function.

The development process of the transmitter is

certied up to SIL3, allowing redundant use of

the transmitter up to this Safety Integrity Level,

depending the PFDavg calculation of the entire

Safety Instrumented Function.

When using the transmitter in a redundant

conguration, the use of a common cause factor

(β-factor) of 2% is suggested. (However, if the

redundant transmitters share an impulse line or if

clogging of the separate impulse lines is likely, a

common cause factor of 10% is suggested.)

Note that the failure rates of the impulse lines need

to be accounted for in the PFDavg calculation.

A1.2.10 Lifetime Limits

The expected lifetime of the transmitter is 50

years. The reliability data listed the FMEDA report

is only valid for this period. The failure rates of the

transmitter may increase sometime after this period.

Reliability calculations based on the data listed

in the FMEDA report for the transmitter lifetimes

beyond 50 years may yield results that are too

optimistic, i.e. the calculated Safety Integrity Level

will not be achieved.

A1.2.11 Environmental Limits

The environmental limits of the transmitter are

specied in the user’s manual IM 01C25.

A1.2.12 Application Limits

The application limits of the transmitters are

specied in the user’s manual IM 01C25. If the

transmitter is used outside of the application limits,

the reliability data listed in A1.2.9 becomes invalid.

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