Yokogawa ADMAG AXR Uživatelský manuál stáhnout pdf (Strana 188)

<Appendix1. Safety Instrumented Systems Installation>

A1-3

IM 01E30D01-01EN

A1.2.10 Lifetime Limits

TheexpectedlifetimeoftheAXRis10years.The

reliability data listed the FMEDA report is only valid

forthisperiod.ThefailureratesoftheAXRmay

increase sometime after this period. Reliability

calculations based on the data listed in the FMEDA

reportforAXRlifetimesbeyond10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AXRarespeciedin

the user’s manual IM 01E30D01-01E.

A1.2.12 Application Limits

TheapplicationlimitsoftheAXRarespeciedinthe

user’smanualIM01E30D01-01E.Iftheowmeter

is used outside of the application limits, the

reliability data listed in A1.2.9 becomes invalid.

A1.3 Denitionsand

Abbreviations

A1.3.1 Denitions

Safety Freedom from unacceptable

risk of harm

Functional Safety The ability of a system to carry

out the actions necessary

to achieve or to maintain a

enedsafestateforthe

equipment/machinery/plant/

apparatus under control of the

system

Basic Safety The equipment must be

designed and manufactured

such that it protects against

risk of damage to persons

by electrical shock and other

hazards and against resulting



reandexplosion.The

protection must be effective

under all conditions of the

nominal operation and under

single fault condition

Verication Thedemonstrationforeach

phase of the life-cycle that the

(output) deliverables of the

phase meet the objectives

ndrequirementsspeciedby

the inputs to the phase. The

vericationisusuallyexecuted

by analysis and/or testing

Validation The demonstration that the

safety-related system(s) or

the combination of safety-

related system(s) and external

risk reduction facilities meet,

in all respects, the Safety

equirementsSpecication.

The validation is usually

executed by testing

Safety Assessment The investigation to arrive at a

judgment -based on evidence-

of the safety achieved by

safety-related systems

urtherdenitionsoftermsusedforsafety

techniques and measures and the description of

safety related systems are given in IEC 61508-4.

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