<A2. SAFETY INSTRUMENTED SYSTEMS INSTALLATION>
A2-4
IM 01R01B02-00E-E 12th edition October 01, 2014 -00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
A2.2.11 Environmental limits
The environmental limits of Rota Yokogawa RAMC variable area ow meter are specied in the User’s
Manual, Model RAMC Short Stroke ROTAMETER IM 01R01B02-00E-E.
A2.2.12 Application limits
The application limits of the Rota Yokogawa RAMC variable area ow meter are specied in the User’s
Manual, Model RAMC Short Stroke ROTAMETER,
IM 01R01B02-00E-E. If the ow meter is used outside of the application limits the reliability data listed in
A2.2.9 becomes invalid.
A2.3 Denitions and Abbreviations
A2.3.1 Denitions
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 dened 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
Verication The demonstration for each phase of the life-cycle that the (output)
deliverables of the phase meet the objectives and requirements specied
by the inputs to the phase. The verication 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 Requirements Specication.
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
Further denitions of terms used for safety techniques and measures and the description of safety related
systems are given in IEC 61508-4.
A2.3.2 Abbreviations
FMEDA Failure Mode, Effects and Diagnostic Analysis
SIF Safety Instrumented Function
SIL Safety Integrity Level
SIS Safety Instrumented System
SLC Safety Lifecycle
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