Safety Manual For Sil Applications; Relevant Standards; Terms And Definitions - GE Masoneilan 12420 Instruction Manual & Safety Manual

8. Safety manual for SIL applications

8.1. RELEVANT STANDARDS

a. IEC 61508 (also available as DIN EN)
Functional safety of electrical/electronic/programmable electronic safety-related systems
b. IEC 61511 (also available as DIN EN)
Functional safety - safety-instrumented systems for the process industry sector

8.2. TERMS AND DEFINITIONS

FIT
FMEDA
HFT
Low Demand mode
MTTR
PFD
avg
Safety Accuracy
SFF
SIF
SIL
SIS
Type A component
Type B component
λ
sd
λ
su
λ
dd
λ
du
44 | GE Oil & Gas
Failure In Time (1x10 failures per hour)
-9
Failure Mode Effect and Diagnostic Analysis
Hardware Fault Tolerance
Mode, where the frequency of demands for operation made on a non-safety related system is no
greater than twice the proof test frequency
Mean Time To Repair
Average Probability of Failure on Demand
The measurement error that occurs due to component degradation and failure during the useful life
of an instrument.
Safe Failure Fraction, summarizes the fraction of failures, which leads to a safe state and the
fraction of failures which will be detected by diagnostic measures and lead to a defined safety
action
Safety Instrumented Function
Safety Integrity Level
Safety Instrumented System – Implementation of one or more Safety Instrumented Function. A SIS
is composed of any combination of sensor(s), logic solver(s), and final element(s).
"Non-Complex" component (using discrete elements); for details see IEC 61508-2
"Complex" component (using micro controllers or programmable logic); for details see IEC 61508-2
Rate for Safe Detected failure
Rate for Safe Undetected failure
Rate for Dangerous Detected failure
Rate for Dangerous Undetected failures
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