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6 safety manual – JUMO 701150 14597 safetyM STB/STW - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual User Manual

Page 40

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6 Safety Manual

2014-05-01

40

Lambda:

λ

SU

Rate of undetected safe failures per hour

BPCS

Basic Process Control System

DC

D

iagnostic Coverage

FIT

Failures In Time (1x10

-9

per h)

HFT

Hardware Fault Tolerance

PFD

Probability of Failure on Demand

PFD

avg

Average Probability of Failure on Demand

MooN

Architecture with M from N channels

MTBF

Mean Time Between Failures

MTTR

Mean Time To Repair

SFF

Safe Failure Fraction

SIL

Safety Integrity Level

Name

Description