Det-Tronics PIRECL Infrared Hydrocarbon Gas Detector PointWatch Eclipse SAFETY MANUAL User Manual
Page 7

5.1
95-8630
7
TErMS AND DEFiNiTioNS
AMS
Asset Management System
DU
Dangerous Undetected
FMEDA Failure Mode Effects and Diagnostics
Analysis
HART
Highway Addressable Remote Transducer
HFT
Hardware Fault Tolerance
LFL
Lower Flammable Limit
PFD
Probability of Failure on Demand
(Probability of Dangerous Failure)
PFDavg Average Probability of Failure on Demand
PIRECL Pointwatch Eclipse
®
IR Gas Detector
SFF
Safe Failure Fraction
SIF
Safety Instrumented Function
SIL
Safety Integrity Level
SIS
Safety Instrumented System
UD20 FlexVu
®
Model UD20 Universal Display
iEC 61508 Failure rates in FiT
1
Failure Category
l
sd
l
su
2
l
dd
l
du
SFF
3
PIRECL IR Gas Detector, Analog Output
0
46
1655
123
93.3
PIRECL IR Gas Detector, Relay Output
106
222
1335
130
92.7
PIRECL IR Gas Detector with UD20 Universal Display,
Analog Output
0
46
1691
142
92.5
PIRECL IR Gas Detector with UD20 Universal Display,
Relay Output
106
222
1371
149
91.9
1
FIT = 1 Failure / 10
9
Hours
2
It is important to realize that the No Effect failures are no longer included in the Safe Undetected Failure category according to IEC 61508,
ed2, 2010.
3
Safe Failure Fraction needs to be calculated on (sub)system level.
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