17
Pressure Transmitter Series 2000T and 265Ax, 265Gx, 265Vx, 265Dx, 265Jx, 267Cx, 269Cx
SM 265/7/9 SIL-EN
Instructions for Functional Safety
©
exida.com
GmbH
abb 03-09-13 r001 v1 r1.2, March 1, 2004
Stephan Aschenbrenner
Page 7 of 11
Table 8: Summary for version V2.2 – Failure rates
Failure category (Failure rates in FIT)
Fail-safe state =
“fail high”
Fail-safe state =
“fail low”
Fail High (detected by the logic solver)
Fail detected (int. diag.)
229
Fail high (inherently)
217
446
217
Fail Low (detected by the logic solver)
Fail detected (int. diag.)
229
Fail low (inherently)
16
16
245
Fail Dangerous Undetected
218
218
No Effect
156
156
Annunciation Undetected
1
1
Not part
54
54
MTBF = MTTF + MTTR
128 years
128 years
Transmitter configured fail-safe state = “fail high” – Failure rates according to IEC 61508
Failure Categories
O
sd
O
su
O
dd
O
du
SFF DC
S
²
DC
D
²
O
low
=
O
sd
O
high
=
O
dd
16 FIT
157 FIT
446 FIT
218 FIT
73%
9%
67%
O
low
=
O
dd
O
high
=
O
sd
446 FIT
157 FIT
16 FIT
218 FIT
73%
74%
7%
O
low
=
O
sd
O
high
=
O
sd
462 FIT
157 FIT
0 FIT
218 FIT
73%
75%
0%
Transmitter configured fail-safe state = “fail low” – Failure rates according to IEC 61508
Failure Categories
O
sd
O
su
O
dd
O
du
SFF DC
S
²
DC
D
²
O
low
=
O
sd
O
high
=
O
dd
245 FIT
157 FIT
217 FIT
218 FIT
73%
61%
50%
O
low
=
O
dd
O
high
=
O
sd
217 FIT
157 FIT
245 FIT
218 FIT
73%
58%
53%
O
low
=
O
sd
O
high
=
O
sd
462 FIT
157 FIT
0 FIT
218 FIT
73%
75%
0%
Table 9: Summary for version V2.2 – PFD
AVG
values
T[Proof] = 1 year
T[Proof] = 5 years
T[Proof] = 10 years
PFD
AVG
= 9,54E-04
PFD
AVG
= 4,76E-03
PFD
AVG
= 9,49E-03
