20
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 10 of 11
Table 14: Summary for version V5 – 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.)
189
Fail high (inherently)
197
386
197
Fail Low (detected by the logic solver)
Fail detected (int. diag.)
189
Fail low (inherently)
15
15
204
Fail Dangerous Undetected
222
222
No Effect
115
115
Annunciation Undetected
1
1
Not part
53
53
MTBF = MTTF + MTTR
144 years
144 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
15 FIT
116 FIT
386 FIT
222 FIT
69%
11%
64%
O
low
=
O
dd
O
high
=
O
sd
386 FIT
116 FIT
15 FIT
222 FIT
69%
77%
6%
O
low
=
O
sd
O
high
=
O
sd
401 FIT
116 FIT
0 FIT
222 FIT
69%
78%
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
204 FIT
116 FIT
197 FIT
222 FIT
69%
64%
47%
O
low
=
O
dd
O
high
=
O
sd
197 FIT
116 FIT
204 FIT
222 FIT
69%
63%
48%
O
low
=
O
sd
O
high
=
O
sd
401 FIT
116 FIT
0 FIT
222 FIT
69%
78%
0%
Table 15: Summary for version V5 – PFD
AVG
values
T[Proof] = 1 year
T[Proof] = 5 years
T[Proof] = 10 years
PFD
AVG
= 9,71E-04
PFD
AVG
= 4,84E-03
PFD
AVG
= 9,66E-03
