18
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 8 of 11
Table 10: Summary for version V3 – 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.)
210
Fail high (inherently)
1300
1510
1300
Fail Low (detected by the logic solver)
Fail detected (int. diag.)
210
Fail low (inherently)
15
15
225
Fail Dangerous Undetected
558
558
No Effect
124
124
Annunciation Undetected
1
1
Not part
54
54
MTBF = MTTF + MTTR
50 years
50 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
125 FIT 1510 FIT
558 FIT
74%
11%
73%
O
low
=
O
dd
O
high
=
O
sd
1510 FIT 125 FIT
15 FIT
558 FIT
74%
92%
3%
O
low
=
O
sd
O
high
=
O
sd
1525 FIT 125 FIT
0 FIT
558 FIT
74%
92%
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
225 FIT
125 FIT 1300 FIT
558 FIT
74%
64%
70%
O
low
=
O
dd
O
high
=
O
sd
1300 FIT 125 FIT
225 FIT
558 FIT
74%
91%
29%
O
low
=
O
sd
O
high
=
O
sd
1525 FIT 125 FIT
0 FIT
558 FIT
74%
92%
0%
Table 11: Summary for version V3 – PFD
AVG
values
T[Proof] = 1 year
T[Proof] = 3 years
T[Proof] = 5 years
PFD
AVG
= 2,44E-03
PFD
AVG
= 7,29E-03
PFD
AVG
= 1,21E-02
