16
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 6 of 11
Table 6: Summary for version V2.1 – 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)
202
391
202
Fail Low (detected by the logic solver)
Fail detected (int. diag.)
189
Fail low (inherently)
15
15
204
Fail Dangerous Undetected
198
198
No Effect
127
127
Annunciation Undetected
1
1
Not part
54
54
MTBF = MTTF + MTTR
145 years
145 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
128 FIT
391 FIT
198 FIT
73%
10%
66%
O
low
=
O
dd
O
high
=
O
sd
391 FIT
128 FIT
15 FIT
198 FIT
73%
75%
7%
O
low
=
O
sd
O
high
=
O
sd
406 FIT
128 FIT
0 FIT
198 FIT
73%
76%
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
128 FIT
202 FIT
198 FIT
73%
61%
51%
O
low
=
O
dd
O
high
=
O
sd
202 FIT
128 FIT
204 FIT
198 FIT
73%
61%
51%
O
low
=
O
sd
O
high
=
O
sd
406 FIT
128 FIT
0 FIT
198 FIT
73%
76%
0%
Table 7: Summary for version V2.1 – PFD
AVG
values
T[Proof] = 1 year
T[Proof] = 5 years
T[Proof] = 10 years
PFD
AVG
= 8,65E-04
PFD
AVG
= 4,31E-03
PFD
AVG
= 8,60E-03
