14
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 4 of 11
Table 2: Summary for version V1.1 – 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.)
216
Fail high (inherently)
245
461
245
Fail Low (detected by the logic solver)
Fail detected (int. diag.)
216
Fail low (inherently)
15
15
231
Fail Dangerous Undetected
195
195
No Effect
137
137
Annunciation Undetected
1
1
Not part
54
54
MTBF = MTTF + MTTR
132 years
132 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
138 FIT
462 FIT
195 FIT
75% 10% 70%
O
low
=
O
dd
O
high
=
O
sd
461 FIT
138 FIT
15 FIT
195 FIT
75% 77% 7%
O
low
=
O
sd
O
high
=
O
sd
476 FIT
138 FIT
0 FIT
195 FIT
75% 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
231 FIT
138 FIT
245 FIT
195 FIT
75% 63% 56%
O
low
=
O
dd
O
high
=
O
sd
245 FIT
138 FIT
231 FIT
195 FIT
75% 64% 54%
O
low
=
O
sd
O
high
=
O
sd
476 FIT
138 FIT
0 FIT
195 FIT
75% 78% 0%
Table 3: Summary for version V1.1 – PFD
AVG
values
T[Proof] = 1 year
T[Proof] = 5 years
T[Proof] = 10 years
PFD
AVG
= 8,54E-04
PFD
AVG
= 4,26E-03
PFD
AVG
= 8,50E-03
2
DC means the diagnostic coverage (safe or dangerous) of the safety logic solver for pressure
transmitter 2600T / 2000T Series with 4..20 mA output.
