A1-7 – Yokogawa RAKD User Manual
Page 69
A1-7
IM 01R01B30-00E-E 5th edition February 01, 2013 -00
All Rights Reserved. Copyright © 2003, Rota Yokogawa
Table 5: Summary for RAKD ([V2]) with standard limit switches 7 – Failure rates
Profile 2
Profile 4
Fail Safe Detected (λSD)
0 FIT
0 FIT
Fail Safe Undetected (λSU)
192 FIT
246 FIT
Fail Dangerous Detected (λDD)
4 FIT
19 FIT
Fail Dangerous Undetected (λDU)
123 FIT
178 FIT
SFF
4
61.5%
59.8%
MTBF
321 years
346 years
SIL AC
5
SIL2
SIL1
Safety metrics according to ISO 13849-1
6
:
MTTF
d
(years)
899
579
DC
3%
10%
Category (CAT)
CAT 1
CAT 1
Performance Level (required)
PL
r
= c
PL
r
= c
Performance Level (calculated)
1.27E-07 1/h
1.97E-07 1/h
T[Proof] = 1 year
T[Proof] = 5 years
T[Proof] = 10 years
PFDAVG = 5.87E-04
PFDAVG = 2.72E-03
PFDAVG = 5.39E-03
Table 6: Summary for RAKD ([V3]) with fail-safe limit switches 3 – Failure rates
Profile 2
Profile 4
Fail Safe Detected (λSD)
0 FIT
0 FIT
Fail Safe Undetected (λSU)
232 FIT
334 FIT
Fail Dangerous Detected (λDD)
4 FIT
19 FIT
Fail Dangerous Undetected (λDU)
164 FIT
256 FIT
SFF
4
58.9%
58.1%
MTBF
262 years
168 years
SIL AC
5
SIL1
SIL1
Safety metrics according to ISO 13849-1
6
:
MTTF
d
(years)
679
415
DC
2%
7%
Category (CAT)
CAT 1
CAT 1
Performance Level (required)
PL
r
= c
PL
r
= c
Performance Level (calculated)
1.68E-07 1/h
2.57E-07 1/h
T[Proof] = 1 year
T[Proof] = 5 years
T[Proof] = 10 years
PFDAVG = 7.83E-04
PFDAVG = 3.63E-03
PFDAVG = 7.18E-03