Manual

<A1. SAFETY INSTRUMENTED SYSTEMS INSTALLATION>
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

Prole 2 Prole 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

Prole 2 Prole 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