Failure Rates - JUMO Ex-i Safety Manual

6.8

Failure rates

Non-inverting operation

S
187 FIT
252 FIT
177 FIT
232 FIT
Inverting operation

S
189 FIT
254 FIT
179 FIT
234 FIT
Low-demand mode
T
[PROOF]
PFD =
avg
PFD =
avg
PFD =
avg
PFD =
avg
PFD =
avg
PFD =
avg
PFD =
avg
PFD =
avg
The PFD
avg
from IEC/EN 61508-1. They meet the requirement of not covering more than 10 % of the safety circuit
or are better than or equal to 1.00 × 10
The PFD
avg
IEC/EN 61508-1. However, they do meet the requirement of not covering more than 10 % of the safety
circuit or are not better than or equal to 1.00 × 10
 
DD DU
6 FIT 48 FIT
6 FIT 83 FIT
6 FIT 83 FIT
6 FIT 103 FIT
 
DD DU
6 FIT 106 FIT
56 FIT 86 FIT
6 FIT 61 FIT
6 FIT 106 FIT
= 1 year 2 years
-4
2.1 × 10 4.2 × 10
-4
3.63 × 10 7.26 × 10
-4
2.22 × 10 4.44 × 10
-4
3.75 × 10 7.5 × 10
-4
2.54 × 10 5.08 × 10
-4
4.51 × 10 9.02 × 10
-4
2.65 × 10 5.3 × 10
-4
4.64 × 10 9.28 × 10
values for 1, 2, and 3 years are within the permissible range for SIL 2 according to table 2
values for 4 and 5 years are within the permissible range for SIL 2 according to table 2 from
6 Safety-related applications
SFF DC
avg
80 % 9 %
76 % 7 %
76 % 9 %
70 % 6 %
SFF DC
avg
79.4 % 9 %
75.2 % 5 %
75.3 % 9 %
69.4 % 5 %
3 years 4 years
-4 -4
6.3 × 10 8.4 × 10
-4
-4 -4
6.66 × 10 8.88 × 10
-4
-4 -4
7.62 × 10 1.16 × 10
-4
-4 -4
7.95 × 10 1.6 × 10
-4
-3
.
-3
.
MTBF Function
227 years Normally open contact
(RNO) C1
189 years Normally open contact
(RNO) C2
227 years Normally closed contact
(RNC) C5
189 years Normally closed contact
(RNC) C6
MTBF Function
227 years Normally open contact
(RNO) C3
189 years Normally open contact
(RNO) C4
227 years Normally closed contact
(RNC) C7
189 years Normally closed contact
(RNC) C8
5 years Function
-4 -3
1.05 × 10 Normally open contact
(RNO) C1
Normally open contact
(RNO) C2
-4 -3
1.11 × 10 Normally open contact
(RNO) C3
Normally open contact
(RNO) C4
-3
Normally closed contact
(RNC) C5
Normally closed contact
(RNC) C6
-3
Normally closed contact
(RNC) C7
Normally closed contact
(RNC) C8
23