KROHNE OPTISWITCH 3x00C NAMUR SIL EN - Manual (Page 10)

Overflow protection
(max. operation)
Dry run protection
(min. operation)
λ
sd
12 FIT 36 FIT
λ
su
160 FIT 155 FIT
λ
dd
390 FIT 366 FIT
λ
du
47 FIT 52 FIT
DC
S
7 % 19 %
DC
D
89 % 88 %
MTBF = MTTF + MTTR 1.56 x 10 6
h 1.56 x 10 6
h
Diagnosis test period < 100 sek.
Single channel architecture (1oo1D)
SIL SIL 2
HFT 0
Sensor type Type B
Overflow protection
(max. operation)
Dry run protection
(min. operation)
SFF 92 % 91 %
PFD
avg
T
Proof
= 1 year
T
Proof
= 5 years
T
Proof
= 10 years
< 0.021 x 10 -2
< 0.104 x 10 -2
< 0.207 x 10 -2
< 0.023 x 10 -2
< 0.114 x 10 -2
< 0.228 x 10 -2
PFH < 0.047 x 10 -6 /h < 0.052 x 10 -6 /h
The chronological sequence of PFD
avg
is nearly linear to the
operating time over a period up to 10 years. The above values
apply only to the T
Proof
interval after which a recurring function
test must be carried out.
Failure rates
Fault reaction time
Specific characteristics
Time-dependent proc-
ess of PFD
avg
10 OPTISWITCH series 3000 • - NAMUR
Functional safety
32742
-EN
-080414