KROHNE OPTISWITCH 5xx0C NAMUR SIL EN - Manual (Page 9)

Overflow protection
(max./A-operation)
Dry run protection
(min./B-operation)
λ
sd
9 FIT 9 FIT
λ
su
203 FIT 202 FIT
λ
dd
9 FIT 9 FIT
λ
du
43 FIT 45 FIT
MTBF = MTTF + MTTR 3.79 x 10 6
h 3.79 x 10 6
h
Fault reaction time < 1.5 sec.
Single channel architecture (1oo1D)
SIL SIL 2
HFT 0
Sensor type Type A
Overflow protection
(max./A-operation)
Dry run protection
(min./B-operation)
SFF 83 % 83 %
PFD
avg
T
Proof
= 1 year
T
Proof
= 5 years
T
Proof
= 10 years
< 0.019 x 10 -2
< 0.095 x 10 -2
< 0.189 x 10 -2
< 0.020 x 10 -2
< 0.097 x 10 -2
< 0.195 x 10 -2
PFH < 0.043 x 10 -6 /h < 0.045 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
OPTISWITCH series 5000 • - NAMUR 9
1 Functional safety
32747
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EN
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100128