KROHNE OPTISWITCH 5xx0C NAMUR SIL EN - Manual (Page 3)

1 Functional safety
1 .1 In general
This safety manual applies to measuring systems consisting of the
vibrating level switch OPTISWITCH series 5000 with integrated
oscillator SWE60N:
OPTISWITCH 5100 C, 5150 C, 5200 C, 5250 C
For instruments with enamelled fork, oscillator SWE60N.E or
SWE
60N.E1 is required.
The measuring system can be implemented for level detection (of
liquids) which meets the special requirements of safety technology.
This is possible up to SIL2 in a single channel architecture (1oo1D),
and up to SIL3 in a multiple channel, redundant architecture.
The SIL declaration of conformity can be downloaded from our
homepage in the Internet.
SIL Safety Integrity Level
HFT Hardware Fault Tolerance
SFF Safe Failure Fraction
PFD
avg
Average Probability of dangerous Failure on Demand
PFH Probability of a dangerous Failure per Hour
FMEDA Failure Mode, Effects and Diagnostics Analysis
λ
sd
Rate for safe detected failure
λ
su
Rate for safe undetected failure
λ
dd
Rate for dangerous detected failure
λ
du
Rate for dangerous undetected failure
DC
S
Diagnostic Coverage of safe failures; DC
S
= λ
sd
/(λ
sd
+ λ
su
)
DC
D
Diagnostic Coverage of dangerous failures; DC
D
= λ
dd
/(λ
dd
+ λ
du
)
FIT Failure In Time (1 FIT = 1 failure/10
9
h)
MTBF Mean Time Between Failure
MTTF Mean Time To Failure
MTTR Mean Time To Repair
Further abbreviations and terms are stated in IEC 61508-4.
Scope
Area of application
SIL conformity
Abbreviations, terms
OPTISWITCH series 5000 • - NAMUR 3
1 Functional safety
32747
-
EN
-
100128