INTRODUCTION
1
7
OPTIMASS 6400
www.krohne.com11/2017 - 4004960802 - AD OPTIMASS 6400 SIL R02 en
1.5 Related documentation
1.6 Terms and definitions
[N1] OPTIMASS 6000 Handbook
[N2] MFC 400 Handbook
[N3] IEC 61508-1 to 7:2010 Functional safety of electrical / electronic / programmable electronic safety-
related systems
[N4] Corrosion & Abrasion Guidelines for Coriolis Meter, OPTIMASS Corrosion
[N5] NAMUR Recommendation NE43: Standardization of the Signal Level for the Failure Information of
Digital Transmitters, Feb. 2003
[N6] NAMUR Recommendation NE107: "Requirements to Self-Monitoring and Diagnosis of Field
Devices", October 2006
Term Description
Firmware Software embedded in the device
FIT
Failure In Time (1x10
-9
failures per hour)
HFT Hardware Fault Tolerance
I/O Input / output
λ
DD
Rate for dangerous detected failure
λ
DU
Rate for dangerous undetected failure
λ
SD
Rate for safe detected failure
λ
SU
Rate for safe undetected failure
PFD
AVG
Average Probability of Failure on Demand
PFH Probability of a dangerous Failure per Hour
PTC Proof Test Coverage
Safe Current
Output (SCO)
Current output at terminal C
SFF Safe Failure Fraction
SIL Safety Integrity Level
SIS Safety Instrumented Systems
Type A system "Non-complex" system (all failure modes are well defined). For more data, refer to
subsection 7.4.3.1.2 of IEC 61508-2.
Type B system "Complex" system (all failure modes are not well defined). For more data, refer to
subsection 7.4.3.1.2 of IEC 61508-2.
T
Proof
Proof Test Interval
1oo1 1 out of 1 channel architecture (single channel architecture performs the safety
function)
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