Endress+Hauser Gammapilot M FMG60 - Appendix; Notes on the Redundant Connection of Multiple Sensors for SIL

Gammapilot M
Endress+Hauser 19
Appendix
Notes on the redundant
connection of multiple sensors
for SIL 3
With redundant connection with HFT = 1 (e.g. coincidence logic 1oo2 or 2oo3), the Gammapilot M meets the
requirements for SIL 3.
The common cause factors ß and ß
D
indicated in the table below are minimum values for the Gammapilot M.
These values should be used when calculating the failure probability of redundantly connected Gammapilot M
units as per IEC 61508-6.
The system-specific observation can return higher values depending on the actual installation and the use of
other components (e.g. Ex barriers).
Minimum value ß with homogeneous redundant use 5 %
Minimum value ß
D
with homogeneous redundant use 2 %