Honeywell BCU 465 - Probability of Dangerous Failure PFHD; Mean Time to Dangerous Failure MTTF D

BCU 460, BCU 465 · Edition 11.19 144
Glossary
23.15 Probability of dangerous failure PFH
D
Value describing the likelihood of dangerous failure per
hour of a component for high demand mode or con-
tinuous mode. Unit: 1/h.
from EN13611/A2:2011
23.16 Mean time to dangerous failure
MTTF
d
Expectation of the mean time to dangerous failure
from ENISO 13849-1:2008