Honeywell TC Series

TC · Edition 08.17 54
Glossary
10.7 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
see EN 13611/A2
10.8 Mean time to dangerous failure MTTF
d
Expectation of the mean time to dangerous failure
see EN ISO 13849-1