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Verfügbare Sprachen
Verfügbare Sprachen
0 About this manual
0.3 Abbreviations and symbols
0.3 Abbreviations and symbols
28
Symbols used in this manual have the following meanings:
Ex e
Type of protection "Increased Safety"
HFT
Hardware-Fault-Tolerance
HM
Highest possible set current
NM
Lowest possible setting current
PL
Performance Level
PTB
Physikalisch Technische Bundesanstalt German Federal Testing Laboratory:
Accredited certification authority for devices operated in Ex e areas.
SIL
Safety integrity level
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