DescriptionTerm
Mission time: the period of time covering the intended use
of the safety function/device. After the mission time elapses,
the safety device must be replaced. Note that any T
M
values
given cannot be regarded as a guarantee or warranty. (EN
ISO 13849-1)
T
M
Potentially explosive atmosphere. Hazardous areas are di-
vided into zones, based on the frequency and duration of the
occurrence of an explosive atmosphere. (EN/IEC 60079)
Zone
20 Introduction to the manual
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