Sinn EZM 7, User Manual, Page: 34 / 47

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Easy overview of times thanks to colour-coded bezel
When a mission requiring respiratory equipment gets under way, the bezel is
set so the “zero” point which corresponds to the current position of the minute
hand (zero position). this makes it possible to see precisely when the team
must be relieved, e.g. after 20 minutes in a chemical protection suit (Csa
green/ yellow), after 30 minutes with compressed air breathing apparatus
(pa yellow) and after max. 60 minutes with extended-time compressed air
breathing apparatus (lpa red). the black circle above the numbers 10, 20 and
40 also shows when 1/3 and 2/3 of the mission time has elapsed for 30 and
60 minute missions. this is an important detail because the monitoring officer
must remind the team to check the pressure level in the containers when
one-third and two-thirds of the expected mission time has elapsed.
In the case of nBC missions (nuclear, biological or chemical hazards), the
green scale can simultaneously be used to read off the time remaining
until level II decontamination (standard decontamination for missions
requiring special protective equipment). the regulations specify that level
II decontamination must be made available no later than 15 minutes after
emergency personnel enters the danger zone (green).
Added safety
the bezel with minute ratcheting can only be turned counter-clockwise, like
those of sInn diving watches. this ensures that even if the bezel is turned
inadvertently, the maximum time will never be exceeded (the worst that
can happen is that the mission is cut short).