Dräger Multi-PID 2, Руководство пользователя, Страница: 60 / 107

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Menu Functions
In STEL mode, 15 samples are combined to form a 15-minute aver-
age. Once every minute, the oldest of the 15 samples is replaced with
a new one-minute average. This moving average provides a 15-minute
average with a one-minute update rate so the meter display will only
update once every minute. STEL is set to zero each time the instru-
ment is turned on.
STEL calculations are always being performed by the Multi-PID 2. You
can display the results of the calculations by selecting STEL as the
Display mode.
In REAL mode, the reading is updated once a second. In the back-
ground, the Multi-PID 2 datalogger is sampling the concentration and
measuring min, max, and average concentrations for the selected
averaging interval. At the end of every interval, one entry is placed in
the datalogger until the datalogger is full.
TWA mode sums concentrations every second until 8 hours of data
have been accumulated. Once 8 hours of data have been summed,
the accumulation stops.
This sum will only be complete after 8 hours, so the meter displays
the current sum divided by 8 hours. While you are in TWA mode, the
time on the status display will show the number of minutes and hours
of data that TWA has accumulated. When this reaches 8 hours, the
Multi-PID 2 stops accumulating data and the TWA is complete.
TWA calculations are always being performed by the Multi-PID 2. You
can display the results of the calculations by selecting TWA as the
Display mode.
Interval mode logs readings at user-selected intervals of 3 seconds to
900 seconds.