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Stratos-Micra • INSTALLER’S HANDBOOK • Iss. 16
4.2 Histogram screen
The histogram screen shows various aspects of the detector function. To enter the
histogram screen, either select the menu options “View ‘ Histogram viewer…” or click
the symbol indicated below.
The following screen appears:
Smoke density
histogram
Alarm flags
There are two types of smoke density histogram; one shown in blue (the “fast” histo-
gram) which updates every 15 minutes, feeding information to the long-term “slow”
histograms (which appear in yellow). These set the detector sensitivity based on the
ambient smoke conditions and it takes 24 hours for the two slow histograms (the
“day” and the “night” histograms) to complete their learning phase (see section 3.7).
Detector sensitivity is based on the fast histogram during FastLearn and is thereafter
based on the currently active slow histogram. However, although the positions of the
alarm flags are based on the slow histogram, sudden changes in smoke density are
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