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Stratos-Micra • INSTALLER’S HANDBOOK • Iss. 16
picked up by the fast histogram so that early warning is given.
Sensitivity: The current absolute sensitivity of the detector in percentage obscura-
tion per metre (% obs/m)
Mean: The current mean value of smoke density, taken from the currently “active”
histogram and given as a percentage of full scale deflection.
Variance: The “spread” of data in the currently “active” histogram and given as a
percentage of full scale deflection.
FastLearn: If the detector is currently in FastLearn mode, this will show the number
of minutes remaining in the FastLearn period. When this period has elapsed it will read
“OFF”.
Alarm factor: This is the ClassiFire alarm factor (see section 3.5, “Alarm factor”)
Day/night: This indicates the currently active slow histogram
Alarm levels: These figures give the position of the various alarm flags in terms of a
percentage of full scale deflection.
Detector output: This shows the real-time variation in background smoke levels in
terms of a percentage of full scale deflection.
4.3 Chart recording
The chart recording function shows how smoke density in the protected area has var-
ied over time. The chart may be downloaded to disk or printed out from a connected
printer.
To access the chart log, select the menu options “View ‘ Chart recording…” or click
the symbol indicated below.
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