F - 1
Appendix F
Envirolink is an optional feature that
permits MXL to compensate automati-
cally for environmental changes (such
as dirt and dust buildup) in the analog
voltage of an I Series photo or ion smoke
detector. The selection of Envirolink
devices is made in the CSG-M.
Once a detector is chosen to be
covered by Envirolink, MXL stores and
analyzes the analog readings of the
smoke detector and adjusts the
detectors threshold upward or down-
ward, as necessary, to maintain a
constant sensitivity.
As the analog voltage increases due to
environmental factors, an equivalent
increase in the detectors alarm thresh-
old prevents factors other than smoke
from causing an alarm. This method
maintains the selected detectors
sensitivity.
Typically, the analog voltage changes
slowly over long periods of time for
environmental factors, but changes
quickly over short periods of time for
actual smoke.
Initial System Power-Up
When a new or modified CSG-M is
loaded into a system, the MXL control
panel goes through an initial system
power-up. The MXL does not keep the
Envirolink
Envirolink option where it was formerly
applied when this new system powers
up. The Envirolink memory re-initializes,
and then MXL begins adjusting the
alarm thresholds wherever Envirolink is
selected in the new CSG-M.
Adjusting the Alarm Threshold
When a New CSG-M is Uploaded
After MXL checks that the actual ID of
a device with Envirolink agrees with
the CSG-M, it adjusts the detectors
alarm threshold according to the data
stored. The first adjustment occurs
after 100 hours of data accumulation.
In the case of power cycling or reset-
ting, adjustments begin within 90
seconds.
Alarm
Threshold Voltage
Analog Voltage
0 Volts
SENSITIVITY
VOLTAGE
INTELLIGENT ENVIRONMENTAL COMPENSATION (IEC)
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