F-1
Appendix F
Envirolink is an optional feature that permits
MXL-IQ to compensate automatically 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-IQ stores and analyzes the
analog readings of the smoke detector and
adjusts the detector’s threshold upward or
downward, as necessary, to maintain a
constant sensitivity.
As the analog voltage increases due to
environmental factors, an equivalent
increase in the detector’s alarm threshold
prevents factors other than smoke from
causing an alarm. This method maintains
the selected detector’s sensitivity.
Typically, the analog voltage changes
slowly over long periods of time for environ-
mental 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-IQ control panel
goes through an initial system power-up.
The MXL-IQ does not keep the Envirolink
option where it was formerly applied when
this new system powers up. The Envirolink
memory re-initializes, and then MXL-IQ
begins adjusting the alarm thresholds
wherever Envirolink is selected in the new
CSG-M.
EnEn
EnEn
En
vv
vv
v
irir
irir
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olinkolink
olinkolink
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Adjusting the Alarm Threshold
When a New CSG-M is Uploaded
After MXL-IQ checks that the actual ID of a
device with Envirolink agrees with the
CSG-M, it adjusts the detector’s alarm
threshold according to the data stored. The
first adjustment occurs after 100 hours of
data accumulation. In the case of power
cycling or resetting, adjustments begin
within 90 seconds.
Alarm
Threshold Voltage
Analog Voltage
0 Volts
SENSITIVITY
VOLTAGE
INTELLIGENT ENVIRONMENTAL COMPENSATION (IEC)
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