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5.1.3
Alarm Conditions
Alarm conditions are determined by the system continually polling the analog devices and
comparing the reported value against stored thresholds for pre-alarm and alarm conditions. An
agency approved range of thresholds is provided for each type of analog device (except for
contact devices).
Devices can be individually configured with 2 separate thresholds, “day time” and one “night
time” or after hours operation; i.e. a device may be configured to a low sensitivity for “day time”
and high sensitivity at “night time”. The day time threshold will be used unless the after hours
operation is active. To configure threshold settings, Enable Auto After Hours must be selected
in the Configurator.
Figure 12 FX-3500 Configurator Date and Time Settings
The panel can provide up to 280mA of current to the devices on the loop at normal standby.
For device currents see Appendix E - Battery Calculations on page 94.
For further information refer to the device Installation Instructions and other documentation
provided with the addressable devices, bases, and isolators.
5.1.4
Drift Compensation
Drift Compensation is built into AP devices and CLIP devices Models MIX-2251TMB and MIX-
7251B, and is not performed by the panel. Drift Compensation is not provided for other CLIP
devices.
Drift compensation automatically adjusts for gradually increasing effects of dust and other
accumulations of dirt in the detectors. It will adjust the thresholds to compensate for a detector
going dirty according to the gradual change in the normal clean air value received. When it can
no longer compensate for an increasingly dirty detector, a dirty detector trouble is indicated for
that device.
5.1.5
Auto Test
Periodically each detector is commanded to return an alarm value to test its ability to alarm. If
the device fails the test, a trouble is indicated on that device. This trouble is latched until
system reset.