SIGMA A-SI Extinguishant Status & Ancilliary Units UL/FM Approved

The Sigma A-Si range of status indicators provides detailed status information
for Sigma A-XT releasing control equipment.

All models provide high brightness, LED indication of Manual Only, Automatic
and Manual, Abort Operated, Disabled, Imminent and Released conditions.
Models are also available with zonal fire indicators and a common trouble
indicator.

For systems where local control of the Automatic/Manual mode and or a
Manual extinguishant release control are required, units are available with
these controls fitted. All models have supervised inputs for the remote
connection of Automatic/Manual mode and abort switches.
All units contain a large, LED display that shows a countdown of the time
remaining until release in seconds.

Up to seven Sigma A-SI status units can be connected to the Sigma A-XT
serial bus and require just two cores for data and two cores for power. Once
connected, status units are supervised, and the Sigma A-XT control panel will
indicate a trouble condition should any unit become disconnected.