SIGMA AM-255 - Manual (Page 12)

3. OPERATING INSTRUCTIONS page 9
Model AM-255
3. OPERATING INSTRUCTIONS
3.1. CONTROLS AND INDICATORS
The controls and indicators can be made to operate in several different ways. How they operate
is controlled by the software installed.
The front panel contains the power LED, ready LED, alarm indicator LEDs, and the
acknowledge switch. The power LED is on whenever the system has power. The ready LED
shows that the system is clear of alarms and working properly. The alarm indicator LEDs blink
when enabled, and indicate the following conditions:
Tamper:
Amber lamp indicates either a fault in the cable between the AM-255 and the
portal monitor, or the tamper switch(s) in the pillar are activated. The tamper
indication is also used to indicate a low battery condition when the AM-255 is
used with TSA’s Personnel/Vehicle Monitors.
High Background Alarm:
When the radiation level exceeds the high alarm level that has been programmed
into the system, the high background alarm is indicated.
Radiation Alarm:
When the system detects that the radiation level has exceeded the alarm threshold
while the portal is occupied, the red radiation alarm lamp will illuminate and the
audible alarm will sound.
Low Background Alarm:
The low background alarm indicates that the background counts are below the
low background setting in the system. This could be caused by a detector failure
or by shielding the pillar.