All indicators use redundant PCB mounted LEDs with feedback to allow confirmation of
proper operation back to the supervisory system for diagnostic alarms.
Indicators on the head are not sensor-specific. The green indicator will be lit only when all
sensor shutters are closed (see Figure 43 and Figure 45).
Fig. 43. Green Shutter Closed Indicator On Head
The red indicator will be lit when any sensor shutter is commanded to open (see Figure 44
and Figure 46).
Fig. 44. Red Shutter Open Indicator On Head
Fig. 45. Green Shutter Closed Indicator On User Panel
To determine which sensor shutter is open, observe the smaller red indicators directly over
the radiation sensor row on the scanner user panel (see Figure 46).
Fig. 46. Red Shutter Open Indicator On User Panel
Amber indicator rings surrounding sensor buttons indicate whether a specific sensor of a
hazard type has been enabled. When the ash sensor, which uses Xrays, is enabled with the
key and button press, power to the X-ray source is turned on. The red indicator above the
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