Honeywell Experion MX Operator's Manual page 27

Table 4 summarizes nuclear and X-ray radiation hazards, warnings, and safety precautions
to be used in systems with a nuclear- or X-ray-based sensor (radiation hazard zone < 1 m
(3.28 ft) from heads).
Table. 4.
Hazard Type Warning
Green indicator OFF Indicates that a radiation shutter switch is open.
Red indicator ON Indicates radiation shutter commanded open.
Work in this area < 1 m (3.28 ft) from head exposes the
worker to trace amounts of radiation from sensors
while heads are aligned.
Green indicator ON Indicates that all shutters are closed.
Red indicator OFF Indicates radiation shutter commanded closed.
No nuclear radiation exposure hazard.
Green indicator ON Indicates all shutters are closed.
Red indicator ON Indicates a shutter open command is active.
Not a normal operating mode when persistent. May
occur briefly during shutter open sequence, or if a
shutter cannot open, for example, due to lack of air
pressure.
If red is ON, operator must always assume radiation
and act accordingly.
Green indicator OFF Indicates shutter may be open.
Red indicator OFF Indicates no active shutter open command.
Not a normal operating mode. May occur if a shutter is
stuck open, power is off, or if green light circuit is not
functioning properly. Nuclear radiation exposure
hazard may be present.
2.2.3.2 Laser Radiation
Laser radiation-based sensors do not use a shutter for emissions control; they are not
related to the red and green shutter safety indicators on the head or user panels.
Nuclear and X-ray Radiation Hazard Precautions
6510020335
SCANNER SAFETY AND LOCAL CONTROLS
Safety Precautions
Work in this area < 1 m (3.28 ft) from
head requires closure of all shutters
first. Do not look into or insert body
parts into gap.
Normal maintenance work may be
done on scanner, head and sensors in
this area. Highest level of safety
control when
Interlock key is removed by person
doing maintenance work.
No nuclear radiation exposure
hazard. Troubleshoot radiation
warning system if state is persistent.
Assume nuclear radiation exposure
hazard may be present. Do not split
heads. Troubleshoot radiation
warning system.
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