1.3.3.1
High humidity within the
sealed case assembly. This will occur if
the plastics or the case seal are
damaged and allowing moisture into
the camera.
1.3.3.2
Failure of the lens iris assembly
This warning symbol may appear
briefly during normal operation, but
the camera must be returned to an
authorised service centre or the factory
if the warning symbol remains on.
Failure to act upon this level of
warning may result in serious
damage to the system and may
invalidate the warranty.
1.4
OPERATING NOTES
1.4.1
Interpreting The Image -
Relative Temperatures
The image displayed is simply a black
and white picture of the infra red
energy entering the lens. The camera
displays relative temperature
differences between individual objects
and their surroundings irrespective of
overall ambient temperature.
The camera is set up to display objects
at various shades between black for
cooler items to white for hotter
bodies, i.e. in a room at 20
8
C a cold
drink would appear black whilst a hot
radiator would appear white. In a
room at 250
8
C, however, it is possible
that the same hot radiator may appear
darker than for example, burning
materials.
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