120-18 January, 2016
Model F120 UV/IR Flame Detector
Sunrise and Sunset
In outdoor applications, orient the ame detector so that it is pointing directly in a north facing
or south facing direction. This will insure that the detector will never see the sun as it rises
above the horizon or sets below the horizon. The sun of course is a very intense ame with
intense amounts of radiation. As the sun rises or sets, the amount of radiation is modulated
by the air currents through which it passes, resulting in a slight “icker” of the radiation sensed
by the ame detector. This can result in a false alarm at sunrise or sunset, particularly if the
detector is oriented in an east facing or west facing direction. If the detector must be located
with this orientation, you must point the detector downward at a large enough angle to insure
that the horizon is not within the eld of view of the detector. You can utilize a sunshade to
limit the eld of view of the detector.
Electromagnetic Interference
The UV sensor can detect other sources of electromagnetic interference such as arc welding,
X-rays, reected sunlight, industrial lighting, etc., and users should be aware of the possible
presence of such radiation when determining a location for the detector. Increase the
declination of the detector to limit the eld of view of the detector to the area that requires
monitoring. If necessary utilize a sunshade. It is important to note that UV sensors can detect
arc welding up to 2 to 3 miles away. The bigger the area that the detectors sees, the higher
chance it will see these other sources of radiation.
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