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Figure 2 - Detector cone of vision
CHAPTER 2 INSTALLATION
What’s in the package
Remove all the components from the packing box(s) carefully; check components against the packing list. Inspect
all components for obvious damage and broken/loose parts. Notify the carrier and distributor immediately if
damage is found or parts are missing.
Mounting the Detector
There are many factors that you should be aware of when positioning your fire detector(s).
Cone of vision
The UVU-140-A & UVU-140-AR fire detectors have a nominal 120 degree cone of vision when measured in
accordance to NFPA 72 guidelines.
Figure 2
shows the cone of vision and detector response to a UV source at
various distances.
Range
The practical application distance is up to about 80 feet (25 metres). The distance is directly related to the
intensity of the ultraviolet radiation source. Programming the UVU-140-A & UVU-140-AR fire detectors to
require a high count rate results in low system sensitivity.
Environmental Factors
Airborne contamination such as steam , oil mist, ice build up and smoke can impair the detection capabilities of
UV fire detectors and should be avoided.
Since the UVU -140-A & UVU-140-AR fire detectors are designed to detect fires by responding to the ultra-
violet (UV) radiation they emit, it is very important to be aware of UV absorbing gases that may be present
