Emerson UVU-140A-AR user manual Installation, What’s in the package, Mounting the Detector

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

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