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

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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

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Contents UVU-140A and UVU-140-AR Unitized Ultraviolet Fire Detector Page Table of Contents Page Features Technical InformationIntroduction Spectral Sensitivity RangeSpecifications Operating Voltage Range 24Vdc nominal 10.5 to 32VdcApplications Response TimeMounting the Detector InstallationWhat’s in the package False Alarms Position and Density of DetectorsDetector with Swivel Mount Swivel Mount General Wiring Requirements Wiring Diagram for UVU-140-A If the 4-20 mA signal is System Sensitivity Detector SettingsCoil and Relay Settings Start up Procedure Check Out ProcedureStart UP and Test Automatic vi TestTest Procedures Manual Check ProcedureManual vi Test Procedure Normal Operation Normal OperationFire Condition Current & Relay Output ConditionsMaintenance Routine MaintenanceTroubleshooting Cleaning Viewing Window and ReflectorDevice Repair and Return B lis h ed in Accordance with E1A standard Appendix B Common Ultra-Violet Absorbing Gases Appendix C Wire Resistance In Ohms
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