Emerson MAN -0016-00, UVC120 manual Appendix D Common Ultra-Violet Absorbing Gases

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Appendix D Common Ultra-Violet Absorbing Gases

Since the UVC120 fire detector is 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 between the detector and the sources of potential fires. Small concentrations of these types of gases may not absorb enough UV radiation to cause a problem, but when higher concentrations of these gases are present the detectors may become blind as not enough ultra-violet radiation can reach them to activate an alarm. Moving detectors closer to the probable source of fire and increasing the sensitivity of the detector can help to overcome this problem in some cases. Following is a list of common UV absorbing gases:

Acetaldehyde

Methyl Methacrylate

Acetone

Alpha-Methylstyrene

Acrylonitrile

Naphthalene

Ethyl Acrylate

Nitroethane

Methyl Acrylate

Nitrobenzene

Ethanol

Nitromethane

Ammonia

1-Nitropropane

Aniline

2-Nitropropane

Benzene

2-Pentanone

1,3 Butadiene

Phenol

2-Butanone

Phenyl Clycide Ether

Butylamine

Pyridine

Chlorobenzene

Hydrogen Sulfide

1-Chloro-1-Nitropropane

Styrene

Chloroprene

Tetrachloroethylene

Cumene

Toluene

Cyclopentadiene

Trichloroethylene

O-Dichlorobenzene

Vinyl Toluene

P-Dichlorobenzene

Xylene

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Contents Ultraviolet Fire Detection System Page Page Page Table of Contents Unit V Maintenance Unit I General Information Detector Specifications Dimensions Basic Operation Controller Controller Faceplate Description Outputs Relay OutputsCurrent Outputs External Reset Automatic Diagnostics and Fault IdentificationProgramming Options System Application Unit II UV Fire DetectionDetector Petroleum Products HandlingDetector Sensitivity Spectral Sensitivity Range Gaseous Fuel HandlingOther Processes Cone of Vision System SensitivityUnit III System Installation Installation General Wiring RequirementsController Wiring Page W iring for U1F-UV with Non-Isolated Current Output W iring for U1F-UV with Isolated Current Output W iring for U2F-UV with Non-Isolated Output W iring Diagram for U2F-UV with Isolated Current Output W iring for U4F-UV with Non-Isolated Current Output W iring for U4F-UV with Isolated Current Output DIP Switch Settings Position and Density of DetectorsMounting the Detector U1F, U2F and U4F Controller Sensitivity AdjustmentChannel Selection U2F and U4FRelay Outputs LATCHING/NON-LATCHING Relay Outputs ENERGIZED/DE-ENERGIZEDExample Page Time Delay for Area Alarms Relay SettingsStartup Procedure Checkout ProcedureUnit IV System Operation Manual Check Procedure Alternate Test Procedure Normal Operation Fire ResponseCurrent Output Situation Main Menu Error Check Mode Err Chc Special Function MenuCurrent Calibration Mode CuC Troubleshooting Unit V MaintenanceRoutine Maintenance Device Repair and ReturnPage Appendices B lis h ed in Accordance with E1A Standard Appendix B Procedure For Activating Reed Switches Appendix C Record Of Dip Switch Settings Appendix D Common Ultra-Violet Absorbing Gases Appendix E Wire Resistance In Ohms AWG #20 AWG #18 AWG #16 AWG #14 AWG #12 AWG #10 AWG #8

0016-00, UVC120, MAN -0016-00 specifications

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