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Appendix B Common Ultra-Violet Absorbing Gases
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 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
Acetone
Acrylonitrile
Ethyl Acrylate
Methyl Acrylate
Ethanol
Ammonia
Aniline
Benzene
1,3 Butadiene
2-Butanone
Butylamine
Chlorobenzene
1-Chloro-1-Nitropropane
Chloroprene
Cumene
Cyclopentadiene
O-Dichlorobenzene
P-Dichlorobenzene
Methyl Methacrylate
Alpha-Methylstyrene
Naphthalene
Nitroethane
Nitrobenzene
Nitromethane
1-Nitropropane
2-Nitropropane
2-Pentanone
Phenol
Phenyl Clycide Ether
Pyridine
Hydrogen Sulfide
Styrene
Tetrachloroethylene
Toluene
Trichloroethylene
Vinyl Toluene
Xylene