Net Safety UV/IRS-H2-A, User Manual

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Net Safety Monitoring
MAN-0101 Rev 01 UVIRS-H2-A/H2-AR & UVIRS-H2-A-X/H2-AR-X 22
November 23, 2012
A
PPENDIX
A: C
OMMON
UV A
BSORBING
G
ASES
Since the UV/IRS-H2-A & UV/IRS-H2-AR fire detectors are designed to detect Hydrogen based fires by responding to the ultra-violet (UV) and Infrared (IR)
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