Gas List

Below is a list of the most common gases that require monitoring and their risk factors (Ex = Explosive gas, Tox = Toxic gas). A suitable sensor for controlling each gas can also be found in the list. Download the gas list in PDF format here: Gas list and HTP value publications. HTP values: HTP values:

GasFormulaDENSITY OF AIR = 1LEL %ExToxHTP 8hHTP 15min
AmmoniaNH30,5916XX2050
AcetoneC3H6O2,012,2XX500630
AcetyleneC2H20,92,4X------
BenzeneC6H62,71,3XX----
EthanolC2H6O1,593,3XX10003000
EthyleneC2H40,972,4XX200--
Ethylene oxideC2H4O1,522,7XX1--
PhosphinePH31,171,8XX0,10,2
PhosgeneCOCl23,42----X0,020,05
OxygenO21,1----------
Carbon dioxideCO21,52----X5000--
Carbon monoxideCO0,9712,5XX2075
ChlorineCl22,45----X--0,5
Chlorine dioxideClO22,3310XX0,10,3
HydrochloricHCl1,26----X--5
XyleneC8H103,671XX50100
Methane (natural gas)CH40,554,4XX1000--
MethanolCH4O1,115,5XX200250
n-ButaneC4H102,011,5XX8001000
n-HexaneC6H142,981,1XX20--
n-HeptaneC7H163,461,1XX300500
n-PentaneC5H122,491,1XX500630
OzoneO31,66----X0,050,2
PropaneC3H81,522,2XX8001100
Sulphur dioxideSO22,21----X0,51
Hydrogen sulphideH2S1,184,3XX510
StyreneC8H83,61,1XX20100
Hydrogen cyanideHCN0,75,6XX0,94,5
Toluene (solvents)C7H83,181,2XX25100
NitrogenN20,97----------
Nitrogen dioxideNO21,59----X0,51
Nitric oxideNO1,04----X2--
HydrogenH20,074X------