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:
Gas | Formula | DENSITY OF AIR = 1 | LEL % | Ex | Tox | HTP 8h | HTP 15min |
---|---|---|---|---|---|---|---|
Ammonia | NH3 | 0,59 | 16 | X | X | 20 | 50 |
Acetone | C3H6O | 2,01 | 2,2 | X | X | 500 | 630 |
Acetylene | C2H2 | 0,9 | 2,4 | X | -- | -- | -- |
Benzene | C6H6 | 2,7 | 1,3 | X | X | -- | -- |
Ethanol | C2H6O | 1,59 | 3,3 | X | X | 1000 | 3000 |
Ethylene | C2H4 | 0,97 | 2,4 | X | X | 200 | -- |
Ethylene oxide | C2H4O | 1,52 | 2,7 | X | X | 1 | -- |
Phosphine | PH3 | 1,17 | 1,8 | X | X | 0,1 | 0,2 |
Phosgene | COCl2 | 3,42 | -- | -- | X | 0,02 | 0,05 |
Oxygen | O2 | 1,1 | -- | -- | -- | -- | -- |
Carbon dioxide | CO2 | 1,52 | -- | -- | X | 5000 | -- |
Carbon monoxide | CO | 0,97 | 12,5 | X | X | 20 | 75 |
Chlorine | Cl2 | 2,45 | -- | -- | X | -- | 0,5 |
Chlorine dioxide | ClO2 | 2,33 | 10 | X | X | 0,1 | 0,3 |
Hydrochloric | HCl | 1,26 | -- | -- | X | -- | 5 |
Xylene | C8H10 | 3,67 | 1 | X | X | 50 | 100 |
Methane (natural gas) | CH4 | 0,55 | 4,4 | X | X | 1000 | -- |
Methanol | CH4O | 1,11 | 5,5 | X | X | 200 | 250 |
n-Butane | C4H10 | 2,01 | 1,5 | X | X | 800 | 1000 |
n-Hexane | C6H14 | 2,98 | 1,1 | X | X | 20 | -- |
n-Heptane | C7H16 | 3,46 | 1,1 | X | X | 300 | 500 |
n-Pentane | C5H12 | 2,49 | 1,1 | X | X | 500 | 630 |
Ozone | O3 | 1,66 | -- | -- | X | 0,05 | 0,2 |
Propane | C3H8 | 1,52 | 2,2 | X | X | 800 | 1100 |
Sulphur dioxide | SO2 | 2,21 | -- | -- | X | 0,5 | 1 |
Hydrogen sulphide | H2S | 1,18 | 4,3 | X | X | 5 | 10 |
Styrene | C8H8 | 3,6 | 1,1 | X | X | 20 | 100 |
Hydrogen cyanide | HCN | 0,7 | 5,6 | X | X | 0,9 | 4,5 |
Toluene (solvents) | C7H8 | 3,18 | 1,2 | X | X | 25 | 100 |
Nitrogen | N2 | 0,97 | -- | -- | -- | -- | -- |
Nitrogen dioxide | NO2 | 1,59 | -- | -- | X | 0,5 | 1 |
Nitric oxide | NO | 1,04 | -- | -- | X | 2 | -- |
Hydrogen | H2 | 0,07 | 4 | X | -- | -- | -- |