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 Hydrogen Sulfide

Gas Name: Hydrogen Sulfide          Chemical Formula: H2S          Synonyms: Sewer Gas; Sour Gas

Product Uses/Sources/Applications

Hydrogen sulfide is created during the decomposition process and occurs naturally in natural gas.  Gas detection equipment or gas sensors should therefore be deployed in:


     Short Term (10-minute TWA
     Long-term (8-hr TWA)
20 ppm
10 ppm
     Lower Explosive Limit (LEL):  4.3% by volume

NIOSH Pocket Guide                                                            Click here for link 

Physical Properties

Appearance and Odour colorless with an offensive ordor described as that of rotten eggs. 
Relative density (air = 1.0) 1.188

Armstrong Monitoring Recommends

Sensor Type: Electrochemical Diffusion Type
Standard range: 0-25, 0-50 or 0-100 ppm
Standard trip points: 10 ppm, 20 ppm
Recommended sensor mounting height: 18 inches AFF.

* The exposure limits referenced are based on various listings including those of the Ontario Ministry of Labour and the US National Institute of Occupational Safety Health (NIOSH). Please refer to your local regulations for the limits in your area.


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Ottawa, Ontario
K2E 7K3

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