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   Updated: 5 Mar 2018
 

 

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GAS DETECTION - PHYSICAL DATA

 

   
  Gas substance Chemical formula Density
air = 1
TLV in USA

TWA

Explosion limit, LEL 20° C/
1013 mbar
 
  Ammonia NH3 0.59 25 ppm 15
  Argon Ar 1.38 - -
  n-Butane C4H10 2.09 - 2
  Ethanol C2H5OH   1000 ppm 3.3
  Helium He 0.14 - -
  Chlorine Cl2 2.49 0.5 ppm -
  Carbon dioxide CO2 1.53 5000 ppm -
  Carbon monoxide CO 0.97 35 ppm 12.5
  Nitrogen N2   - -
  Nitrogen Monoxide NO 1,04 25 ppm -
  Nitrogen dioxide NO2 2.75 2 ppm -
  Methane CH4 0.55 - 5.0
  Propan C3H8 1.56 - 2.2
  Sulphur dioxide SO2 2.26 2 ppm -
  Hydrogen Sulphide H2S 1.19 10 ppm 4.0
  Oxygen O2 1.0 - -
   

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