How to measure H2S in landfill gas > 30.000 ppm

[knutwiik]

I am working on a project with a landfill gas having more than 30.000 ppm H2S as measured by GC. I would like to log concentrations continuously over some time (a couple of months).

Bearing in mind that the gas is ATEX zone 0 and installation will be in an ATEX zone 1 area;

Any suggestions on where to find sensors / sampling pumps or sampling systems?

Cheers,
Knut
purenviro.com

 

[StoneCold]

If you have 3% H2S is the gas even worth looking at?
Anyway how I would handle it if I need samples continuously was I would use a GC in a non haz area and pipe the gas over to it in a very small line. You need good venilation and probably an H2S monitor in the area if you are going to have people around.

Regards
StoneCold

 

[dcasto]

The cheap easy way is to do spot sampling

http://www.buydraegertubes.com/hydrogensulfide02a-1.aspx

Or here is an expensive version

[PDF] Tail Gas Analyzer

http://www.a-a-inc.com/.../AAI_Product_Bulletin-TLG-837_Tail_Gas_Analyzer_

...File Format: PDF/Adobe Acrobat
tions of H2S and SO2 in the Claus process stream, computing the control ... solid state diode array detector. • synchronous monitoring of H2S, SO2, COS, CS2 ... unit is used to absorb H2S from fossil fuels. The Claus process is the ...

 

[maddocks]

I know it sounds hokey, but we've used big garbage bags to sample real low pressure gasses. Collect and then either do a tedlar bag and onsite analysis or do onsite Draegers. I've never had much luck with Draegers being accurate though.