H2s sensor

[panelman]

Hi folks

I need a H2S sensor that will work in the absence of oxygen.

Our gas is 80% Nitrogen, 20% methane 25 ppm H2S,

Ideally what I want is something with a 1-5V/4-20mA output that covers the range 0-30 ppm.

Everything I've found so far either only works with H2S as a trace in air as they need oxygen or is ridiculously cross sensitive to methane

Any pointers appreciated

Thanks

 

[DRWeig]

Gas chromatograph? There are some online versions with analog outputs...

Best to you,

Goober Dave

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[panelman]

yep, I've briefly looked at GC, assorted laser/UV and the lead tape systems but, as always, the cost (20k per system) is in danger of scaring the client away.

The sensors used in personal gas monitors (cost c. £/$100) is really what we want, we just need to find one that will work sans oxygen

 

[DRWeig]

1) Do the personal gas monitors you've evaluated have a doped metal oxide (Figaro) sensor or an electrochemical type? Have you discovered that both types need oxygen in the sample?

2) I don't know of a maker, but non-dispersive infrared could be a possibility?

Best to you,

Goober Dave

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[dcasto]

I assume this is a process monitor, lead acetate based monitors are the best thing since sliced bread



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