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Artificial nose? Helping industry trace their leaks? MRTG for toxic gas?

Welcome to the wonderful world of post-chemistry.

Sniffing

Carbon Monoxide (CO), Hydrogen (H)
Hydrogen (H), Ethanol (C2H6O), Iso-butane (CH3CH(CH3)2), Carbon Monoxide (CO), Methane (CH4)
Toluene (C7H8), Hydrogen Sulfide (H2S), Ethanol (C2H6O), Ammonia (NH3), Hydrogen (H)
Ethanol (C2H6O), Hydrogen (H), Iso-butane (CH3CH(CH3)2), Carbon Monoxide (CO), Methane (CH4)

Using

Electronic components sensing various gaseous substances : http://www.selectronic.fr/soussousfamille.asp?fam_ref=05&sfam_ref=98&ssfam_ref=32
http://www.nexsens.com/support/user_manuals.htm
http://www.freeduino.org/
http://www.rosiedaniel.com/2007/04/gas-sensors.html
http://itp.nyu.edu/physcomp/sensors/Reports/GasSensors

Proposal

Sensors: cheap sensors made by a company called Figaro - one TGS2600 + one

TGS2602. Available at Radiospares for roughly 30 Euro both (but I had bad experiences with them) and maybe Diltronic (someone should call)

Those sensors are already used by http://fridav.ljudmila.org (that's how we

found them)

Based on a Fonera which could connect to the /tmp/lab wireless network and

directly post results on the internet

Using SPI with Fonera: http://www.larsen-b.com/Article/262.htm
ADC: LTC2496 (I can bring an evaluation kit)
My LTC2496 driver for Linux: http://lekernel.net/ltc2496