The company I work for sells the equipement for doing the emission tests
here in Ontario, Canada. The gas analysis is done by passing a sample thru a
tube with an infra red light source at one end and a detector at the other
end. The critical part is the filter windows in between. CO2 absorbes a
particular wave length of light, as does HC and CO. Nox and O2 are measured
with a chemical reaction sensors separate from the other gases.


> >I'm not sure what Alan is after though.
>
> In the UK to pass the annual vehicle check a gas analysis is done for CO2
> content etc. It would be nice to do this at home and see how bad it is
before
> committing to the proper check. I do not know if the sensors used are
generally
> available.
>
> --
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>
>

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