[Diy_efi] WBO2 and AFR

[Adam Wade]

--- gary <gas- at charter.net> wrote:

> The sensor recognizes only oxygen.  No other aspect
> of the exhaust content is recognized.  They are
> referred to as OXYGEN (and oxygen only) sensors for
> a reason.

I found this little gem with a quick Google search.

<http://chemsens.electrochem.jp/journal/1998b-abt.htm>

Scroll down to "SOLID STATE SENSOR FOR HYDROCARBON
GASES BASED ON MIXED POTENTIAL"

"Non-Nernstian behaviors of a zirconia-based oxygen
sensor for 0-500 ppm saturated and unsaturated
hydrocarbon gases were studied in the presence of 10%
oxygen at 600 C. The sensor using a Pt sensing
electrode could not respond to all the hydrocarbons,
but the sensor using an Au sensing electrode exhbited
large electromotive forces (emfs) for the unsaturated
hydrocarbons which were aliphatic as well as aromatic.
The emf values of the sensor for hydrocarbons were
strongly affected by their unsaturation fraction,
carbon number, and chain structure. Then, the
mechanism of the mixed potential for the hydrocarbons
was also studied by the measurements of the
polarization curves for the two electrodes and their
catalytic activity."

And from 

<http://www.aoi-corp.com/additional_information/oxygen_sensor_types#zirconium_oxide_oxygen_sensors>

"A major limitation of zirconium oxide oxygen sensors
is their unsuitability for trace oxygen measurements
when reducing gases (hydrocarbons of any species,
hydrogen, and carbon monoxide) are present in the
sample gas."

It would seem that Mr. Bowling is correct, and your
above statement is not.

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