O2 Volts

[Shannen Durphey]

rr wrote:
> 
> >> Bruce Wrote:
> 
> >>(Some stuff about o2 sensor response's {rr})
> 
> Ok, back from the garage, I think you may be on to something
> here.
> 
> I put a realsquash heated Bosch o2 sensor, tip down, clamped to
> the inside of a small can. With the tip below the rim, and the
> body above. Covered at rim height with plastic sheet (yes it
> was melting to the sensor)
> 
> Hooked up twelve volts to the heater, fluke on the output.
> 
> Nominal volts: ~-40mv in free air, returned to this
> after each test by fanning above can with piece of paper.
> 
> 
> Response's to different gases:
> 
>         propane: rapid and long lasting, > 850mv.
>         R12: light response, quick to return to nominal, ~475mv.
>         acetylene: rapid and long lasted, > 750mv.
>         hold breath, breath through tube into can: no effect...
>         argon: light response, very short lived: ~70mv.
>         contact cleaner: medium response, ~650mv.
>                 (tricloroethane + diclorodifluoromethane)
> 
>         (couldn't find any butane)
> 
> Thinking about this, it makes sense. Once you reach stoich (450mv),
> how can you go higher? Only if the excess hc takes it there...
> 
> The argon response, or lack thereof, is interesting.
You didn't report on the duration of the gas "shot".  Not sure it
matters, but I would have left whatever gas "running" for a fixed
amount of time in the can.  Or better yet, continously until end of
test.  Methinks I may have been motivated enough to do my own
experiments.
Shannen