O2 Volts

[rr]

>> 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.

Dog-gon-it Bruce, I think you already knew this (yes, I'm chuckle'ing
again, as the wife asks 'how the experiments work out'?)

BobR.

P.S. the epa paper discussed how the o2 sensor was responding to
different
gases, but there was something hockey about the experiments they were
running, but I can't remember what it was.

Maybe has to due with the gases they used not being found in an exhaust
stream, like the r12 I tried? Can't remember.

Gonna' read those sae papers next.

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