O2 voltz

Bruce Plecan nacelp at bright.net
Sun May 16 02:55:05 GMT 1999


----- Original Message -----
From: Steve Gorkowski <kb4mxo at mwt.net>
To: <diy_efi at efi332.eng.ohio-state.edu>
Sent: Saturday, May 15, 1999 9:39 PM
Subject: Re: O2 voltz


> Hi Bruce
> Are you using the computer scope probe ?

Yes

> With a one wire o2 sensor or Ngk i can
> read full one volt with no loading with same probe. How are you heating
it.

No, I'm using a 4 wire GM divourced ground O2 sensor.  12v 1.8 ohm sensor
resistor
Bruce
>
> Steve
>
> Shannen Durphey wrote:
>
> > Bruce Plecan wrote:
> > >
> > > For the lack of anything else to do, I hooked the heated O2 up, and
was
> > > looking at the voltage drop across a sensor resistor, I been thinking
of
> > > using.
> > >   As the heater warmed up, the voltage drop across the resistor
changed,
> > > just meaning the heater was drawing less current.
> > >   I had hooked the scope probe across the O2, and cold there was no
output,
> > > to be expected, but as it warmed up the output swung toward, .2v.
Just in
> > > atmospheric conditions.  Ok, so then it should go way high in pure O2
right,
> > > nope went a little over .3, and stopped there.
> > >   Did I need to load the sensor?.
> > >   The heater doesn't go to a high enough temperature for the O2 to
fully
> > > swing high?.
> > >   Does the engine side need to see a slight amount of pressure to
reference
> > > to?.
> > > Grumpy
> > I thought sensor voltage increased as O2 content on element side of
> > sensor decreased.  I suspect if the O2 concentration on the Ref side
> > of the sensor was increased the voltage would rise some.
> >
> > Not everyone can duplicate the O2 portions of your experiments at
> > home. ; )
> > Shannen
>
>
>




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