O2 voltz

[David A. Cooley]

At 04:02 PM 5/15/99 -0400, you 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?.

Bad thing about O2 sensors is they aren't truly O2 sensors... they are HC
sensors.
In pure O2, the sensor should keep a low voltage.  In an environment rich
with HC (IE propane, unburnt fuel etc) they should go .9-1 Volt.
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           David Cooley N5XMT           Internet: N5XMT at bellsouth.net
     Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R. Member #7068
   Sponges grow in the ocean... Wonder how deep it would be if they didn't?!
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