O2 voltz
Bill the arcstarter
arcstarter at hotmail.com
Sun May 16 02:12:19 GMT 1999
Various people wrote:
>> 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.
I can confirm this. My "O2" sensor could NOT distinguish between air and
100% argon (from a TIG welder). However it responded gloriously to a bit of
raw propane from the plumber's torch...
(The O2 sensor was a 3-wire electrically heated Bosch unit)
There is indeed a great mystery here as there is obviously much more to the
story than "They sense O2". ('cause they don't!)
If anyone knows the whole story I'd love to hear it :)
-Bill
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