The O2 sensor actually measures the partial presure (amount) of oxygen.
Some also measure temperature i.e they include a thermocouple that gives a
separate measurement. Similar types of sensors are used to monitor
industrial furnaces. It's basically a piece of zirconium oxide with air
(20.9%oxygen) on one side and the exhaust on the other side - usually a tube
with air on the inside. If you have air on both sides the output voltage is
zero. As the amount of free oxygen in the exhaust decreases the output
voltage increases. There is a very abrupt increase from about 100
millivolts to about 1 volt when the excess oxygen just becomes zero - i.e.
stoichiometric ratio, then the voltage continues to increase gradually as
the exhaust becomes richer. If you know the temperature and the output
voltage you can calculate the actual amount of oxygen present. If you don't
know the temperature then all you can find is the stoichiometric point. Try
www.Thermox.com as a source of furnace monitors.
Bill
-----Original Message-----
From: Jim Hoetker <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Friday, April 27, 2001 11:04 PM
Subject: Re: Injector sync and six speeds
>Question... does the O2 sensor actually measure the O2 concentration
>directly or does it measure the EGT and adjust the mixture to get the
>correct temp.
>When flying a piston engine plane, you lean it out untill the EGT stops
>rising and then richen it up a little.
>This is called , being an onboard computer.
>A buddy of mine said the O2 sensor is actually an EGT sensor.
>
>Jim H.
>
>nicholas.threader wrote: nd know
>
>>
>>
>> Since the O2 sensor is the only one that receives the mixture strength .
>
