Free Air Calibration for NTK sensor?

["Chris Bennight" <Christopher_Bennight@baylor.edu>]

     I looked through the archives for all the old EGOR information, 
and the only bits I could discern was:

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. I measured 6.3 mA 
@0.445V, and he (Frank) gets 6.0 mA @ 0.428V. Before you think them 
stoich voltages are somewhat different, lemme tell ya that we discovered 
there's a real black-hole steep Ip null right at stoich, just like that 
cliff-edge part of the conventional Lambda curve. The voltage of the 
measurement cell, VsCell, goes along niceNlinearly heading for stoich, 
as you crank up the O2 cell current, IpCell, but just as you get to 
0.450V, all hell breaks loose, and even a tiny lil tweak of IpCell, and 
you're on the other side of stoich by 200-400mV. So what I'm saying is 
that Frank's instrument's feedback loop locks stoich up at 0.428V, and 
mine at 0.445V"

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     So it sounds like stoichiometric is the same voltage bias as you get from
a free air reading?   What is the reasoning behind this?   Or am I missing
something really basic here?

   Thanks,
   Chris Bennight
    Christopher_Bennight@Baylor.edu

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