More DIY EGOR

[RDwoo10 at aol.com]

from this data that looks to be more of a hassle than it is worth.  the res 
VS Temp is rather linear & more importantly predictable  as long as this is 
true up to the high temps (as you pointed out) that the sensor is likely to 
run then i would say it is probably OK.  i would think the more important 
issue here would be stability than abs temp.  if the heater is maintaining 
the sensor @ some temp it has to be higher than the operating range (or 
likely operating range) of the exh gasses.  if this is true then what the 
temp is, is not important.  the down side to this has to be, how long is the 
heater going to last?  if the entire magic of the sensor is the temperature 
compensation, not sure here but this appears to be true, then the feedback on 
the temp controller w/the heater current ought to be sufficient.  

I have been wading through the archives but have not come on any of the 
specific information about the sensor in question.  from what i gather the 
issue here is the non-linearity of the sensor & the majority of that is the 
temp of the sensor (& somewhat pressure, but don't know.  input Bruce?).  
keep that stabile & the output is rather linear.  

i would imagine that for safety sake, the O2 sensor temp ought to be roughly 
10% higher than the temp that the sensor would be w/o the heater.  i can only 
imagine that the best case/worst case would be non-thermally coated long tube 
headers & the other side of that would be cast iron manifolds w/the sensor 
right in the manifold (AKA Toyota etc.).  

thanks for the mental challenge.  this is turning out to be good for the 
pumpkin.

Bob Wooten
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