WB 02 op. temp.

[Brian L Massey]

On Fri, 9 Nov 2001 23:15:19 -0700 "Diehl, Jeffrey" <jdiehl at sandia.gov>
writes:
> I've been reading up on some of the WB 02 projects and I've come up 
> with a question.
> 
> I've reading that the max operating temp is 800C.  I'm not sure why, 
> but I
> was expecting exhaust gases to be hotter than that.  What are some 
> real-life numbers?

Did you miss the review of the NTK SAE article I posted just two days
ago?, in which I quoted that article (SAE #920234) as saying:
        "The usable range of the element temperature is from 700C to
950C."

The site you mention in your post is based on mere speculation, it is
best to read the tech literature from the mfgs themselves; the compiler
of that page doesn't have anything working, nor has he apparently read
the above NTK article; at least it isn't cited in the list of references.
Most of what is posted there is taken from public Bosch literature. The
Bosch LSU appears to have a working upper limit of 850C (judging from the
LSU datasheet uploaded to incoming by BertB & JorgenK), but this is not
the spec for the NTK sensor. Nobody within the DIY community has
demonstrated or claimed to have built any working hardware for the LSU,
either. Note that the circuit posted on the page you cite is clearly
stated to be a 'paper tiger', and not an actual working circuit.

900C IIRC is at the high end of EGTs even for boosted recip engines. And
just a short distance down the pipe the gases have cooled significantly.
These sensors don't ever seem to get placed immediately after the exhaust
valves anyway; no need to. On rotary engines, perhaps you might want to
use EGT probes to pick a suitable place downstream that is sure to keep
within the sensor's upper limit.

HTH,
Brian
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