Haven't been following this closely, but chimneys have caught fire due 
to creosote buildup, and houses have burnt down as a result. I would 
think,one would want to detect over temperature and send alarm. Have 
seeen pictures with flame shooting (pretty ferocious draft) several feet 
out of chimney.

Jinx wrote:
>> The sensor has to tolerate worst case about 1000 degrees Celcius
>> Bye Bye LM35 I think.
> 
> Hmmm, yes, the LM35 is probably unsuitable in that case. I didn't
> think you'd be measuring so close to the fire
> 
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