EGT

[Stephen Dubovsky]

At 01:22 PM 4/1/97 -0600, you wrote:
>Greg, thanks .... I am quite familiar with thermocouples
>and their various applications/weaknesses.  A question
>came up about them and I advised staying away from type
>K (chromel-alumel) as they were at their limit in that
>app and not suited for the hostile environment.  I was
>asked what I recommended (they got me there ;-)  so I
>deferred to you.  From what you're telling me, I deduce
>that they use K-type in a SS sheath (probe).  You have
>confirmed my warning with your statement about the life
>span of these type probes.  I had wondered if there were
>any made with a longer life -- guess not.
>

  Ever thought of putting a thermocouple in in a ceramic thermowell?  The
ceramic should be impervious to anything in the exhaust.  Another thing to
look into would be a ceramic Pt RTD (a thermistor).  These would probably
have a faster time const than a thermowell, but are only good to 700-850 C
I think.  That might be enough...  Look in the Omega book if you want more
info.

Happy probing...
SMD