[Fot] EGT Probes?

[Gary Schneider]

As you likely know a thermocouple is just two dissimilar-metal wires welded
together at the tip. They are made tiny for quick thermal response and not
much can survive 1400 degrees of corrosive gases for extended periods. I'd
guess the tips corrode and go open or resistive. If you give me a failed one
sometime I'd be interested in taking it apart and making some comparative
measurements. I believe the EGTs are all Type K and I can compare to
temperature references we have at work for calibration. We have microscopes
with cameras too.


Gary



>________________________________
> From: "Barr,
Scott" <sbarr at McCarty-Law.com>
>To: 'Tony Drews' <tony at tonydrews.com>; FOT
<fot at autox.team.net> 
>Sent: Monday, August 18, 2014 3:38 PM
>Subject: Re:
[Fot] EGT Probes?
> 
>
>That's what I've been thinking.  Do the probes foul,
or do the wires just
>break?   I've been told the wires are a little fragile.
>
>Scott B.
>
>-----Original Message-----
>From: Tony Drews
[mailto:tony at tonydrews.com]
>Sent: Monday, August 18, 2014 3:37 PM
>To: Barr,
Scott; FOT
>Subject: Re: [Fot] EGT Probes?
>
>Yes, that's the normal failure
mechanism for the EGT gauge.  I'm on my 2nd set
>of probes.
>
>Tony Drews
>
>At 03:26 PM 8/18/2014, Barr, Scott wrote:
>>So if my EGT stops working or
works only intermittently, is it likely
>>that I need new probes? (I did check
to see that the connections are
>>still...connected)  The tailpipe color looks
good (a nice dove grey),
>>but I'm getting no reading on one side of the gauge
and a low reading
>>on the other side.
>>
>>Scott B.
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