EGT sensor life

[xxalexx at ix.netcom.com]

> From:          cmorris at ix.netcom.com (Charles)
> To:            diy_efi at esl.eng.ohio-state.edu
> Subject:       Re: EGT sensor life
> Date:          Thu, 12 Mar 1998 23:23:04 GMT
> Reply-to:      diy_efi at efi332.eng.ohio-state.edu

> On Thu, 12 Mar 1998 14:15:40 -0500, you wrote:
> 
> >>How many hours do the egt sensors last?
> >
> >Golly, good question. I don't recall ever hearing of someone replacing
> >one "routinely" as a consumable. They go bad every now and then, of
> >course. 
> 
> 	I have a thermocouple in the exhaust manifold of my BMW 745i,
> upstream of the turbo. It's a 1/8" diameter stainless probe for quick
> response times. They only seem to last about 40 hours though (the
> sealed end burns right off). Temps are usually around 1200 F at
> cruise, and as high as 1650 F with 15 psi boost. I've tried 321
> stainless and Inconel, both give up eventually. At $40 apiece from
> Omega Engineering, this is an expensive hobby...
> -Charles
> 
Try a alumina protection tube, I have used these in CVD furnance at 
1400 C. fill with helium to improve response. 
call omega engineering, they will give free engineering support.
alex