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rigging a thermocouple on a certified plane

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Sep 02, 2009 9:20 am Post subject: rigging a thermocouple on a certified plane

At 11:10 AM 9/2/2009, you wrote:

 	  Quote: 	
		  

<bbradburry(at)bellsouth.net>



  My son owns a Mooney.  He can not lean it past about 50-100 degrees rich of

peak with out it starting to miss.  He is burning about 12 Gal/Hr at cruise

when I think he should be able to get to about 10.  He could benefit from

some type of injector balancing like from GAMI.  Problem is he doesn't have

the necessary EGT probes to get the information for each cylinder and

installing a certified rig to do this would be too expensive.

My thought is that he could clamp probes to the outside of the exhaust

manifold tubes for each cylinder and run them to a reader head in the

cockpit to get "close enough" information for this application.  I have

thermocouple wire and could make the probes.  Where could he come upon an

inexpensive reader head for thermocouples.


	


   One of my favorite sources of converting various phenomena

   into recorded or displayed data is Weeder Technologies.



http://www.weedtech.com/



   They offer a 4-channel thermocouple signal conditioner

   that you can read on the USB port of a laptop. Check out

   the WTTCI thermocouple module for $109. They even offer

   software at no charge that will let you display, record,

   and/or graph the data.



 	  Quote: 	
		  What is the community take on this?  Would it work? Is it legal if it is not

permanently attached to the plane?


	


   It's not possible to achieve necessary precision

   for balancing individual cylinder performance

   without extending a REAL EGT probe into the

   gas stream for the cylinder of interest. Now,

   this only requires one small hole through which

   you can install the standard type K EGT probe.



   This is largely between you and your AI at the

   next annual . . . how's the "approved" way to

   plug 3 holes that you're not using any more.

   Do you have a single probe EGT installed now?

   I would think you could install 3 additional

   EGT probes for the purpose of switching them

   to a single instrument. The fact that you

   used the extra probes for some investigative

   activity in the past . . . or have even abandoned

   the switch in favor of the single display

   but left three probes in place to "plug the

   holes" shouldn't be a hard sell either.



   In any case, the probes need to get into the

   approximate center of gas flow in the pipe.

        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Sep 02, 2009 11:39 am Post subject: rigging a thermocouple on a certified plane

At 12:07 PM 9/2/2009, you wrote:

 	  Quote: 	
		  



Here's a dedicated K-type meter:



http://www.virtualvillage.com/digital-thermometer-for-k-type-thermocouples/sku003920-016



If the above wraps, try this:



http://tinyurl.com/kloqam


	


   Yeah, that works too. You can rig a 2-pole, 4-position

   rotary switch to "scan" the 4 probes for comparison.

   See:



http://www.aeroelectric.com/articles/excerpt.pdf

        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------

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ceengland(at)bellsouth.ne
Guest

Posted: Wed Sep 02, 2009 5:35 pm Post subject: rigging a thermocouple on a certified plane

Robert L. Nuckolls, III wrote:

 	  Quote: 	

 <nuckolls.bob(at)aeroelectric.com>

 At 12:07 PM 9/2/2009, you wrote:

> 

> <mprather(at)spro.net>

>

> Here's a dedicated K-type meter:

>

> http://www.virtualvillage.com/digital-thermometer-for-k-type-thermocouples/sku003920-016 

> If the above wraps, try this:

>

> http://tinyurl.com/kloqam

   Yeah, that works too. You can rig a 2-pole, 4-position

   rotary switch to "scan" the 4 probes for comparison.

   See:

 http://www.aeroelectric.com/articles/excerpt.pdf

        Bob . . . 

What I found even more interesting is the list of available probes, 

including

http://www.virtualvillage.com/k-type-thermocouple-temperature-sensor-probe-10ft-3m/sku003820-032

good to 800 degrees C.

Any thoughts on adapting this as an EGT probe? I like $5.99 a lot better 

than $30-$40 for a purpose-built aviation probe. Also, I wonder if it 

would be suitable for CHT in the 250-450 F range (120-260C) with a meter 

that's compatible with a K series probe.

Charlie

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