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CHT/EGT instrument wire?

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nuckollsr(at)cox.net
Guest

Posted: Tue Oct 24, 2006 9:29 am Post subject: CHT/EGT instrument wire?

I working on a panel upgrade on an RV-4 I bought several years ago. The 

EGT/CHT cables are too short, I want to replace the existing cable to get 

correct length. But I can't seem to find the same cable used to wire it. 

Here are the markings: Clear Signal Cable from Inmac Santa Clara,CA 95054 

E57891 Type CL2 90C 24AWG (UL) LL33523 CSA AWM A/B 80C 300V FT 4. Cable is 

shielded w/ blue casing, it has 6 wires 

(red,green,yellow,orange,brown,black). Two cables are used, one ea from 2 

terminal blocks mounted on the firewall. Do you know where I can buy this 

stuff...need about 8 ft.

   Are these cables that run through the firewall bring

   your EGT/CHT signals from the engine into the display?



   The stuff you mention can't be thermocouple wire and

   is not suitable to this task. I'm wondering if the

   original builder did a poor-choice extension of the

   wires.



   What EGT/CHT instrument are we talking about? Do you

   have the installation manual for it?

        Bob . . .

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

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

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

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nuckollsr(at)cox.net
Guest

Posted: Wed Oct 25, 2006 7:31 pm Post subject: CHT/EGT instrument wire?

 	  Quote: 	
		  These cables bring the EGT/CHT signals to the Dynon FlightDEK D-180 from two

terminal blocks(ring terminals used at blocks) and I also have the manual. A

Rocky Mt. MicroMonitor was originally used to monitor engine functions.



About the cable used I suspect it was some overkill. The original builder

was an Electrical Engineer and was very meticulous about everything.



I was looking for this type cable so that I could simply replace his

original installation but with more length...thought I could do that more

easily.


	


 	  Quote: 	
		  If there is a better way....what would you suggest?


	


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



Okay, I checked the wiring diagram for the FlightDEK_D-180 at:



http://tinyurl.com/y69fr6



  . . . where on page 2-6 we see a clear intention

on the part of Dynon that wires from the various EGT/CHT thermocouples

be run as contiguous thermocouple wire from the engine all the way to

the 25-Pin EMS connector on the rear of the panel mounted unit. This

is the right way to treat thermocouple wires.  As a review, I'll

recommend you get a copy of:



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



You can order thermocouple wire that matches the engine sensors

(type J and type K wire) from



http://www.ethermocouple.com/ppt/ppttc_XC_J_TC_WIRE.asp



and



http://www.ethermocouple.com/ppt/ppttc_XC_K_TC_WIRE.asp



There's a "part number builder" feature on each of these

pages. May I recommend the TT-J-20S and TT-K-20S wires

as the easiest to use. You can order 25' lengths of these

wires for about $1.00/ft.



Also, consider using machined male D-sub pins like the S604P

devices shown at:



http://www.aeroelectric.com/Pictures/Connectors/s604.jpg



http://www.aeroelectric.com/Pictures/Connectors/RCT-3_Male.jpg

and applied with a low cost tool like



http://www.aeroelectric.com/Pictures/Tools/Crimp_Tools/rct-3.jpg



Pins and tools available from either Steinair at:



http://steinair.com/



or B&C at



http://bandc.biz



Using the multi-conductor copper cables to extend your

engine thermocouples from a terminal block is a good way

to introduce considerable temperature measurement error

into the instrument's readings.

        Bob . . .

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

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

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

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Speedy11(at)aol.com
Guest

Posted: Thu Oct 26, 2006 4:38 pm Post subject: CHT/EGT instrument wire?

Bob,

 This was superb info!  This is why people come to this forum.

 It's worth putting up with the other "stuff" in order to mine nuggets like this.

 Stan Sutterfield

 Do not archive

  

  	  Quote: 	
		  Okay, I checked the wiring diagram for the FlightDEK_D-180 at:



http://tinyurl.com/y69fr6



  . . . where on page 2-6 we see a clear intention

on the part of Dynon that wires from the various EGT/CHT thermocouples

be run as contiguous thermocouple wire from the engine all the way to

the 25-Pin EMS connector on the rear of the panel mounted unit. This

is the right way to treat thermocouple wires.  As a review, I'll

recommend you get a copy of:



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



You can order thermocouple wire that matches the engine sensors

(type J and type K wire) from



http://www.ethermocouple.com/ppt/ppttc_XC_J_TC_WIRE.asp



and



http://www.ethermocouple.com/ppt/ppttc_XC_K_TC_WIRE.asp



There's a "part number builder" feature on each of these

pages. May I recommend the TT-J-20S and TT-K-20S wires

as the easiest to use. You can order 25' lengths of these

wires for about $1.00/ft.



Also, consider using machined male D-sub pins like the S604P

devices shown at:



http://www.aeroelectric.com/Pictures/Connectors/s604.jpg



http://www.aeroelectric.com/Pictures/Connectors/RCT-3_Male.jpg

and applied with a low cost tool like



http://www.aeroelectric.com/Pictures/Tools/Crimp_Tools/rct-3.jpg



Pins and tools available from either Steinair at:



http://steinair.com/



or B&C at



http://bandc.biz



Using the multi-conductor copper cables to extend your

engine thermocouples from a terminal block is a good way

to introduce considerable temperature measurement error

into the instrument's readings. 	


 

  [quote][b]

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nuckollsr(at)cox.net
Guest

Posted: Thu Oct 26, 2006 5:49 pm Post subject: CHT/EGT instrument wire?

At 08:36 PM 10/26/2006 -0400, you wrote:



 	  Quote: 	
		  Bob,

This was superb info!  This is why people come to this forum.

It's worth putting up with the other "stuff" in order to mine nuggets like 

this.

Stan Sutterfield


	


   Thank you. It's my reason for being here. It's also offered

   as an example of what we should all strive for in being

   useful participants on the List.  This illustrates why it's

   important that we not have to "mine" nuggets from a pile of

   tailings.



   If you invest the $time$ to occupy a seat in a classroom,

   you EXPECT to get your $times$ worth without having to sift

   for gems amongst mud and gravel. I can see no downside

   to striving for that same kind of atmosphere here on the

   List. I.e, gravel and mud throwers are not needed or welcome.



   Bob . . .



   Do not archive

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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