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Thermo-Couples through pressure bulkhead

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schaefer(at)rts-services.
Guest

Posted: Wed Nov 14, 2007 9:55 am Post subject: Thermo-Couples through pressure bulkhead

Folks,  

   What is the effect of running EGT, and CHT thermocouples through a bulkhead connector?   

I believe these are all “K” type thermo couples and I believe that if they are extended need to be done  

with thermo couple wire. But can I have a connector with gold contacts joining two pieces of thermo couple wire?  

   

r.t.s.  

   

Richard T. Schaefer      E-mail: schaefer(at)RTS-Services.com (schaefer(at)RTS-Services.com)  

RTS Services Inc          Web: http://www.RTS-Services.com  

7330 Cave Hollow         ___        Voice:  (512) 923-2755

 Austin,  TX 78750          |         Fax:    (830) 798-9644

                `---------(*)---------'  

   

   

       [quote][b]

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ainut(at)hiwaay.net
Guest

Posted: Wed Nov 14, 2007 12:33 pm Post subject: Thermo-Couples through pressure bulkhead

Not if you can help it.  Try your best to use the TC  wire and ground in one solid strand from the sensor to the instrument, if at all  possible.  You'll vastly improve your error rate that way.

  

 David M.

  

  

 [quote]   ---

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nuckolls.bob(at)cox.net
Guest

Posted: Wed Nov 14, 2007 12:47 pm Post subject: Thermo-Couples through pressure bulkhead

I've run stranded and solid thermocouples through

ordinary machined pins in connectors with insignificant

effects on accuracy. While connector pins of material

"foreign" to the thermocouple wire alloy is inserted

into the Seebeck signal path and while each new joint

introduces error, the joints are paired in opposite

polarities and over the small space of a connector

mass, are very close in temperature to each other.



I'd recommend using a connector that puts a 4-quadrant

crimp on machined metal pins

http://www.aeroelectric.com/Pictures/Connectors/D-Subminature/D-Sub_Machined_Pins.jpg



http://www.aeroelectric.com/Pictures/Connectors/D-Subminature/D-Sub_4-quad-crimp.jpg



as opposed to soldering or using sheet metal, b-crimp pins.



     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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