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 Post subject: thermocouples
 Post Posted: Thu Aug 28, 2008 5:49 pm 
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Location: Longview, Tx
What kind of thermocouples are ya'll using in the way of type of element?  I used the exposed element on my last one, but it had a very short lifespan.  I'm looking at the grounded elements, that have the protective sheath over them with the element in contact with it on the inside.  My only concern is if there is a delay in the element reading at actual egt's due to having to heat up the sheath first, therefore not picking up the high temp before letting off the gas?  Is this a viable concern?

Here's the one I'm looking at...
http://www.omega.com/ppt/pptsc.asp?ref=TC-NPT

-Tanner

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 Post Posted: Thu Aug 28, 2008 6:48 pm 
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I don't think that would work well on a race application. If you're planning on putting it in the primary tube near the exhaust port (where it should be) just the size of it would keep me from using it. The thread is 1/4 pipe and the probe is 1/4" diameter. That's going to be kind of bulky and I would think somewhat obstructive.  The ones I use in mine are the exposed tip 1/8 diameter and they use a 1/8 pipe thread adapter.  My thermocouples are the same ones I put in it in 2006 and I haven't had any trouble with them.

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 Post Posted: Thu Aug 28, 2008 6:49 pm 
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Tanner, From talking to computech they tell me that for a drag car you need one that cycles at least 5 times a second O:) ..there new ones cycle 7 times a second to give you the best at the end of the quarter....

PM Chuck he's a dealer for them............Barry

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 Post Posted: Thu Aug 28, 2008 7:17 pm 
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So what determines its cycle rate?  The element itself, or the reader?

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 Post Posted: Thu Aug 28, 2008 7:32 pm 
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Tanner wrote:
So what determines its cycle rate?  The element itself, or the reader?


The reader determines the cycle rate.  

I'm with Chuck on the size but what I use is an exposed tip with a SS hose clamp that mounts it on the pipe, not a weld in bung.  There's one eight inch hole in mine and the probe fits right in there.

The ones I got for mine came from Aircraft Spruce and are the K type.  If memory serves, I paid like $38 each for'em then had to buy the extension wire to get them connected to the Innovate logger.  You don't have to buy but a couple of the extension kits though as they are pretty long and can do multiple thermocouples.

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 Post Posted: Thu Aug 28, 2008 7:37 pm 
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Then I wonder what made my exposed element go south?  Worked fine for what I needed, while it worked.  But now it's just receiving an error signal.

-Tanner

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