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EI vs JPI
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az_gila

Joined: 17 Jun 2006
Posts: 99
Location: Tucson, AZ

Posted: Mon Mar 30, 2009 11:34 am Post subject: EI vs JPI

Into the mix but a completely different type of sensor.



 No thermocouples here - it's either a resistive sensor, or a semiconductor junction type sensor.



 Apples and Oranges....    gilA



 At 10:43 AM 3/30/2009, you wrote:

 [quote]Just to add to the mix. Â  



 On the flight tests, we also measured Oil Temp and OAT with the EI. Â Oil temp was measured at the oil filter adaptor and OAT was a probe stuck out the canopy at the top. Â  



 Oil temp on the EI was within 5 degrees of the oil temp measured by the JPI in the front right galley plug.



 Oat on the JPI was slightly colder, 1 to 4 degrees, with the JPI probed located under the left wing at the most forward inspection cover.



 

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az_gila

Joined: 17 Jun 2006
Posts: 99
Location: Tucson, AZ

Posted: Mon Mar 30, 2009 6:01 pm Post subject: Re: EI vs JPI

OK... now the point of discussion has morphed a bit.



I thought it was "Bayonet probes vs. short, fixed probes" for CHTs.



It seems to be now "JPI reads higher than EI" - which is quite a different issue.



This gets into the electronic circuits used and how the manufacturers calibrate their equipment.



gil A - a little confused...

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GOLDPILOT(at)aol.com
Guest

Posted: Tue Mar 31, 2009 9:06 am Post subject: EI vs JPI

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                             TeamGrumman-List Digest Archive

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                      Total Messages Posted Mon 03/30/09:  10

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Today's  Message Index:

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



     1. 06:49 AM  - Re: Re: EI vs JPI  (flyv35b)

     2. 07:21 AM - EI vs  JPI  (Thomas Campbell)

     3. 07:48 AM - Re: EI vs  JPI  (flyv35b)

     4. 09:42 AM - Re: reciting thread  posts  (923te)

     5. 10:27 AM - Re: Re: EI vs JPI   (teamgrumman(at)aol.com)

     6. 10:46 AM - Re: Re: EI vs  JPI  (teamgrumman(at)aol.com)

     7. 11:32 AM - Re: Re: EI  vs JPI  (teamgrumman(at)AOL.COM)

     8. 12:34 PM - Re: Re:  EI vs JPI  (Gil Alexander)

     9. 01:39 PM - Re:  reciting thread posts  (grumpyparts)

    10. 07:02 PM - Re: EI  vs JPI  (az_gila)



________________________________   Message 1  _____________________________________

Time: 06:49:50  AM PST US

From: "flyv35b" <flyv35b(at)minetfiber.com>

Subject: Re:  RE:  EI vs JPI



This has been my point, there is  very little difference between the two 

types of probes.  If I recall  this data from Steve was obtained on 

different flights so the 3.5F is  probably within the margin of error.  

We don't have all the data or  evidence yet and the jury is still out.



Cliff

  ----- Original  Message ----- 

  From: 923te 

  To:  teamgrumman-list(at)matronics.com 

  Sent: Sunday, March 29, 2009 7:48  PM

  Subject: Re: RE: EI vs JPI

   Steve's conclusion "the EI longer P-101 probe does indeed read hotter 

than  the short P-100 probe by about 3.5 degrees F"

    ----- Original  Message ----- 

    From: flyv35b 

    To:  teamgrumman-list(at)matronics.com 

    Sent: Sunday, March 29, 2009  9:35 PM

    Subject: Re: RE: EI vs  JPI

    Maybe you guys need to ask Steve Peach about the  two different 

styles of EI probes, bayonet and standard P-100, that he  tested and 

found very little difference between the two.  The large  differences in 

temperature mentioned are between JPI with the bayonet and EI  with the 

fixed probe.  And all the accusations, or implications at  least, are 

that the fixed EI probe does not measure the true  temperature.  There is 

a real possibility that it could be due to  something completely 

different.



    Cliff

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