REFLECTOR:CHT & EGT EXTENSIONS

Mon, 16 Feb 2004 22:01:04 -0700

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I have since checked with the manufacturer of my probes.  They say any
wire will do ... that's because they are "resistive" type probes.  They
say for the "thermocouple" type sensors I would need exact material ...
in other words OEM leads.
=20
=20
-----Original Message-----
From: Jim Sower [mailto:canarder@frontiernet.net]=20
Sent: Monday, February 16, 2004 9:52 PM
To: reflector@tvbf.org
Subject: Re: REFLECTOR:CHT & EGT EXTENSIONS
=20
It WILL introduce and error in the readings.  I am told that the
magnitude of the error is roughly the temp difference between where the
"trick" wire joins the "standard" wire and where the standard wire ties
to the instrument.  So if you make that junction in the cabin where
joint temp is within 15-10 deg of the instrument temp, the error will be
15-20 deg.  Trivial for EGT, manageable for CHT.=20
That's the rumor I heard - YMMV .... Jim S.=20
Tom Martino wrote:=20
	Does anyone know if it matters if I used good aircraft grade
wire to extend the leads on CHT and EGT probes? Or is it necessary to
use the high-priced leads that the instrument makers sell?
--=20
Jim Sower ... Destiny's Plaything=20
Crossville, TN; Chapter 5=20
Long-EZ N83RT, Velocity N4095T=20
 =20

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I have since checked with the =
manufacturer
of my probes. &nbsp;They say any =
wire will do
... that&#8217;s because they are &#8220;resistive&#8221; type =
probes.&nbsp; They say for the =
&#8220;thermocouple&#8221;
type sensors I would need exact material ... in other words OEM =
leads.<o:p></o:p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<div>

<p class=3DMsoNormal><font size=3D3 color=3Dnavy face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt;color:navy;mso-no-proof:yes'>&nbsp;</span></fon=
t><o:p></o:p></p>

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<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> Jim Sower
[mailto:canarder@frontiernet.net<span class=3DGramE>] <br>
<b><span style=3D'font-weight:bold'>Sent</span></b></span><b><span
style=3D'font-weight:bold'>:</span></b> Monday, February 16, 2004 9:52 =
PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
reflector@tvbf.org<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Re: =
REFLECTOR<span
class=3DGramE>:CHT</span> &amp; EGT EXTENSIONS</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'><o:p>&nbsp;</o:p></span></font></p>

It WILL introduce and error in the =
readings.&nbsp; I
am told that the magnitude of the error is roughly the temp difference =
between
where the &quot;trick&quot; wire joins the &quot;standard&quot; wire and =
where
the standard wire ties to the instrument.&nbsp; So if you make that =
junction in
the cabin where joint temp is within 15-10 deg of the instrument temp, =
the
error will be 15-20 deg.&nbsp; Trivial for EGT, manageable for CHT. 
That's the rumor I heard - YMMV .... Jim S. =
<o:p></o:p>

<p style=3D'margin-left:.5in'><font size=3D3 face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt'>Tom Martino wrote: =
<o:p></o:p></span></font></p>

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<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Does anyone know if it =
matters if I
used good aircraft grade wire to extend the leads on CHT and EGT
probes?&nbsp;Or is it necessary to use the high-priced leads that the
instrument makers sell?<u3:p></u3:p></span></font><o:p></o:p></p>

</div>

</blockquote>

<p style=3D'margin-left:.5in'><u3:p></u3:p><font size=3D3 face=3D"Times =
New Roman"><span
style=3D'font-size:12.0pt'><u3:p></u3:p><u3:p></u3:p>-- <br>
Jim Sower ... Destiny's Plaything <br>
Crossville, TN; Chapter 5 <br>
Long-EZ N83RT, Velocity N4095T <br>
&nbsp; <o:p></o:p></span></font></p>

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