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                           AeroElectric-List Digest Archive
                                      ---
                     Total Messages Posted Fri 11/21/08: 3
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Today's Message Index:
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     1. 05:08 AM - Thermocouples connected to Dynon EGT CHT  (Sam Hoskins)
     2. 09:00 AM - Re: Thermocouples connected to Dynon EGT CHT  (rampil)
     3. 09:05 AM - Re: Thermocouples connected to Dynon EGT CHT  (ROGER & JEAN CURTIS)
 
 
 
________________________________  Message 1  _____________________________________


Time: 05:08:36 AM PST US
From: "Sam Hoskins" <sam.hoskins@gmail.com>
Subject: AeroElectric-List: Thermocouples connected to Dynon EGT CHT

Please help me work through this.

1.  I am reusing my old Westach EGT/CHT thermocouples, type J & K.  They
appear to be shielded and have 48" leads and will need new terminals.
2.  I have a pre-fab TC harness from Stein Air (for Dynon), which is made
from a non-copper wire.  It seems to be pretty stiff.  The EGT lead wires,
under the sheath, are rust/yellow.  The CHT wires are rust/white.  This
harness wire is way too long and needs to be shortened.

My questions are:

A.  Due to the crazy airframe, it is not uncommon to pull the engine at
annual inspection time.  What would be the best connector to use?  Could I
use a D-sub? The connection to the D180 is a 25 pin D-sub.
B.  For temperature accuracy purposes, would it be better to position the
connector forward or aft of the firewall?  The most convienient would be
forward.

Thanks, in advance.

Sam
www.samhoskins.blogspot.com

________________________________  Message 2  _____________________________________


Time: 09:00:04 AM PST US
Subject: AeroElectric-List: Re: Thermocouples connected to Dynon EGT CHT
From: "rampil" <ira.rampil@gmail.com>


Hi Sam,

If you are talking about a connector on the firewall, use a metal
circular connector i.e., AMP. Do not use a a db submini for three
reasons: They are not deep enough to pass through most firewalls,
they provide no thermal insulation and are not rated for constant hi temp environment,
and they are not gas tight against carbon monoxide etc.

AMP makes special pins for TC connections, but I have never seen
anyone ever use them.  Just live with the relatively tiny errors due to
the extra junction

--------
Ira N224XS


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=215559#215559


________________________________  Message 3  _____________________________________


Time: 09:05:49 AM PST US
From: "ROGER &  JEAN CURTIS" <mrspudandcompany@verizon.net>
Subject: RE: AeroElectric-List: Thermocouples connected to Dynon EGT CHT

My questions are:


A.  Due to the crazy airframe, it is not uncommon to pull the engine at
annual inspection time.  What would be the best connector to use?  Could 
I
use a D-sub? The connection to the D180 is a 25 pin D-sub.


B.  For temperature accuracy purposes, would it be better to position 
the
connector forward or aft of the firewall?  The most convienient would be
forward.


Thanks, in advance.


Sam


               The 25 pin d-sub is a good choice.  Use the ones with the
crimped pins, since soldering of thermocouple wires is not recommended.

   You can use these forward of the firewall with very little 
degradation of
accuracy.  The important thing with using a nonthermocouple material
connector is that both sides of the connector should be at the same
temperature, otherwise greater error will be introduced.

Roger

 

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